Robin Lieberman, President of the NJ based Fastener and Electronic hardware supplier MF Supply, is one of 17 business leaders selected to the SBA Emerging Leaders Program for the NJ class of 2015. The program had its kickoff meeting and first class on April 14, 2015 at Rutgers Business School in Newark. The seven month program runs through the end of October.

The SBA Emerging Leaders Program is a federal training initiative that specifically focuses on executives of businesses poised for growth. Since its inception, the program has helped more than 2,000 small business owners grow their businesses. Graduates of the program have shown significant growth with over 1940 new full-time employees and over $20 million in new financing. In addition, participants have secured federal, state, local and tribal contracts cumulatively worth nearly $300 million. The program's comprehensive curriculum provides the tools to catapult companies to the next level and help them emerge as a force in their community.

Ms. Lieberman says, "I appreciate the opportunity to be included in this very successful proven program. I'm excited to learn how to better leverage MF Supply's assets, including our NJ Women Owned Business Certification, to potentially secure government work. Moreover, one of our main goals is the expansion of our products and services and the growth of our client base. We're confident that the training, resources and exposure we get from participation in the Emerging Leaders program will lead to more manufacturers becoming aware of MF Supply and our unique approach to supply chain operations."

With New Jersey long known for a strong industrial base for aerospace, shipbuilding, chemical manufacturing, agriculture, pharmaceuticals and petro chemicals, this positions Lodi based MF Supply strategically to continue serving this growing industrial market.

To learn more about MF Supply, call 973-777-5411.
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Newsletter

Volume 11

October 30, 2014

What the heck are Set Screws?

Set Screws

We begin the fourth quarter of 2014 with an introduction to the Set Screw. A Set Screw is a headless screw (appropriate for our Halloween edition) fully threaded from end to end. Traditionally classified within the Socket family of products, Set Screws are comprised of 3 main parts: the drive, the thread and the point. They (generally) have a hexagonal drive on one end, and a point on the other. They are often used in conjunction with a shaft collar, and like their functional relatives, the Dowel Pin, Retaining Ring and Shoulder Screw, they are used as part of an assembly (you should be getting used to reading about assemblies by now :)).

Who uses Set Screws?

Set screws are used in many industrial and mechanical devices, particularly within assemblies with rotating items such as pulleys or wheels where a component is locked onto a shaft. Designed to fasten one object inside another, set screws pass right through a threaded hole in the outer object and are tightened against the inner object. Pretty cool, right?

The set screw works by exerting compressional force through the tip to prevent the relative movement between the two objects so each part can function as intended. This is different than traditional screws that hold objects together with threads. Who would have thunk that a headless screw could have so much power!

What options are available?

Like most fastening products, the bevy of options is plentiful (and sometimes exhausting if you ask me!). Once the basics like the diameter, thread, length and material are determined, the main decisions that need to be made are the drive and point style.

Drives

The most common and readily available drive style is a hexagonal socket drive (think allen wrench), however, set screws may also be available in slotted, six-lobe (torx) and spline drives for certain sizes.

Points

This is where it gets interesting. The point of the set screw determines its function. There are 7 (yes 7!) main points that are available, and each serves a slightly different purpose.

1. Cup-the most common style, which is slightly cupped to meet the surface of the inner object. Used for permanent or semi-permanent installations, the Cup point provides a high level of security and control. (Metric DIN 916)

2. Knurled Cup-a variation of the Cup point, this style has knurls for a stronger grip.

3. Cone- a very sharp point wedges into the inner object to hold it in place permanently. With the highest holding power of all set screw styles, the Cone point is used for permanent settings. Note: Cone point set screws may cause damage to the inner object which might not be desirable in some applications. (DIN 914)

4. Flat-designed for flexibility when frequently resetting or relocating objects on hard steel shafts where minimal damage to shaft is necessary. Affordable and easy to install, Flat point set screws can be moved without damaging the inner object. (DIN 913)

5. Oval-its point is the inverse of the cup point. The small rounded contact surface allows slight adjustments without loosening the screw, and causes minimal surface damage to inner object. The Oval point set screw is the most practical type for situations where the inner and outer objects require regular adjustments.

6. Half-dog-sometimes offered as a full Dog point, its protruding tip locks within a mating hole or slot in the shaft, for permanent setting. Half dog/Dog points are sometimes used instead of a dowel pin. (DIN 915)

7. Nylon tip - resembling a Half dog point, the soft nylon tip is used to grip curved or textured surfaces.

Are there other factors to consider?

