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Inch Hex & Square Head Machine Bolts

Looking for Hex & Square Head Machine Bolts?

We carry Inch Hex & Square Head Machine Bolts manufactured to ASME B18.2.1 standards.

Stock sizes include: 1/4-20 through 3/4-10 (Hex) & 1-8 through 1-1/4-7 (Square) in Steel Hot Dip Galvanized (Hex) & Steel Plain (Square).

Scroll down to find your size, or search by part number.

Add to Cart and buy online or email us for a custom quote.  Most popular products are in stock and ship within 24 hours.

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!
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1/2-13 X 1-1/4 Hex Machine Bolt Steel 1/2-13 X 1-1/4 Hex Machine Bolt Steel Hot Dip Galvanized [375 PER BOX]
Price per Box: $177.77 / Quantity Discounts Available
1/2-13 X 1-1/2 Hex Machine Bolt Steel 1/2-13 X 1-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [300 PER BOX]
Price per Box: $165.01 / Quantity Discounts Available
1/2-13 X 1-3/4 Hex Machine Bolt Steel 1/2-13 X 1-3/4 Hex Machine Bolt Steel Hot Dip Galvanized [275 PER BOX]
Price per Box: $166.22 / Quantity Discounts Available
1/2-13 X 10 Hex Machine Bolt Steel 1/2-13 X 10 Hex Machine Bolt Steel Hot Dip Galvanized [65 PER BOX]
Price per Box: $219.75 / Quantity Discounts Available
1/2-13 X 11 Hex Machine Bolt Steel 1/2-13 X 11 Hex Machine Bolt Steel Hot Dip Galvanized [60 PER BOX]
Price per Box: $231.82 / Quantity Discounts Available
1/2-13 X 12 Hex Machine Bolt Steel 1/2-13 X 12 Hex Machine Bolt Steel Hot Dip Galvanized [55 PER BOX]
Price per Box: $216.71 / Quantity Discounts Available
1/2-13 X 14 Hex Machine Bolt Steel 1/2-13 X 14 Hex Machine Bolt Steel Hot Dip Galvanized [50 PER BOX]
Price per Box: $242.41 / Quantity Discounts Available
1/2-13 X 1 Hex Machine Bolt Steel 1/2-13 X 1 Hex Machine Bolt Steel Hot Dip Galvanized [400 PER BOX]
Price per Box: $207.27 / Quantity Discounts Available
1/2-13 X 2-1/2 Hex Machine Bolt Steel 1/2-13 X 2-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [225 PER BOX]
Price per Box: $218.44 / Quantity Discounts Available
1/2-13 X 2 Hex Machine Bolt Steel 1/2-13 X 2 Hex Machine Bolt Steel Hot Dip Galvanized [250 PER BOX]
Price per Box: $167.59 / Quantity Discounts Available
1/2-13 X 3-1/2 Hex Machine Bolt Steel 1/2-13 X 3-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [150 PER BOX]
Price per Box: $213.90 / Quantity Discounts Available
1/2-13 X 3 Hex Machine Bolt Steel 1/2-13 X 3 Hex Machine Bolt Steel Hot Dip Galvanized [200 PER BOX]
Price per Box: $188.54 / Quantity Discounts Available
1/2-13 X 4-1/2 Hex Machine Bolt Steel 1/2-13 X 4-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [125 PER BOX]
Price per Box: $171.45 / Quantity Discounts Available
1/2-13 X 4 Hex Machine Bolt Steel 1/2-13 X 4 Hex Machine Bolt Steel Hot Dip Galvanized [150 PER BOX]
Price per Box: $185.62 / Quantity Discounts Available
1/2-13 X 5-1/2 Hex Machine Bolt Steel 1/2-13 X 5-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [100 PER BOX]
