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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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1-1/4-7 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
1/4-20 X 1-1/4 Square Head Machine Bolt Steel 1/4-20 X 1-1/4 Square Head Machine Bolt Steel Plain [1000 PER BOX]
Price per Box: $177.29 / Quantity Discounts Available
1/4-20 X 1 Square Head Machine Bolt Steel 1/4-20 X 1 Square Head Machine Bolt Steel Plain [1500 PER BOX]
Price per Box: $143.96 / Quantity Discounts Available
1/4-20 X 2 Square Head Machine Bolt Steel 1/4-20 X 2 Square Head Machine Bolt Steel Plain [800 PER BOX]
Price per Box: $174.59 / Quantity Discounts Available
1-8 X 10 Square Head Machine Bolt Steel 1-8 X 10 Square Head Machine Bolt Steel Plain [10 PER BOX]
Price per Box: $94.22 / Quantity Discounts Available
1-8 X 6 Square Head Machine Bolt Steel 1-8 X 6 Square Head Machine Bolt Steel Plain [20 PER BOX]
Price per Box: $179.86 / Quantity Discounts Available
1-8 X 7 Square Head Machine Bolt Steel 1-8 X 7 Square Head Machine Bolt Steel Plain [10 PER BOX]
Price per Box: $86.36 / Quantity Discounts Available
1-8 X 9 Square Head Machine Bolt Steel 1-8 X 9 Square Head Machine Bolt Steel Plain [20 PER BOX]
Price per Box: $301.92 / Quantity Discounts Available
3/4-10 X 2-1/2 Square Head Machine Bolt Steel 3/4-10 X 2-1/2 Square Head Machine Bolt Steel Plain [60 PER BOX]
Price per Box: $141.95 / Quantity Discounts Available
3/4-10 X 3 Square Head Machine Bolt Steel 3/4-10 X 3 Square Head Machine Bolt Steel Plain [60 PER BOX]
Price per Box: $149.97 / Quantity Discounts Available
3/4-10 X 3-1/4 Square Head Machine Bolt Steel 3/4-10 X 3-1/4 Square Head Machine Bolt Steel Plain [60 PER BOX]
Price per Box: $221.09 / Quantity Discounts Available
3/4-10 X 3-1/2 Square Head Machine Bolt Steel 3/4-10 X 3-1/2 Square Head Machine Bolt Steel Plain [60 PER BOX]
Price per Box: $176.74 / Quantity Discounts Available
3/4-10 X 4-1/2 Square Head Machine Bolt Steel 3/4-10 X 4-1/2 Square Head Machine Bolt Steel Plain [40 PER BOX]
Price per Box: $138.68 / Quantity Discounts Available
3/4-10 X 6 Square Head Machine Bolt Steel 3/4-10 X 6 Square Head Machine Bolt Steel Plain [40 PER BOX]
Price per Box: $237.09 / Quantity Discounts Available
3/8-16 X 1-1/4 Square Head Machine Bolt Steel 3/8-16 X 1-1/4 Square Head Machine Bolt Steel Plain [500 PER BOX]
Price per Box: $144.50 / Quantity Discounts Available
3/8-16 X 1-1/2 Square Head Machine Bolt Steel 3/8-16 X 1-1/2 Square Head Machine Bolt Steel Plain [500 PER BOX]
Price per Box: $210.89 / Quantity Discounts Available
3/8-16 X 1 Square Head Machine Bolt Steel 3/8-16 X 1 Square Head Machine Bolt Steel Plain [600 PER BOX]
Price per Box: $193.81 / Quantity Discounts Available
3/8-16 X 2-1/4 Square Head Machine Bolt Steel 3/8-16 X 2-1/4 Square Head Machine Bolt Steel Plain [300 PER BOX]
Price per Box: $165.06 / Quantity Discounts Available
3/8-16 X 2-1/2 Square Head Machine Bolt Steel 3/8-16 X 2-1/2 Square Head Machine Bolt Steel Plain [300 PER BOX]
Price per Box: $171.86 / Quantity Discounts Available
3/8-16 X 2-3/4 Square Head Machine Bolt Steel 3/8-16 X 2-3/4 Square Head Machine Bolt Steel Plain [300 PER BOX]
Price per Box: $202.51 / Quantity Discounts Available
3/8-16 X 2 Square Head Machine Bolt Steel 3/8-16 X 2 Square Head Machine Bolt Steel Plain [400 PER BOX]
Price per Box: $193.75 / Quantity Discounts Available
3/8-16 X 3-1/2 Square Head Machine Bolt Steel 3/8-16 X 3-1/2 Square Head Machine Bolt Steel Plain [200 PER BOX]
Price per Box: $166.02 / Quantity Discounts Available
