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 12

Approved Vendor 1/4-20x5-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17216 $1.26
Approved Vendor 1/4-20x5-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17217 $1.84
Approved Vendor 1/4-20x5-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17218 $1.71
Approved Vendor 1/4-20x5-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17219 $1.12
Approved Vendor 1/4-20x5-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1131 $1.70
Approved Vendor 1/4-20x5/8" Brass Hex Tap Bolts Full Thread SKU 17239 $1.43
Approved Vendor 1/4-20x5/8" Grade 5 Hex Flange Bolts Zinc Clear SKU 17240 $0.29
Approved Vendor 1/4-20x5/8" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17241 $0.29
Approved Vendor 1/4-20x5/8" Grade 5 Serrated Hex Flange Bolts Zinc Yellow SKU 17242 $0.25
Approved Vendor 1/4-20x5/8" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17243 $0.41
Approved Vendor 1/4-20x5/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17244 $0.16
Approved Vendor 1/4-20x5/8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17245 $0.24
Approved Vendor 1/4-20x6" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17246 $1.38
Approved Vendor 1/4-20x6" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17247 $2.01
Approved Vendor 1/4-20x6" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17248 $1.87
Approved Vendor 1/4-20x6" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17249 $1.23
Approved Vendor 1/4-20x7/8" Brass Hex Tap Bolts Full Thread SKU 17262 $1.48
Approved Vendor 1/4-20x7/8" Grade 5 Hex Flange Bolts Zinc Clear SKU 17263 $0.32
Approved Vendor 1/4-20x7/8" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17264 $0.27
Approved Vendor 1/4-20x7/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17265 $0.20
Approved Vendor 1/4-20x7/8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17266 $0.28
Approved Vendor 1/4-20x7/8" Stainless Steel Hex Cap Screws Bolts SKU 1115 $0.30
Approved Vendor 1/4-28x1" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17277 $0.41
Approved Vendor 1/4-28x1" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17278 $0.57
Approved Vendor 1/4-28x1" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17279 $0.26
Approved Vendor 1/4-28x1" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17280 $0.40
Approved Vendor 1/4-28x1" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17281 $0.36
Approved Vendor 1/4-28x1-1/2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17290 $0.55
Approved Vendor 1/4-28x1-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17291 $0.34
Approved Vendor 1/4-28x1-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17292 $0.55
Approved Vendor 1/4-28x1-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17293 $0.48
Approved Vendor 1/4-28x1-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1290 $0.65
Approved Vendor 1/4-28x1-1/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17299 $0.48
Approved Vendor 1/4-28x1-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17300 $0.29
Approved Vendor 1/4-28x1-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17301 $0.48
Approved Vendor 1/4-28x1-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17302 $0.41
Approved Vendor 1/4-28x1-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1289 $0.55
Approved Vendor 1/4-28x1-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17308 $0.39
Approved Vendor 1/4-28x1-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17309 $0.62
Approved Vendor 1/4-28x1-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17310 $0.54
Approved Vendor 1/4-28x1-3/4" Stainless Steel Hex Cap Screws Bolts SKU 1291 $0.74
Approved Vendor 1/4-28x1/2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17321 $0.32
Approved Vendor 1/4-28x1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17322 $0.18
Approved Vendor 1/4-28x1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17323 $0.27
Approved Vendor 1/4-28x1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17324 $0.25
Approved Vendor 1/4-28x2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17334 $0.44
Approved Vendor 1/4-28x2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17335 $0.71
Approved Vendor 1/4-28x2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17336 $0.62

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