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 8

Approved Vendor 1/2-20x8" Stainless Steel Hex Cap Screws Bolts SKU 1372 $12.56
Approved Vendor 1/4"-20 Coarse 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 1148 PCS SKU 16271 $112.36/pack of 1148
Approved Vendor 1/4"-20 Coarse 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 1149 PCS SKU 16272 $171.51/pack of 1149
Approved Vendor 1/4"-20 Coarse 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 575 PCS SKU 16273 $110.16/pack of 575
Approved Vendor 1/4"-20 Coarse Grade 5 Hex Cap Screws, Nuts, & Washers - 1148 PCS SKU 16274 $78.10/pack of 1148
Approved Vendor 1/4"-20 Coarse Grade 5 Hex Cap Screws, Nuts, & Washers - 1149 PCS SKU 16275 $137.25/pack of 1149
Approved Vendor 1/4"-20 Coarse Grade 5 Hex Cap Screws, Nuts, & Washers - 575 PCS SKU 16276 $89.23/pack of 575
Approved Vendor 1/4"-20 Coarse Grade 8 Hex Cap Screws, Nuts, & Washers - 1148 PCS SKU 16277 $100.54/pack of 1148
Approved Vendor 1/4"-20 Coarse Grade 8 Hex Cap Screws, Nuts, & Washers - 1149 PCS SKU 16278 $159.69/pack of 1149
Approved Vendor 1/4"-20 Coarse Grade 8 Hex Cap Screws, Nuts, & Washers - 575 PCS SKU 16279 $102.94/pack of 575
Approved Vendor 1/4"-20x1" Aluminum Hex Head Cap Screw SKU 16378 $2.19
Approved Vendor 1/4"-20x1" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16388 $0.89
Approved Vendor 1/4"-20x1-1/2" Aluminum Hex Head Cap Screw SKU 16400 $2.70
Approved Vendor 1/4"-20x1-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16409 $1.26
Approved Vendor 1/4"-20x1-1/4" Aluminum Hex Head Cap Screw SKU 16417 $2.67
Approved Vendor 1/4"-20x1-1/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16425 $1.05
Approved Vendor 1/4"-20x1-3/4" Aluminum Hex Head Cap Screw SKU 16434 $2.74
Approved Vendor 1/4"-20x1-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16436 $1.43
Approved Vendor 1/4"-20x1/2" Aluminum Hex Head Cap Screw SKU 16442 $1.67
Approved Vendor 1/4"-20x1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16452 $0.63
Approved Vendor 1/4"-20x2" Aluminum Hex Head Cap Screw SKU 16468 $3.17
Approved Vendor 1/4"-20x2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16475 $1.59
Approved Vendor 1/4"-20x2-1/2" Aluminum Hex Head Cap Screw SKU 16480 $3.74
Approved Vendor 1/4"-20x2-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16483 $1.93
Approved Vendor 1/4"-20x2-1/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16488 $1.81
Approved Vendor 1/4"-20x2-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16491 $1.98
Approved Vendor 1/4"-20x3" Aluminum Hex Head Cap Screw SKU 16492 $3.91
Approved Vendor 1/4"-20x3" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16495 $2.52
Approved Vendor 1/4"-20x3-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16500 $2.71
Approved Vendor 1/4"-20x3/4" Aluminum Hex Head Cap Screw SKU 16508 $1.60
Approved Vendor 1/4"-20x3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16518 $0.75
Approved Vendor 1/4"-20x4" Aluminum Hex Head Cap Screw SKU 16538 $5.54
Approved Vendor 1/4"-20x4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16539 $3.20
Approved Vendor 1/4"-28 Fine 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 1148 PCS SKU 16587 $144.97/pack of 1148
Approved Vendor 1/4"-28 Fine 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 1149 PCS SKU 16588 $204.12/pack of 1149
Approved Vendor 1/4"-28 Fine 18-8 Stainless Steel Hex Cap Screws, Nuts, & Washers - 575 PCS SKU 16589 $130.09/pack of 575
Approved Vendor 1/4"-28 Fine Grade 5 Hex Cap Screws, Nuts, & Washers - 1148 PCS SKU 16590 $93.04/pack of 1148
Approved Vendor 1/4"-28 Fine Grade 5 Hex Cap Screws, Nuts, & Washers - 1149 PCS SKU 16591 $152.19/pack of 1149
Approved Vendor 1/4"-28 Fine Grade 5 Hex Cap Screws, Nuts, & Washers - 575 PCS SKU 16592 $188.72/pack of 575
Approved Vendor 1/4"-28 Fine Grade 8 Hex Cap Screws, Nuts, & Washers - 1148 PCS SKU 16593 $116.03/pack of 1148
Approved Vendor 1/4"-28 Fine Grade 8 Hex Cap Screws, Nuts, & Washers - 1149 PCS SKU 16594 $175.18/pack of 1149
Approved Vendor 1/4"-28 Fine Grade 8 Hex Cap Screws, Nuts, & Washers - 575 PCS SKU 16595 $112.40/pack of 575
Approved Vendor 1/4"-28x1" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16661 $0.96
Approved Vendor 1/4"-28x1-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16662 $1.38
Approved Vendor 1/4"-28x1-1/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16663 $1.19
Approved Vendor 1/4"-28x1-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16664 $1.57
Approved Vendor 1/4"-28x1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16667 $0.69
Approved Vendor 1/4"-28x2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 16670 $1.74

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