Hex Bolts & Cap Screws

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Expected delivery: Wed, Nov 18

Hex bolts and hex cap screws are the workhorse fasteners for machinery, structural brackets, truck bodies and equipment repair. This section covers inch sizes in UNC and UNF threads and metric sizes in class 8.8 and 10.9, with partial or full threads. Materials include Grade 2, Grade 5 and Grade 8 steel plus 18-8 and 316 stainless, in plain, zinc, yellow zinc and hot-dip galvanized finishes.

What to check before you order

Grade or property class. Match the grade to the load. Grade 5 covers most equipment work, and Grade 8 is for high-stress joints such as suspension and heavy machinery. The hex bolt grades guide shows head markings.
Thread pitch. A 1/2" bolt comes in 1/2"-13 coarse and 1/2"-20 fine. They will not interchange, so confirm the nut or tapped hole first.
Length and thread length. Measure from under the head. Longer bolts are often partially threaded, which leaves a smooth shank in the shear plane.
Finish. Hot-dip galvanized bolts need galvanized nuts, because the coating adds thickness to the threads.

Common questions

Is a Grade 8 bolt always the safer choice?

Not always. Grade 8 is stronger but less ductile than Grade 5. Use the grade the equipment maker or engineer specifies.

Pair your bolts with matching nuts and washers, or browse all fasteners.

Hex Bolts & Cap Screws: page 17

Approved Vendor 3/4-16x3-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 21369 $9.93
Approved Vendor 3/4-16x3-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 21370 $6.99
Approved Vendor 3/4-16x3-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21371 $11.30
Approved Vendor 3/4-16x3-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21372 $12.57
Approved Vendor 3/4-16x4" Stainless Steel Hex Cap Screws Bolts SKU 1410 $16.92
Approved Vendor 3/4-16x4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21373 $12.73
Approved Vendor 3/4-16x4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 21374 $11.12
Approved Vendor 3/4-16x4-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1411 $18.57
Approved Vendor 3/4-16x4-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21375 $14.71
Approved Vendor 3/4-16x4-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 21376 $12.86
Approved Vendor 3/4-16x5" Stainless Steel Hex Cap Screws Bolts SKU 1412 $20.21
Approved Vendor 3/4-16x5" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21377 $15.47
Approved Vendor 3/4-16x5" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 21378 $14.19
Approved Vendor 3/4-16x5-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1413 $22.58
Approved Vendor 3/4-16x5-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21379 $17.50
Approved Vendor 3/4-16x5-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 21380 $15.31
Approved Vendor 3/4-16x6" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 21381 $19.77
Approved Vendor 3/4-16x6" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 21382 $16.58
Approved Vendor 3/4-16x6" Stainless Steel Hex Cap Screws Bolts SKU 1414 $24.22
Approved Vendor 3/8"-16 Coarse 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 378 PCS SKU 22396 $130.02/pack of 378
Approved Vendor 3/8"-16 Coarse 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 754 PCS SKU 22397 $144.85/pack of 754
Approved Vendor 3/8"-16 Coarse 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 755 PCS SKU 22398 $204.00/pack of 755
Approved Vendor 3/8"-16 Coarse Grade 5 Hex Cap Screws, Nuts, & Washers - 378 PCS SKU 22399 $96.41/pack of 378
Approved Vendor 3/8"-16 Coarse Grade 5 Hex Cap Screws, Nuts, & Washers - 754 PCS SKU 22400 $89.87/pack of 754
Approved Vendor 3/8"-16 Coarse Grade 5 Hex Cap Screws, Nuts, & Washers - 755 PCS SKU 22401 $149.01/pack of 755
Approved Vendor 3/8"-16 Coarse Grade 8 Hex Cap Screws, Nuts, & Washers - 378 PCS SKU 22402 $113.91/pack of 378
Approved Vendor 3/8"-16 Coarse Grade 8 Hex Cap Screws, Nuts, & Washers - 754 PCS SKU 22403 $118.50/pack of 754
Approved Vendor 3/8"-16 Coarse Grade 8 Hex Cap Screws, Nuts, & Washers - 755 PCS SKU 22404 $177.64/pack of 755
Approved Vendor 3/8"-16x1" Aluminum Hex Head Cap Screw SKU 22495 $3.84
Approved Vendor 3/8"-16x1" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22501 $1.94
Approved Vendor 3/8"-16x1-1/2" Aluminum Hex Head Cap Screw SKU 22507 $4.73
Approved Vendor 3/8"-16x1-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22511 $2.63
Approved Vendor 3/8"-16x1-1/4" Aluminum Hex Head Cap Screw SKU 22515 $4.34
Approved Vendor 3/8"-16x1-1/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22519 $2.27
Approved Vendor 3/8"-16x1-3/4" Aluminum Hex Head Cap Screw SKU 22523 $5.25
Approved Vendor 3/8"-16x1-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22525 $2.98
Approved Vendor 3/8"-16x1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22533 $1.39
Approved Vendor 3/8"-16x2" Aluminum Hex Head Cap Screw SKU 22540 $6.25
Approved Vendor 3/8"-16x2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22544 $3.36
Approved Vendor 3/8"-16x2-1/2" Aluminum Hex Head Cap Screw SKU 22548 $7.16
Approved Vendor 3/8"-16x2-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22552 $4.05
Approved Vendor 3/8"-16x2-1/4" Aluminum Hex Head Cap Screw SKU 22556 $6.15
Approved Vendor 3/8"-16x2-1/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22557 $3.71
Approved Vendor 3/8"-16x2-3/4" Aluminum Hex Head Cap Screw SKU 22560 $7.36
Approved Vendor 3/8"-16x2-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22562 $4.39
Approved Vendor 3/8"-16x3" Aluminum Hex Head Cap Screw SKU 22568 $11.83
Approved Vendor 3/8"-16x3" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 22571 $4.77
Approved Vendor 3/8"-16x3-1/2" Aluminum Hex Head Cap Screw SKU 22575 $9.48

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