From what you've just read, it appears that the choices are abundant, yet, in practice, many of the combinations that engineers are seeking are only available as specials and have to be custom made. For example, if you are looking for a fine thread cone point set screw in stainless steel, you may be told it has to be custom made with a minimum run and a long lead time. Make sure to check with our sourcing experts first before you change your requirements!

So, you might be wondering how to get what you need and get it fast? In our experience, Set screws are most commonly available in sizes 2-56 through 1" in imperial and M2-M24 in metric diameters with a hex socket drive on one end and a cup point on the other. The most common material is hardened alloy steel with a thermal black oxide finish, as per ASME B18.3. Socket set screws come standard with 3A thread fit and a Rockwell hardness of C45-53.

Commercial, Mil-Spec or Brand name?

Finally, Set Screws can also show up under their most popular domestic brand name (Holo-krome) or their Mil-spec numbers, which are DFARS compliant with full paperwork. AN565, NAS1081, MS18063, MS18064, MS18065, MS18066, MS18067, MS18068, MS21342, MS51017, MS51021, MS51022, MS51023, MS51025, MS51026, MS51029, MS51031, MS51033,MS51038, MS51040, MS51045, MS51047, MS51053, MS51476, MS51477, MS51963, MS51964, MS51965, MS51966, MS51973,MS51974, MS51976, MS51977, MS51981, MS51982.

Set Screws Available at MF Supply:

Here at MF Supply, we offer:

The full range of commercial and mil-spec parts, including parts that are DFARS and ROHS compliant.

Brand names (Holo-krome) and generic equivalents.

Custom made parts per print in non-standard and exotic materials and finishes.

Inch and Metric sizes.

For more detailed information on Set Screws, visit us at http://www.mfsupply.com/category_s/1914.htm.

Newsletter

Volume 8

July 23, 2014

What the heck are Precision Shoulder Screw

Precision Shoulder Screws

Here we go again, with our "what the heck is that" series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. Today, we will introduce you to the Shoulder Screw.

What is a Precision Shoulder Screw?

Shoulder Screws, which are sometimes called Shoulder Bolts or Stripper Bolts, are (generally) hex socket screws with an enlarged, unthreaded cylindrical shoulder under the head. They are comprised of 3 main parts: the head, the shoulder and the thread. They come in two basic categories, “Commercial” and “Precision”.

Commercial Shoulder Screws are made to inch standard ANSI ASME B18.8.2. The size range for the shoulder diameter is from ¼ to 2”. The thread class is 3A and the tolerance on the shoulder is +.005 / -.005.

Precision Shoulder screws are sometimes referred to as “tight tolerance” shoulder screws. They are not governed by any official ANSI or ASME standard. The size range for the shoulder diameter is from 3/32 to ½. The thread class is 2A and the tolerance on the shoulder diameter varies from +.000/-.001 to -.0005 to -.0015 depending upon the manufacturer. Now that’s precise!

Who uses Shoulder Screws?

Just as Dowel Pins and Retaining Rings are used to locate or hold parts together within a precision assembly or a fixture, so are Precision Shoulder Screws.

Yet shoulder screws are more versatile. When installed, the unthreaded shoulder acts as a shaft for rotating items such as bearings and bushings, precision spacing, machinery support, and motion guiding. Precision Shoulder screws exacting tolerances make them ideal for use with other precision components.

They are broadly used across various applications in many industries, including: aerospace, electrical motors, hydraulic equipment, instrumentation, tooling and fixtures, machinery, military and many more.

What do I need to consider when selecting Shoulder Screws?

Although Shoulder Screws are offered in a multitude of materials and styles, when it comes to the main commercial and precision offerings, there are a few main issues to consider.

Which Drive and Head Style?

Precision shoulder screws are readily available in hex socket and slotted drives. Philips drives are available in certain sizes. Torx and Star are available for special order. Typical head styles are a modified fillister with a flat top where the head diameter is about twice the head height. Low head fillisters are available in certain sizes

Which material do I need?

Precision shoulder bolts are readily available in Type 18-8/303 Stainless Steel and 416 Stainless Steel. 316 Stainless Steel, Alloy and other exotic materials are available for special order.

Are there other factors to consider?

When ordering Precision Shoulder screws, specify the Shoulder Diameter, Shoulder length, thread size, material and drive type. For example, an example of a typical Precision Shoulder screw is a ¼ shoulder x ½ long x 10-32 thread in SS18-8 with a hex-socket drive. Non-locking is the most popular style, but locking may also be available.

