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 9

Approved Vendor 1/4"-28x2-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16671 $2.09
Approved Vendor 1/4"-28x3" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16672 $2.65
Approved Vendor 1/4"-28x3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16677 $0.81
Approved Vendor 1/4-20x1" Grade 5 Serrated Hex Flange Bolts Zinc Yellow SKU 16851 $0.31
Approved Vendor 1/4-20x1" 18-8 Stainless Steel Serrated Hex Flange Bolts SKU 2081 $0.66
Approved Vendor 1/4-20x1" Brass Hex Tap Bolts Full Thread SKU 16868 $1.88
Approved Vendor 1/4-20x1" Grade 5 Hex Flange Bolts Zinc Clear SKU 16870 $0.35
Approved Vendor 1/4-20x1" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 16872 $0.34
Approved Vendor 1/4-20x1" Grade 5 Serrated Hex Large Flange Bolts Zinc Clear SKU 16873 $0.40
Approved Vendor 1/4-20x1" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 16874 $0.47
Approved Vendor 1/4-20x1" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 16875 $0.55
Approved Vendor 1/4-20x1" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 16876 $0.37
Approved Vendor 1/4-20x1" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 16877 $0.20
Approved Vendor 1/4-20x1" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 16878 $0.34
Approved Vendor 1/4-20x1" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 16879 $0.27
Approved Vendor 1/4-20x1" Stainless Steel Hex Cap Screws Bolts SKU 1116 $0.32
Approved Vendor 1/4-20x1-1/2" Grade 5 Serrated Hex Flange Bolts Zinc Yellow SKU 16891 $0.39
Approved Vendor 1/4-20x1-1/2" 18-8 Stainless Steel Serrated Hex Flange Bolts SKU 2083 $0.85
Approved Vendor 1/4-20x1-1/2" Brass Hex Tap Bolts Full Thread SKU 16908 $2.63
Approved Vendor 1/4-20x1-1/2" Grade 5 Hex Flange Bolts Zinc Clear SKU 16910 $0.51
Approved Vendor 1/4-20x1-1/2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 16912 $0.46
Approved Vendor 1/4-20x1-1/2" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 16913 $0.63
Approved Vendor 1/4-20x1-1/2" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 16914 $0.74
Approved Vendor 1/4-20x1-1/2" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 16915 $0.50
Approved Vendor 1/4-20x1-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 16916 $0.26
Approved Vendor 1/4-20x1-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 16917 $0.47
Approved Vendor 1/4-20x1-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 16918 $0.38
Approved Vendor 1/4-20x1-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 16919 $0.30
Approved Vendor 1/4-20x1-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1118 $0.44
Approved Vendor 1/4-20x1-1/4" Grade 5 Serrated Hex Flange Bolts Zinc Yellow SKU 16929 $0.34
Approved Vendor 1/4-20x1-1/4" 18-8 Stainless Steel Serrated Hex Flange Bolts SKU 2082 $0.75
Approved Vendor 1/4-20x1-1/4" Brass Hex Tap Bolts Full Thread SKU 16942 $2.27
Approved Vendor 1/4-20x1-1/4" Grade 5 Hex Flange Bolts Zinc Clear SKU 16944 $0.40
Approved Vendor 1/4-20x1-1/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 16946 $0.40
Approved Vendor 1/4-20x1-1/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 16947 $0.56
Approved Vendor 1/4-20x1-1/4" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 16948 $0.66
Approved Vendor 1/4-20x1-1/4" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 16949 $0.40
Approved Vendor 1/4-20x1-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 16950 $0.23
Approved Vendor 1/4-20x1-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 16951 $0.41
Approved Vendor 1/4-20x1-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 16952 $0.34
Approved Vendor 1/4-20x1-1/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 16953 $0.27
Approved Vendor 1/4-20x1-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1117 $0.37
Approved Vendor 1/4-20x1-3/4" Brass Hex Tap Bolts Full Thread SKU 16973 $2.52
Approved Vendor 1/4-20x1-3/4" Grade 5 Hex Flange Bolts Zinc Clear SKU 16974 $0.57
Approved Vendor 1/4-20x1-3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 16976 $0.58
Approved Vendor 1/4-20x1-3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 16977 $0.72
Approved Vendor 1/4-20x1-3/4" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 16978 $0.84
Approved Vendor 1/4-20x1-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 16979 $0.31

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