Price per Box: $177.22 / Quantity Discounts Available
1/2-13 X 5 Hex Machine Bolt Steel 1/2-13 X 5 Hex Machine Bolt Steel Hot Dip Galvanized [125 PER BOX]
Price per Box: $188.24 / Quantity Discounts Available
1/2-13 X 6-1/2 Hex Machine Bolt Steel 1/2-13 X 6-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [100 PER BOX]
Price per Box: $238.12 / Quantity Discounts Available
1/2-13 X 6 Hex Machine Bolt Steel 1/2-13 X 6 Hex Machine Bolt Steel Hot Dip Galvanized [100 PER BOX]
Price per Box: $310.06 / Quantity Discounts Available
1/2-13 X 7 Hex Machine Bolt Steel 1/2-13 X 7 Hex Machine Bolt Steel Hot Dip Galvanized [90 PER BOX]
Price per Box: $132.68 / Quantity Discounts Available
1/2-13 X 8 Hex Machine Bolt Steel 1/2-13 X 8 Hex Machine Bolt Steel Hot Dip Galvanized [80 PER BOX]
Price per Box: $203.22 / Quantity Discounts Available
1/4-20 X 1-1/4 Hex Machine Bolt Steel 1/4-20 X 1-1/4 Hex Machine Bolt Steel Hot Dip Galvanized [1900 PER BOX]
Price per Box: $223.82 / Quantity Discounts Available
1/4-20 X 1-1/2 Hex Machine Bolt Steel 1/4-20 X 1-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [1600 PER BOX]
Price per Box: $219.88 / Quantity Discounts Available
1/4-20 X 1 Hex Machine Bolt Steel 1/4-20 X 1 Hex Machine Bolt Steel Hot Dip Galvanized [2200 PER BOX]
Price per Box: $245.45 / Quantity Discounts Available
1/4-20 X 2-1/2 Hex Machine Bolt Steel 1/4-20 X 2-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [900 PER BOX]
Price per Box: $194.02 / Quantity Discounts Available
1/4-20 X 2 Hex Machine Bolt Steel 1/4-20 X 2 Hex Machine Bolt Steel Hot Dip Galvanized [1200 PER BOX]
Price per Box: $244.08 / Quantity Discounts Available
1/4-20 X 4 Hex Machine Bolt Steel 1/4-20 X 4 Hex Machine Bolt Steel Hot Dip Galvanized [450 PER BOX]
Price per Box: $149.82 / Quantity Discounts Available
1/4-20 X 5 Hex Machine Bolt Steel 1/4-20 X 5 Hex Machine Bolt Steel Hot Dip Galvanized [400 PER BOX]
Price per Box: $177.06 / Quantity Discounts Available
1/4-20 X 6-1/2 Hex Machine Bolt Steel 1/4-20 X 6-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [350 PER BOX]
Price per Box: $183.09 / Quantity Discounts Available
1/4-20 X 8 Hex Machine Bolt Steel 1/4-20 X 8 Hex Machine Bolt Steel Hot Dip Galvanized [275 PER BOX]
Price per Box: $153.71 / Quantity Discounts Available
3/4-10 X 10 Hex Machine Bolt Steel 3/4-10 X 10 Hex Machine Bolt Steel Hot Dip Galvanized [30 PER BOX]
Price per Box: $221.52 / Quantity Discounts Available
3/4-10 X 12 Hex Machine Bolt Steel 3/4-10 X 12 Hex Machine Bolt Steel Hot Dip Galvanized [25 PER BOX]
Price per Box: $223.44 / Quantity Discounts Available
3/4-10 X 14 Hex Machine Bolt Steel 3/4-10 X 14 Hex Machine Bolt Steel Hot Dip Galvanized [20 PER BOX]
Price per Box: $210.95 / Quantity Discounts Available
3/4-10 X 2-1/2 Hex Machine Bolt Steel 3/4-10 X 2-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [90 PER BOX]
Price per Box: $201.47 / Quantity Discounts Available
3/4-10 X 2 Hex Machine Bolt Steel 3/4-10 X 2 Hex Machine Bolt Steel Hot Dip Galvanized [100 PER BOX]
