Helical Inserts Cross-Reference
Inch, Mil-Spec & Metric

At MF Supply, we specialize in sourcing hard-to-find, backordered, costly, or out-of-stock OEM fasteners—helping customers reduce lead times and lower costs without compromising quality.

One of our core competencies is providing functional equivalents to expensive brand-name helical inserts (often called Helicoil inserts, helical coil inserts, helical wire inserts, or helical threaded inserts) from top brands like HeliCoil®, Recoil®, KATO®, E-Z Lok, PowerCoil, Bollhoff, Perma-Coil, V-Coil, Time-Sert and more. Available in inch/imperial, Mil-Spec, and metric sizes—and in a wide range of styles, options, and materials.

Use our cross-reference tables below to find equivalents for HeliCoil®, Recoil® and Mil-Spec parts, such as MA3329, MA3379, MS122XXX, MS124XXX, and more!

Why Buy Helical Inserts from MF Supply?

With over 50 years of experience as a trusted supply chain partner to manufacturers, government, and industry, MF Supply offers deep and broad expertise in fasteners and inserts to support all your hardware and fastening needs. We stock and source a large inventory of helical inserts, including major brands and equivalents across all styles, options, and materials outlined below.

Styles/Series:

• Tanged: MF Supply currently specializes in the tanged style only.
• Mil-Spec Series: MA3329, MA3379, MS122XXX, MS124XXX, and MS21209

Options:

• Free-Running and Self-Locking
• Coarse Thread (UNC) and Fine Thread (UNF)

Materials:

• 18-8/316 Stainless Steel

Our Mil-Spec and certified helical inserts are DFAR compliant and come with the manufacturer’s Certificate of Conformance (COC). Full physical and chemical certifications are available upon request.

Can't find what you're looking for? Email us at [email protected] for a custom quote. "We have the right screw for you" is our motto after all!