Precision Shoulder Bolts often show up under their brand name. Some of the most popular brands include: BERG, Concord, Globe, PIC, Lyn-tron and RAF. A comprehensive selection of Shoulder Screws is also offered by McMaster-Carr (tight tolerance series), MSC and Grainger.

Finally, Precision Shoulder Screws can also show up under their Mil-spec numbers, which include MS51575 & MS51576 and are DFARS compliant with full paperwork.

Precision Shoulder Screws at MF Supply

We offer:

• The full range of commercial and mil-spec parts, including parts that are DFARS and ROHS compliant.
• Brand names and generic equivalents.
• Custom made parts per print in non-standard and exotic materials and finishes.
• Inch and Metric sizes.

For more detailed information on Precision Shoulder Screws, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=1922

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Newsletter
Volume 7

June 19, 2014

What the heck are Dowel Pins?

Dowel Pins

Welcome back to our "what the heck is that" series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. Today, we will introduce you to the Dowel Pin.

What is a Dowel Pin?

If you have ever shopped at Ikea or assembled furniture on your own, then you are familiar with the peg shaped non-threaded wooden pins that are used to join parts together, aka as a Dowel Pin.

For the purposes of manufacturing, Dowel Pins are solid, headless cylindrical shaped straight metal pins with a centerless ground finish. Typically hardened and manufactured to precise fractional diameters and lengths, Dowel Pins come in a variety of sizes, styles, designs and materials that cause confusion among buyers, engineers and end-users alike! Today, we will try simplify this confusing category of fasteners.

Who uses Dowel Pins?

Dowel Pins are used as a hinge, shaft or pivot to locate or hold parts together within a precision assembly or a fixture.

They are broadly used across various applications in many industries, including: aerospace, electrical motors, hydraulic equipment, instrumentation, tooling and fixtures, machinery, military and many more.

Dowel Pins are popular within assemblies since they can withstand frequent insertion and removal without distortion. And production favors pins since they require no extra fastening hardware for insertion, no secondary operations and no mating parts. All this adds up to speedier production, which makes everyone in the food chain happy!

What do I need to consider when selecting Dowel Pins?

Although Dowel Pins are offered in a multitude of materials and styles, when it comes to the main commercial and Mil-spec offerings, there are a few main issues to consider.

Standard, Oversized or Undersized?

Standard series Dowel Pins are used for initial applications. They have a basic diameter 0.0002 inch over the nominal diameter. For example, a ¼ standard dowel will have a diameter between .2501-.2503.

Oversized series Dowel Pins are usually used to fit into worn holes and are generally used in the aftermarket for repairs. They have a basic diameter 0.001 inch over the nominal diameter. For example, a ¼ oversized dowel will have a diameter between .2509-.2511.

Undersized series Dowel Pins are used for inconsistent holes. They have a basic diameter -0.0002 inch under the nominal diameter. For example, a ¼ undersized dowel will have a diameter between .2500-.2498. The Mil-P-21143/2- falls into the undersized category.

Chamfer or radius on the end?

In general, commercial pins are made to inch standard ANSI ASME B18.8.2. Standard alloy pins will have a radius on one end and a chamfer on the other end. However, stainless steel Dowel Pins are often manufactured with a chamfer on both ends.

Commercial or Military?

If you or your customer needs domestically made, DFARs pins to the most exacting standards, then military may be the right pin for you!

Alloy or stainless? And which stainless for that matter?

Alloy Steel is the strongest pin available and is hardened. It can be finished with Black Oxide to provide greater rust resistance than plain alloy.

Type 416 Stainless steel is the strongest standard stainless steel offering, and is the material used for MS16555 and MS16556 series. Magnetic.

Type 18-8/303 Stainless Steel is the most commonly available stainless offered and is the standard material offered for Mil-P- 21143 series.

Type 316 Stainless Steel is the most corrosion resistant stainless available and does not correlate to a Mil-spec part.

Are there other factors to consider?

Dowel Pins often show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series for Dowel Pins include Mil-P-21143 (303 Stainless), MS16555 (standard series offered in both alloy and 416 Stainless Steel) and MS16556 (oversized series offered in both alloy and 416 stainless steel).

If you are not ordering by an MS or NAS Mil-Spec part number, then inch Dowel Pins conform to ANSI/ASME B18.8.2. For commercial pins, be mindful to specify the material and size tolerance that you need. Unless noted, Dowel Pins are precision ground, hardened and heat treated to meet the proper Rockwell hardness.