Price per Box: $190.07 / Quantity Discounts Available
3/4-10 X 3-1/2 Hex Machine Bolt Steel 3/4-10 X 3-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [70 PER BOX]
Price per Box: $203.85 / Quantity Discounts Available
3/4-10 X 3 Hex Machine Bolt Steel 3/4-10 X 3 Hex Machine Bolt Steel Hot Dip Galvanized [80 PER BOX]
Price per Box: $205.98 / Quantity Discounts Available
3/4-10 X 4 Hex Machine Bolt Steel 3/4-10 X 4 Hex Machine Bolt Steel Hot Dip Galvanized [60 PER BOX]
Price per Box: $230.35 / Quantity Discounts Available
3/4-10 X 5 Hex Machine Bolt Steel 3/4-10 X 5 Hex Machine Bolt Steel Hot Dip Galvanized [45 PER BOX]
Price per Box: $158.85 / Quantity Discounts Available
3/4-10 X 6-1/2 Hex Machine Bolt Steel 3/4-10 X 6-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [40 PER BOX]
Price per Box: $208.89 / Quantity Discounts Available
3/4-10 X 7-1/2 Hex Machine Bolt Steel 3/4-10 X 7-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [35 PER BOX]
Price per Box: $198.26 / Quantity Discounts Available
3/8-16 X 1-1/4 Hex Machine Bolt Steel 3/8-16 X 1-1/4 Hex Machine Bolt Steel Hot Dip Galvanized [800 PER BOX]
Price per Box: $207.12 / Quantity Discounts Available
3/8-16 X 1-1/2 Hex Machine Bolt Steel 3/8-16 X 1-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [675 PER BOX]
Price per Box: $185.33 / Quantity Discounts Available
3/8-16 X 1 Hex Machine Bolt Steel 3/8-16 X 1 Hex Machine Bolt Steel Hot Dip Galvanized [900 PER BOX]
Price per Box: $205.51 / Quantity Discounts Available
3/8-16 X 2-1/2 Hex Machine Bolt Steel 3/8-16 X 2-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [400 PER BOX]
Price per Box: $146.03 / Quantity Discounts Available
3/8-16 X 2 Hex Machine Bolt Steel 3/8-16 X 2 Hex Machine Bolt Steel Hot Dip Galvanized [550 PER BOX]
Price per Box: $229.49 / Quantity Discounts Available
3/8-16 X 3-1/2 Hex Machine Bolt Steel 3/8-16 X 3-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [300 PER BOX]
Price per Box: $182.37 / Quantity Discounts Available
3/8-16 X 3 Hex Machine Bolt Steel 3/8-16 X 3 Hex Machine Bolt Steel Hot Dip Galvanized [325 PER BOX]
Price per Box: $163.12 / Quantity Discounts Available
3/8-16 X 4-1/2 Hex Machine Bolt Steel 3/8-16 X 4-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [225 PER BOX]
Price per Box: $172.55 / Quantity Discounts Available
3/8-16 X 4 Hex Machine Bolt Steel 3/8-16 X 4 Hex Machine Bolt Steel Hot Dip Galvanized [250 PER BOX]
Price per Box: $163.25 / Quantity Discounts Available
3/8-16 X 5 Hex Machine Bolt Steel 3/8-16 X 5 Hex Machine Bolt Steel Hot Dip Galvanized [225 PER BOX]
Price per Box: $190.42 / Quantity Discounts Available
3/8-16 X 6 Hex Machine Bolt Steel 3/8-16 X 6 Hex Machine Bolt Steel Hot Dip Galvanized [175 PER BOX]
Price per Box: $173.33 / Quantity Discounts Available
5/16-18 X 1-1/2 Hex Machine Bolt Steel 5/16-18 X 1-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [1000 PER BOX]
Price per Box: $221.09 / Quantity Discounts Available
5/16-18 X 2-1/2 Hex Machine Bolt Steel 5/16-18 X 2-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [600 PER BOX]
