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 13

Approved Vendor 1/4-28x2-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17341 $0.54
Approved Vendor 1/4-28x2-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17342 $0.88
Approved Vendor 1/4-28x2-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17343 $0.76
Approved Vendor 1/4-28x2-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17344 $0.49
Approved Vendor 1/4-28x2-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17345 $0.80
Approved Vendor 1/4-28x2-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17346 $0.70
Approved Vendor 1/4-28x2-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17347 $0.59
Approved Vendor 1/4-28x2-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17348 $0.97
Approved Vendor 1/4-28x2-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17349 $0.84
Approved Vendor 1/4-28x3" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17353 $0.63
Approved Vendor 1/4-28x3" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17354 $1.04
Approved Vendor 1/4-28x3" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17355 $0.90
Approved Vendor 1/4-28x3-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17357 $0.79
Approved Vendor 1/4-28x3-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17358 $1.21
Approved Vendor 1/4-28x3-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17359 $1.06
Approved Vendor 1/4-28x3-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17360 $0.70
Approved Vendor 1/4-28x3-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17361 $1.14
Approved Vendor 1/4-28x3-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17362 $0.85
Approved Vendor 1/4-28x3-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17363 $1.29
Approved Vendor 1/4-28x3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17375 $0.34
Approved Vendor 1/4-28x3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17376 $0.38
Approved Vendor 1/4-28x3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17377 $0.22
Approved Vendor 1/4-28x3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17378 $0.33
Approved Vendor 1/4-28x3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17379 $0.30
Approved Vendor 1/4-28x4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17385 $0.91
Approved Vendor 1/4-28x4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17386 $1.39
Approved Vendor 1/4-28x4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17387 $1.24
Approved Vendor 1/4-28x4-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17388 $1.02
Approved Vendor 1/4-28x4-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17389 $1.39
Approved Vendor 1/4-28x5" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17390 $1.34
Approved Vendor 1/4-28x5" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17391 $1.78
Approved Vendor 1/4-28x5" Stainless Steel Hex Cap Screws Bolts SKU 1300 $1.99
Approved Vendor 1/4-28x5-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17392 $1.49
Approved Vendor 1/4-28x5-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17393 $1.98
Eagle 1/4-28x5-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1301 $2.16
Approved Vendor 1/4-28x5/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17408 $0.20
Approved Vendor 1/4-28x5/8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17409 $0.28
Approved Vendor 1/4-28x6" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17410 $1.63
Approved Vendor 1/4-28x6" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17411 $2.16
Approved Vendor 1/4-28x6" Stainless Steel Hex Cap Screws Bolts SKU 1302 $2.37
Approved Vendor 1/4-28x7/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17422 $0.24
Approved Vendor 10-32x1" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17752 $0.29
Approved Vendor 10-32x1/2" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17753 $0.21
Approved Vendor 10-32x3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17754 $0.24
Approved Vendor 3/4"-10x1-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 21023 $14.34
Approved Vendor 3/4"-10x1-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 21026 $15.55
Approved Vendor 3/4"-10x2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 21033 $15.76
Approved Vendor 3/4"-10x2-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 21036 $18.49

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