And remember, no hammers! When installing Dowel Pins, never drive the pin into the hole with force, always press it in for best results.

Dowel Pins at MF Supply

We offer:

The full range of commercial and mil-spec parts, including parts that are DFARS and ROHS compliant.

Brand names and generic equivalents.

Custom made parts per print in non-standard and exotic materials and finishes.

Inch and Metric sizes including DIN 7, DIN 6325, and ISO 2338 and 8734

For more detailed information on Dowel Pins, visit us at http://www.mfsupply.com/dowel_pins_s/1925.htm

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Newsletter

Volume 6

May 13, 2014

What the Heck are Retaining Rings?

Welcome back to our "what the heck is that" series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. Today, we will introduce you to the Retaining Ring.

What is a Retaining Ring?

Retaining Rings are yet another way to position, locate and retain parts within an assembly. Shaped like an open ring and made of metal, Retaining Rings can be coiled from wire, stamped or laser cut. They come in a variety of styles and materials, each solving a unique fastening problem.

Generally, Retaining Rings work together with a bore or a shaft by snapping into a groove or being pushed into place to create a high strength shoulder to retain parts.

AKA - Also known as.....

The Retaining Ring is a funny little guy and answers to a bunch of different names - some of Retaining Ring's favorite aliases are: snap rings, wire rings, circlips, retainer clips, spiral rings, wire clips, c-rings, grip rings, klip rings and push-on rings.

Who uses Retaining Rings?

Any application with a bore/housing or shaft that requires a shoulder to keep parts in place within an assembly is a candidate for using Retaining Rings.

Retaining Rings are broadly used across various applications in many industries, including: aerospace, drive shafts, electrical motors, hydraulic equipment, instrumentation, lighting assemblies, machinery, nuclear equipment and many more. Retaining Rings are very common in the automotive industry.

Why use a Retaining Ring vs. a screw or a bolt?

When a shaft or bore design that includes assembled components needs a shoulder, it can be costly to machine the shoulder, mate threaded components and fasteners together and drill and coordinate threaded holes and access holes to fasten the assembly. Retaining Rings can serve as a cost effective and time saving alternative.

In addition to cost, Retaining Rings offer 2 special benefits a) they can be more resilient than screw assemblies in high vibration environments, b) they are made from less material, hence they are cleaner and gentler on the environment (aka Green!).

Check out this video:

http://machinedesign.com/manufacturing-equipment/r...

Are there other factors to consider?

As discussed, Retaining Rings are often referred to by their brand names, which can often be substituted by generic equivalents. Popular brands include: Anderton, Rotor Clip, S&M and Waldes/Truarc. We can supply the brand name or generic alternatives. Note: Currently, Rotor Clip (Waldes/Truarc) and S&M are the only full-line USA manufacturers.

Retaining Rings often show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series for Retaining Rings include: MS16624, MS16625, MS16626, MS16627, MS16628, MS16629, MS16630, MS16631, MS16632, MS16633, MS3215, MS3217 and MS90707.

Sizes available vary based on the style. The general range is from 1/16 to 10". Metric sizes are also available.

Retaining Rings at MF Supply

We offer:

The full range of commercial and mil-spec parts, including parts that are DFARS and ROHS compliant.

Brand names and generic equivalents.

Custom made parts per print.

For more detailed information on Retaining Rings, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=182...

And if you don't see it listed, as always, ask us. Finding the right screw for you is our tag line after all!

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Newsletter

Volume 5

April 17, 2013

What the heck is a Keensert® Key-locking insert?

Key-locking insert

We close out the first quarter of 2013 by introducing you to the Keensert Key-locking insert. Like its relative, the Helical wire insert, (see January 2013), the Key-locking insert was originally designed to repair parts with damaged threads.

What is a Keensert Key-locking insert?

The Key-locking threaded insert is a solid bushing style insert that is threaded on both the inside and the outside, and has wedges or “keys” attached to the top of the insert. Keensert® is the registered trademark for one of the most popular brand names for this part and is used commonly to describe this insert.

Who uses Key-locking inserts?

Generally, Key-locking inserts are used to distribute loads and strengthen or repair threads against failures due to stripping, seizing or corrosion. Key-locking inserts are commonly used in high torque and high temperature situations, and in applications where fasteners may be repeatedly removed and reassembled.

Typical applications are transmission housings, electronic equipment and suspension units. Key-locking inserts are common in the aerospace industry.

Why use a Key-locking insert vs. a Helical wire insert?