Price per Box: $213.86 / Quantity Discounts Available
5/16-18 X 3-1/2 Hex Machine Bolt Steel 5/16-18 X 3-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [450 PER BOX]
Price per Box: $208.94 / Quantity Discounts Available
5/16-18 X 3/4 Hex Machine Bolt Steel 5/16-18 X 3/4 Hex Machine Bolt Steel Hot Dip Galvanized [1500 PER BOX]
Price per Box: $275.63 / Quantity Discounts Available
5/16-18 X 4-1/2 Hex Machine Bolt Steel 5/16-18 X 4-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [300 PER BOX]
Price per Box: $209.51 / Quantity Discounts Available
5/16-18 X 5 Hex Machine Bolt Steel 5/16-18 X 5 Hex Machine Bolt Steel Hot Dip Galvanized [250 PER BOX]
Price per Box: $161.80 / Quantity Discounts Available
5/8-11 X 1-1/2 Hex Machine Bolt Steel 5/8-11 X 1-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [200 PER BOX]
Price per Box: $174.69 / Quantity Discounts Available
5/8-11 X 1-3/4 Hex Machine Bolt Steel 5/8-11 X 1-3/4 Hex Machine Bolt Steel Hot Dip Galvanized [175 PER BOX]
Price per Box: $168.90 / Quantity Discounts Available
5/8-11 X 10 Hex Machine Bolt Steel 5/8-11 X 10 Hex Machine Bolt Steel Hot Dip Galvanized [40 PER BOX]
Price per Box: $233.90 / Quantity Discounts Available
5/8-11 X 11 Hex Machine Bolt Steel 5/8-11 X 11 Hex Machine Bolt Steel Hot Dip Galvanized [40 PER BOX]
Price per Box: $248.06 / Quantity Discounts Available
5/8-11 X 12 Hex Machine Bolt Steel 5/8-11 X 12 Hex Machine Bolt Steel Hot Dip Galvanized [35 PER BOX]
Price per Box: $223.91 / Quantity Discounts Available
5/8-11 X 2-1/4 Hex Machine Bolt Steel 5/8-11 X 2-1/4 Hex Machine Bolt Steel Hot Dip Galvanized [150 PER BOX]
Price per Box: $174.95 / Quantity Discounts Available
5/8-11 X 2-1/2 Hex Machine Bolt Steel 5/8-11 X 2-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [125 PER BOX]
Price per Box: $153.42 / Quantity Discounts Available
5/8-11 X 2 Hex Machine Bolt Steel 5/8-11 X 2 Hex Machine Bolt Steel Hot Dip Galvanized [175 PER BOX]
Price per Box: $186.52 / Quantity Discounts Available
5/8-11 X 3-1/2 Hex Machine Bolt Steel 5/8-11 X 3-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [100 PER BOX]
Price per Box: $207.36 / Quantity Discounts Available
5/8-11 X 3 Hex Machine Bolt Steel 5/8-11 X 3 Hex Machine Bolt Steel Hot Dip Galvanized [100 PER BOX]
Price per Box: $177.42 / Quantity Discounts Available
5/8-11 X 4-1/2 Hex Machine Bolt Steel 5/8-11 X 4-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [80 PER BOX]
Price per Box: $192.14 / Quantity Discounts Available
5/8-11 X 4 Hex Machine Bolt Steel 5/8-11 X 4 Hex Machine Bolt Steel Hot Dip Galvanized [90 PER BOX]
Price per Box: $175.71 / Quantity Discounts Available
5/8-11 X 5 Hex Machine Bolt Steel 5/8-11 X 5 Hex Machine Bolt Steel Hot Dip Galvanized [75 PER BOX]
Price per Box: $191.73 / Quantity Discounts Available
5/8-11 X 6-1/2 Hex Machine Bolt Steel 5/8-11 X 6-1/2 Hex Machine Bolt Steel Hot Dip Galvanized [60 PER BOX]
Price per Box: $211.89 / Quantity Discounts Available