3/8-16 X 3 Square Head Machine Bolt Steel 3/8-16 X 3 Square Head Machine Bolt Steel Plain [250 PER BOX]
Price per Box: $184.88 / Quantity Discounts Available
5/16-18 X 1-1/4 Square Head Machine Bolt Steel 5/16-18 X 1-1/4 Square Head Machine Bolt Steel Plain [700 PER BOX]
Price per Box: $128.84 / Quantity Discounts Available
5/16-18 X 1-1/2 Square Head Machine Bolt Steel 5/16-18 X 1-1/2 Square Head Machine Bolt Steel Plain [600 PER BOX]
Price per Box: $187.35 / Quantity Discounts Available
5/16-18 X 1 Square Head Machine Bolt Steel 5/16-18 X 1 Square Head Machine Bolt Steel Plain [800 PER BOX]
Price per Box: $120.80 / Quantity Discounts Available
5/16-18 X 2-1/2 Square Head Machine Bolt Steel 5/16-18 X 2-1/2 Square Head Machine Bolt Steel Plain [500 PER BOX]
Price per Box: $244.47 / Quantity Discounts Available
5/16-18 X 2 Square Head Machine Bolt Steel 5/16-18 X 2 Square Head Machine Bolt Steel Plain [500 PER BOX]
Price per Box: $181.78 / Quantity Discounts Available
5/16-18 X 3/4 Square Head Machine Bolt Steel 5/16-18 X 3/4 Square Head Machine Bolt Steel Plain [800 PER BOX]
Price per Box: $132.04 / Quantity Discounts Available
5/16-18 X 3 Square Head Machine Bolt Steel 5/16-18 X 3 Square Head Machine Bolt Steel Plain [400 PER BOX]
Price per Box: $249.79 / Quantity Discounts Available
5/16-18 X 4 Square Head Machine Bolt Steel 5/16-18 X 4 Square Head Machine Bolt Steel Plain [300 PER BOX]
Price per Box: $210.39 / Quantity Discounts Available
5/8-11 X 11 Square Head Machine Bolt Steel 5/8-11 X 11 Square Head Machine Bolt Steel Plain [50 PER BOX]
Price per Box: $507.50 / Quantity Discounts Available
5/8-11 X 2-1/2 Square Head Machine Bolt Steel 5/8-11 X 2-1/2 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $146.07 / Quantity Discounts Available
5/8-11 X 2-3/4 Square Head Machine Bolt Steel 5/8-11 X 2-3/4 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $178.32 / Quantity Discounts Available
5/8-11 X 2 Square Head Machine Bolt Steel 5/8-11 X 2 Square Head Machine Bolt Steel Plain [100 PER BOX]
Price per Box: $129.87 / Quantity Discounts Available
5/8-11 X 3-1/2 Square Head Machine Bolt Steel 5/8-11 X 3-1/2 Square Head Machine Bolt Steel Plain [75 PER BOX]
Price per Box: $178.91 / Quantity Discounts Available
5/8-11 X 3 Square Head Machine Bolt Steel 5/8-11 X 3 Square Head Machine Bolt Steel Plain [75 PER BOX]
Price per Box: $124.66 / Quantity Discounts Available
5/8-11 X 4 Square Head Machine Bolt Steel 5/8-11 X 4 Square Head Machine Bolt Steel Plain [75 PER BOX]
Price per Box: $159.33 / Quantity Discounts Available
5/8-11 X 5-1/2 Square Head Machine Bolt Steel 5/8-11 X 5-1/2 Square Head Machine Bolt Steel Plain [50 PER BOX]
Price per Box: $144.45 / Quantity Discounts Available
5/8-11 X 5 Square Head Machine Bolt Steel 5/8-11 X 5 Square Head Machine Bolt Steel Plain [75 PER BOX]
Price per Box: $224.62 / Quantity Discounts Available
5/8-11 X 6 Square Head Machine Bolt Steel 5/8-11 X 6 Square Head Machine Bolt Steel Plain [50 PER BOX]
Price per Box: $189.80 / Quantity Discounts Available
7/8-9 X 3-1/2 Square Head Machine Bolt Steel 7/8-9 X 3-1/2 Square Head Machine Bolt Steel Plain [30 PER BOX]
Price per Box: $173.49 / Quantity Discounts Available
7/8-9 X 4-1/2 Square Head Machine Bolt Steel 7/8-9 X 4-1/2 Square Head Machine Bolt Steel Plain [30 PER BOX]
Price per Box: $221.14 / Quantity Discounts Available
7/8-9 X 4 Square Head Machine Bolt Steel 7/8-9 X 4 Square Head Machine Bolt Steel Plain [30 PER BOX]
Price per Box: $171.60 / Quantity Discounts Available
   
 
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