There are three main differences between Key-locking inserts and Helical Wire Inserts: Key-locking inserts are stronger than helical wire inserts, they are easier to install than helicals, and they are more expensive!

In heavy wear, high vibration and high heat situations where saving space is not a concern and hole depth is limited, Key-locking inserts are the best bet. Their “keys”, which are driven down into the tapped threads, provide a mechanical lock against rotation, especially when the mating stud or bolt will be removed frequently.

When reducing costs and minimizing space are priorities, helical wire inserts are the way to go.

They are particularly useful for creating permanent strong threads in softer materials such as aluminum, titanium and magnesium alloys, and are best suited to lower heat and lower torque environments.

What styles are available?

Key-locking inserts come in four main styles: Miniature, Thin Wall, Heavy Duty Wall (general purpose) and Extra Heavy Duty. Inserts can be locking or non-locking.

Miniature Key-locking inserts are used in electronic and aerospace applications where size and strength are critical. These inserts may be installed in sheet material as thin as 1/16″.

Thinwall inserts have smaller external threads than standard heavy-duty inserts and are ideal for tight spaces where less pull-out strength is acceptable.

General-purpose Heavy Duty inserts have a thick, heavy-duty thread wall, suitable for most applications.

Extra-Heavy Duty inserts are used in oversized and overly worn holes.

Installation is 5 easy steps!

1) Drill with a standard tap drill and countersink with a standard 82° – 100° countersink (90° for Miniature Inserts). Note: Drill is oversize see charts for proper dimensions.

2) Tap new threads with a standard tap.

3) Screw in the insert until it is .010-.030 (.005-.015 for Miniature Inserts) below the surface. Keys locate the proper depth.

4) Drive keys down with several hammer taps on the proper installation tool.

5) You are done!

Considerations for selecting and using Key-locking inserts.

Inserts often show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series for Key-locking inserts include: MS5180, MS51831, MS51832, NAS1394, NAS1395, NA0146, NA0147, NA0148, NA0149, NA150, NA0151.

As discussed, Key-locking inserts are often referred to by their brand names, which can often be substituted by generic equivalents. Popular brands include: Alcoa, Fairchild, Keensert and Tridair.

Materials available include Carbon steel, Stainless Steel, Alloy 4140 and A286.

Diameters available: American – #6 to 1 1/2 ” and Metric – M4 to M24

Key-locking inserts at MF Supply

We offer:

The full range of commercial and mil-spec parts

Products kits including single and multiple sizes

We are authorized distributors for Chrislynn and E-Z Lok

For more detailed information on Key-locking insert, visit us athttp://www.mfsupply.com/Keensert_Style_Inserts_s/1864.htm

And if you don’t see it listed, as always, ask us. Finding the right screw for you is our tag line after all!

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Newsletter

Volume 4

February 27, 2013

What the heck are Standoffs and Spacers?

Male-Female Standoff

Welcome to our "what the heck is that" series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. Today, we will introduce you to Standoffs and Spacers.

What are Standoffs and Spacers?

According to the dictionary, a Standoff is defined as "a stalemate or a deadlock between two equally matched opponents." In the fastener world, Standoffs have a different meaning. They are commonly used to mechanically support and electrically connect and position components within assemblies. Spacers are similar to Standoffs, however, Standoffs are threaded on both ends, and spacers are unthreaded with an inside clearance hole.

Who uses Standoffs and Spacers?

In the world of electronic hardware and components, Standoffs and Spacers are the standard for connecting and mounting circuit boards, panels, doors and gears. Both are commonly used to properly position parts within an assembly, to reduce component contact, to elevate stacked sections, to ensure enough room for heat to dissipate and to separate or create space between two objects.

What styles are available?

Standoffs and Spacers are available in a variety of styles based on four main attributes: 1) shape 2) outer diameter of the body 3) body length and 4) thread size or clearance hole. Standoffs have a fifth attribute, thread type (we like to call it gender), as defined below.

Standoffs and Spacers can be hex, round or square shaped.

For standoffs, thread style comes three ways:

1) Female-female: can be fully threaded or partially threaded on each end.

2) Male-female: have internal female threads on one end and male threads on the other. Threads are generally the same size.

3) Male-male: have external threads on both ends which may be of differing thread size.

Common materials include aluminum, brass, phenolic, plastic/nylon, steel and stainless steel. Common platings include clear anondized, nickel, gold iridite and zinc plated. There are over 20 common platings available!

Some Standoffs are swaged, which means the parts have a shank at one end used to rivet or swage it into the circuit board.

