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 11

Approved Vendor 1/4-20x2-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17107 $0.87
Approved Vendor 1/4-20x2-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17108 $0.74
Approved Vendor 1/4-20x2-3/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17109 $0.53
Approved Vendor 1/4-20x2-3/4" Stainless Steel Hex Cap Screws Bolts SKU 1123 $0.79
Approved Vendor 1/4-20x3" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17120 $0.93
Approved Vendor 1/4-20x3" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17121 $0.74
Approved Vendor 1/4-20x3" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17122 $0.58
Approved Vendor 1/4-20x3" Stainless Steel Hex Cap Screws Bolts SKU 1124 $0.85
Approved Vendor 1/4-20x3-1/2" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17132 $0.93
Approved Vendor 1/4-20x3-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17133 $0.64
Approved Vendor 1/4-20x3-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17134 $1.07
Approved Vendor 1/4-20x3-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17136 $0.66
Approved Vendor 1/4-20x3-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17141 $0.59
Approved Vendor 1/4-20x3-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17142 $1.05
Approved Vendor 1/4-20x3-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17143 $0.88
Approved Vendor 1/4-20x3-1/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17144 $0.67
Approved Vendor 1/4-20x3-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1125 $0.97
Approved Vendor 1/4-20x3-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17146 $0.74
Approved Vendor 1/4-20x3-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17147 $1.21
Approved Vendor 1/4-20x3-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17148 $1.01
Approved Vendor 1/4-20x3/4" 18-8 Stainless Steel Serrated Hex Flange Bolts SKU 2080 $0.59
Approved Vendor 1/4-20x3/4" Brass Hex Tap Bolts Full Thread SKU 17164 $1.57
Approved Vendor 1/4-20x3/4" Grade 5 Hex Flange Bolts Zinc Clear SKU 17166 $0.30
Approved Vendor 1/4-20x3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17168 $0.28
Approved Vendor 1/4-20x3/4" Grade 5 Serrated Hex Large Flange Bolts Zinc Clear SKU 17169 $0.34
Approved Vendor 1/4-20x3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17170 $0.43
Approved Vendor 1/4-20x3/4" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 17171 $0.51
Approved Vendor 1/4-20x3/4" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 17172 $0.34
Approved Vendor 1/4-20x3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17173 $0.16
Approved Vendor 1/4-20x3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17175 $0.24
Approved Vendor 1/4-20x3/4" Stainless Steel Hex Cap Screws Bolts SKU 1114 $0.27
Approved Vendor 1/4-20x3/8" Grade 5 Hex Flange Bolts Zinc Clear SKU 17194 $0.38
Approved Vendor 1/4-20x3/8" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 17195 $0.22
Approved Vendor 1/4-20x4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 17198 $1.04
Approved Vendor 1/4-20x4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17199 $0.74
Approved Vendor 1/4-20x4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17200 $1.23
Approved Vendor 1/4-20x4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17201 $1.08
Approved Vendor 1/4-20x4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17202 $0.76
Approved Vendor 1/4-20x4-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17208 $0.86
Approved Vendor 1/4-20x4-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17209 $1.46
Approved Vendor 1/4-20x4-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17210 $1.23
Approved Vendor 1/4-20x4-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17211 $0.86
Approved Vendor 1/4-20x4-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1129 $1.41
Approved Vendor 1/4-20x5" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 17212 $1.12
Approved Vendor 1/4-20x5" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 17213 $1.69
Approved Vendor 1/4-20x5" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 17214 $1.54
Approved Vendor 1/4-20x5" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 17215 $0.97
Approved Vendor 1/4-20x5" Stainless Steel Hex Cap Screws Bolts SKU 1130 $1.55

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