5/8-11 X 6 Hex Machine Bolt Steel 5/8-11 X 6 Hex Machine Bolt Steel Hot Dip Galvanized [65 PER BOX]
Price per Box: $194.60 / Quantity Discounts Available
5/8-11 X 7 Hex Machine Bolt Steel 5/8-11 X 7 Hex Machine Bolt Steel Hot Dip Galvanized [55 PER BOX]
Price per Box: $188.40 / Quantity Discounts Available
5/8-11 X 8 Hex Machine Bolt Steel 5/8-11 X 8 Hex Machine Bolt Steel Hot Dip Galvanized [50 PER BOX]
Price per Box: $203.40 / Quantity Discounts Available
1-1/4-7 X 6 Square Head Machine Bolt Steel 1-1/4-7 X 6 Square Head Machine Bolt Steel Plain [10 PER BOX]
Price per Box: $243.54 / Quantity Discounts Available
1/2-13 X 1-1/4 Square Head Machine Bolt Steel 1/2-13 X 1-1/4 Square Head Machine Bolt Steel Plain [250 PER BOX]
Price per Box: $132.88 / Quantity Discounts Available
1/2-13 X 1-1/2 Square Head Machine Bolt Steel 1/2-13 X 1-1/2 Square Head Machine Bolt Steel Plain [250 PER BOX]
Price per Box: $144.60 / Quantity Discounts Available
1/2-13 X 1-3/4 Square Head Machine Bolt Steel 1/2-13 X 1-3/4 Square Head Machine Bolt Steel Plain [250 PER BOX]
Price per Box: $166.57 / Quantity Discounts Available
1/2-13 X 12 Square Head Machine Bolt Steel 1/2-13 X 12 Square Head Machine Bolt Steel Plain [50 PER BOX]
Price per Box: $537.23 / Quantity Discounts Available
1/2-13 X 1 Square Head Machine Bolt Steel 1/2-13 X 1 Square Head Machine Bolt Steel Plain [300 PER BOX]
Price per Box: $183.99 / Quantity Discounts Available
1/2-13 X 2-1/4 Square Head Machine Bolt Steel 1/2-13 X 2-1/4 Square Head Machine Bolt Steel Plain [200 PER BOX]
Price per Box: $233.47 / Quantity Discounts Available
1/2-13 X 2-1/2 Square Head Machine Bolt Steel 1/2-13 X 2-1/2 Square Head Machine Bolt Steel Plain [150 PER BOX]
Price per Box: $123.66 / Quantity Discounts Available
1/2-13 X 2 Square Head Machine Bolt Steel 1/2-13 X 2 Square Head Machine Bolt Steel Plain [200 PER BOX]
Price per Box: $150.98 / Quantity Discounts Available
1/2-13 X 3-1/2 Square Head Machine Bolt Steel 1/2-13 X 3-1/2 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $126.38 / Quantity Discounts Available
1/2-13 X 3 Square Head Machine Bolt Steel 1/2-13 X 3 Square Head Machine Bolt Steel Plain [150 PER BOX]
Price per Box: $196.42 / Quantity Discounts Available
1/2-13 X 4-1/2 Square Head Machine Bolt Steel 1/2-13 X 4-1/2 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $183.32 / Quantity Discounts Available
1/2-13 X 4 Square Head Machine Bolt Steel 1/2-13 X 4 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $149.13 / Quantity Discounts Available
1/2-13 X 6 Square Head Machine Bolt Steel 1/2-13 X 6 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $241.95 / Quantity Discounts Available
1/2-13 X 7-1/2 Square Head Machine Bolt Steel 1/2-13 X 7-1/2 Square Head Machine Bolt Steel Plain [75 PER BOX]
Price per Box: $336.38 / Quantity Discounts Available
1/2-13 X 7 Square Head Machine Bolt Steel 1/2-13 X 7 Square Head Machine Bolt Steel Plain [75 PER BOX]
Price per Box: $196.45 / Quantity Discounts Available
   
 
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