Lesson Learned, considerations when selecting and using Standoffs and Spacers

Standoffs are sometimes referred to by their brand names, which can often be substituted by generic equivalents. Popular brands include: Amatom, Concord, Globe, H.H. Smith, Lyn-tron, Microplastics, Keystone, Pem, RAF, Unicorp.

To measure a Standoff or Spacer, measure the outside diameter of the body, the length of the body and the thread size. Determine if the standoff is a female-female, male-female or male-male. Here is a hint: the male part is externally threaded. A typical Standoff might measure as follows: 1/4 hex x 1/2 long x 8-32 thread male-female aluminum standoff. This exact standoff is made and branded by at least 10 manufacturers.

Standoffs are sometimes called out by their body length and thread dimensions. For example, an engineer might order a ½ x 8-32 standoff. It is often assumed that the outside diameter is ¼ and the standoff is a female-female configuration.

Phenolic standoffs and spacers are becoming less common. Check with your engineering department to determine if nylon is an appropriate substitute for phenolic. Nylon is less expensive and easier to come by.

Standoffs and Spacers sometimes show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series include NAS42, NAS43, NAS61, NAS1056, NAS1057, NAS1829, NAS1830, NAS1831

Jackscrews are a special type of male-female standoff that can come with nuts and washers. Jackscrews are often used when the motherboard is attached to the computer chassis.

Standoffs and Spacers at MF Supply

Here at MF Supply, we supply some of the most common and unusual Standoffs and Spacers, including:

The full range of commercial and mil-spec parts

Specials sizes, materials and platings. Just try to stump us!

We are authorized distributors for Amatom, Concord, Lyn-tron, Microplastics and RAF and offer the full range of brand names and equivalents.

For more detailed information, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=183...

And if you don't see it listed, as always, ask us. Finding the right screw for you is our tag line after all!

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Newsletter

Volume 3

February 18, 2013

What the heck is a Wire Insert?

Wire Inserts

Welcome to our “what the heck is that” series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. Today, we will introduce you to the Wire insert which was originally designed to repair parts with damaged threads, but has evolved for use in a variety of applications that save time and money and improve product reliability. Do we have your attention? Great, then read on…

What is a Wire Insert?

Wire inserts are precision-formed continuous wire coils that provide permanent, wear-resistant threads which exceed the strength of the parent material. Often underestimated, the popular misconception is that Wire inserts are intended solely for thread repair, when, in fact, they have other significant uses discussed in the next section. Not to be confused with other types of solid inserts or rivnuts, Wire inserts resemble springs and are sometimes referred to as "helicals".

Who uses Wire Inserts?

Wire inserts are used for 3 main reasons: 1) to repair damaged threads in parts that would otherwise have to be scrapped; 2) to strengthen threads against failures due to stripping, seizing or corrosion; 3) to convert threads between inch and metric sizes. We told you they were versatile!

What styles are available?

Wire inserts come in 2 main styles: tang and tangless.

The original and widely used tang style has a prong at one end to facilitate installation. The newer tangless style is becoming popular since this style had no prongs to break off, retrieve, or lose and is easily adjusted or removed after installation. Tangless inserts are commonly used in electronic applications where loose tangs might cause damage.

Wire Inserts can be free-running or locking

Free running is the most common style used for thread repair. The "free" diameter of the insert is larger than the installed diameter and this configuration generates balanced pressure distribution between the coils and threads.

Locking style inserts are recommended for applications that require constant torque, or are subject to stress or vibration. The locking style features a crimped turn that acts as a locking mechanism that grips the bolt or screw to prevent loosening from vibration, eliminating the need for lock wiring, lock-nuts, lockwashers, pellets/patches or other thread locking devices.

A third commonly used insert that deserves an honorable mention is a K-type Insert. Sometimes called by the brand Keensert, these externally threaded solid style inserts can be used in almost any material: aluminum, magnesium, cast iron, carbon steel, stainless steel and plastic. K-type inserts have locking "keys" that provide a mechanical lock, and are commonly used in heavy wear and high vibration situations.

5 Features & Benefits of Wire Inserts

1. Repair rather than scrap parts - Wire inserts remain the most cost effective, efficient and fastest method to repair damaged threads.

2. Stronger Assemblies - The flexibility of the insert provides a more balanced load distribution, practically eliminating thread erosion and providing better stress allocation, even in low strength materials.

3. Wear and Corrosion Resistance - Thread life is increased as thread friction is virtually eliminated, which becomes valuable in applications requiring repeated assembly and disassembly. Surface coatings are available for applications involving severe corrosive and extreme temperature conditions.

4. Minimize space and weight - Lighter and less expensive than other thread inserts, these wiry fellows can be incorporated into existing designs, often allowing the use of thinner or lighter parent materials.

5. Convert threads from Metric/Inch - Rather than replace all your hardware, taps and dies, you can use Wire inserts to convert threads and use your existing hardware and tools.

Lesson Learned, considerations when selecting and using Wire Inserts

Inserts are easy to install! You can use standard drill bits and plug taps to drill and tap the hole.

For high volume installations, consider strip feed inserts or use automatic or air-driven installation tools.

Inserts often show up under their Mil-spec numbers, which can be crossed to commercial equivalents. Some common Mil-spec series include MS122076 thru MS122275, NAS1130, MS124651 thru 124850, MS21208, MS21209, MS122076, MS33537, MA3279, MA3329, NA0276.

Wire inserts are sometimes referred to by their brand names, which can often be substituted by generic equivalents. Popular brands include: Helicoil, Kato, Keensert and EZ Lok.

Materials available include 18-8 stainless steel, phosphor bronze, X 750 Inconel, 316 Stainless steel and inserts may be lubricated or dry filmed to offer easy threading and corrosion protection.

Wire Inserts Available at MF Supply

Here at MF Supply, we supply some of the most common and unusual Wire inserts, including:

The full range of commercial and mil-spec parts

Products kits including single and multiple sizes

Specials including Giant metric, 8-pitch kits, left hand kits and special lengths and diameters

We are authorized distributors for Chrislynn and E-Z Lok

For more detailed information on Wire inserts, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=182...

And if you don't see it listed, as always, ask us. Finding the right screw for you is our tag line after all!

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Newsletter

Volume 2

August 22, 2012

What the heck is Mil-spec DFARS?

MS24693C

Welcome to the second edition of our “What the heck is that” series, where we discuss some of the unique fasteners and electronic hardware that manufacturers use in the design and assembly of their products. If you sell to the military either directly or indirectly, then you are probably aware of today’s topic: “DFARS” and “Mil-spec fasteners”.

What does Mil-spec mean anyway?

Before we get into the nitty gritty of DFARS, let’s discuss what makes a “Mil-spec” fastener. Mil-spec is the informal name for the military standard the U.S. Department of Defense uses in the production of military equipment. For example, the MS24693C pictured above is a fastener produced according to military standards.

Mil-spec fasteners look a lot like their civilian cousins, but, these little guys are made to a specific standard that defines in detail, the screw’s attributes, including: dimensions, tensile strength, hardness, threads, drive type, material qualities and plating, just to name a few. Mil-spec fasteners are even traceable by lot to designated manufacturers.

The government maintains a list of factories and suppliers who are qualified to manufacture and distribute Mil-spec fasteners. These suppliers have met all the government’s requirements and pass the highest quality control standards. This designation is called Qualified Suppliers List for Distributors [QSLD] and the Qualified Suppliers List for Manufacturer’s [QSLM].

AKA - Also known as…..

Mil-spec fasteners are usually designated by an AN, MS, NAS or NASM prefix followed by a part number. Each of these prefixes is an abbreviation: NAS stands for National Aerospace Standard and MS stands for Military Standard. An example of one of the most common and popular Mil-spec machine screws is the MS24693C. Its commercial equivalent is a Phillips Flat 100 degree Machine Screw in 300 series stainless steel. Below, we’ll tell you more about this popular fellow.

Who uses Mil-spec Fasteners?

Mil-spec fasteners are used by anyone manufacturing or servicing military equipment. Often, the bill of materials calls for specific Mil-spec grade fasteners in accordance with a part number, drawing or procurement requirement. Some of the most common uses of Mil-spec fasteners include aerospace and naval vessels.

Now, tell me about DFARS...

Almost a decade ago, the term “DFARS Compliant Material” came to the forefront for companies supplying parts and services to the government. The original Federal Acquisition Regulation (FAR) clause 252.225-7014 specified “A Preference for Domestic Specialty Metals.” What that means in our world is that for fasteners to be DFARS compliant, the metal used to fabricate them must be melted or manufactured in the United States or a qualifying country.

Qualifying countries include: Australia, Austria, Belgium, Canada, Czech Republic, Denmark, Egypt, Finland, France, Germany, Greece, Israel, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, United Kingdom of Great Britain and Northern Ireland.

Important Note: DFARS only pertains to fasteners made from “specialty metals” including: stainless steel, high alloy steel like Grade-BD, or Grade 5 Chromium steel with high chromium content.

To keep up to date with DFARs requirements, visit www.acq.osd.mil/dpap/dars/dfarspgi/current/index.... section 252.225

An example of a DFARS Mil-Spec Screw please!

As we’ve learned, the MS24693C is actually Phillips Flat 100 degree Machine screws in 300 series stainless steel. The MS24693-C4 is a 4-40 x 3/8 Phillips Flat 100 Degree Machine Screw in 302 Stainless Steel, and it is one of the most widely used sizes. Interestingly, the MS24693C superseded the AN662C series, so you might come across the AN662C on an older print of bill of materials. Keep in mind, with any design or manufacturing decision, the reason for using a specific screw generally rests in the hands of engineering.

Features of the MS24693C

Strict military standards ensure performance and reliability

Made/melted in the USA or other DFARs-approved country

Materials and dimensions meet Federal standard FF-S-92

Inspected per Mil-I-45208

Full lot traceability, manufacturer’s certification and chemical and physical certification

Available in diameters from #0 through 1/4 inch in coarse and fine thread and various lengths

Lessons Learned: Considerations when purchasing MS24693C or other Mil-spec DFARs fasteners

Always ask for “full certifications”. This includes part name, part description, date of manufacture, lot number, chemical composition of material, and treatment of material including plating or passivation.

At point of purchase, make sure the screws are DFARS. If you do not specifically ask for DFARS-compliant screws, you might receive screws that don’t meet the DFARS requirements, in which case, they won’t meet military standards. We’ve learned this the hard way so hopefully you don’t have to!

MS24693C and other Mil-spec DFARS Fasteners in Stock at MF Supply

Here at MF Supply, we stock some of the most common Mil-spec Fasteners, including the following: Machine Screws, Socket Screws, Hex Head Cap screws, Nuts, Flat washers and Standoffs and Spacers.

Visit us at www.mfsupply.com/v/vspfiles/assets/images/MFSUPPL... for our military linecard.

For more detailed information on Mil-spec Fasteners, visit us at www.mfsupply.com/SearchResults.asp?Cat=1823

And if you don’t see it listed, as always, ask us. Finding the right screw for you is our tag line after all!

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Newsletter

Volume 1

May 17, 2012

What the heck is a Cage Nut?

A Cage Nut contains a free floating threaded square Nut retained within a spring steel cage. The spring steel cage has two Mounting legs or wings that, when pressed together, allow the nut to clip into the square hole and lock the fastener in place within the rack hole.

Who uses Cage Nuts?

Cage Nuts are commonly used to mount lighting systems, electrical equipment or instruments onto rail racks. The Cage Nut clips into the rack's square mounting hole and usually positions the Nut toward the inside of the rack. The Nut is typically loose or "floating" in the Cage to allow for adjustments when installing the screw. This configuration allows flexibility in mounting and assembling components.

AKA...Also Known As..

Cage Nut is a funny little guy and answers to a bunch of different names - some of Cage Nut's favorite aliases are: Grip Nuts, Retainer Nuts, Rack Nuts or Floating Nuts. Lots of monikers!

Advantages of Cage Nuts

Snap directly into square rack holes

Easily installed with no special tools or skills, eliminating the need for special operations

The nut floats within the spring-steel cage which offsets normal hole misalignment

Can be easily popped out and replaced

Ideal when removal or installation of rack components might cause holes to strip

Combines flexibility of spring steel cage with the strength of a threaded nut

Lessons Learned when selecting Cage Nuts

I always recommend purchasing the corresponding screw to go with the Cage Nuts (i.e. buy the 3/8-16 Cage Nuts together with the 3/8-16 screws). This prevents you from selecting the wrong size Cage Nut. To be 100% sure, you should do a quick test to make sure the screws and Cage Nuts fit together before beginning the installation process.

When it comes to installation, Cage Nuts can be tough on your fingers when trying to install or uninstall them with your bare hands. Consider using a Cage Nut Tool.

Sizing is based on 3 components: the screw thread, panel thickness and mounting hole. Double check your measurements before you make your purchase.

Cage Nuts at MF Supply

Here at MF Supply, we stock some of the most common Cage Nut sizes and styles, from 6-32 up to 1/2-13, in Stainless Steel and Steel Zinc. For more detailed information on our Cage Nuts, visit us at http://www.mfsupply.com/SearchResults.asp?Cat=185...