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 25

Approved Vendor 5/8"-11x2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25870 $10.23
Approved Vendor 5/8"-11x2-1/2" Aluminum Hex Head Cap Screw SKU 25874 $20.14
Approved Vendor 5/8"-11x2-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25875 $12.09
Approved Vendor 5/8"-11x2-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25879 $13.15
Approved Vendor 5/8"-11x3" Aluminum Hex Head Cap Screw SKU 25880 $22.65
Approved Vendor 5/8"-11x3" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25881 $14.09
Approved Vendor 5/8"-11x3-1/2" Aluminum Hex Head Cap Screw SKU 25884 $25.97
Approved Vendor 5/8"-11x3-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25885 $16.00
Approved Vendor 5/8"-11x4" Aluminum Hex Head Cap Screw SKU 25890 $26.66
Approved Vendor 5/8"-11x4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25891 $17.87
Approved Vendor 5/8"-11x4-1/2" Aluminum Hex Head Cap Screw SKU 25894 $36.93
Approved Vendor 5/8"-11x5" Aluminum Hex Head Cap Screw SKU 25897 $37.25
Approved Vendor 5/8"-11x5" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25898 $22.82
Approved Vendor 5/8"-11x5-1/2" Aluminum Hex Head Cap Screw SKU 25901 $38.49
Approved Vendor 5/8"-11x5-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25902 $24.98
Approved Vendor 5/8"-11x6" Aluminum Hex Head Cap Screw SKU 25907 $53.38
Approved Vendor 5/8"-11x6" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25908 $26.77
Approved Vendor 5/8"-18x1-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25982 $9.63
Approved Vendor 5/8"-18x1-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25983 $10.57
Approved Vendor 5/8"-18x2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25985 $11.59
Approved Vendor 5/8"-18x2-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25986 $13.71
Approved Vendor 5/8"-18x2-3/4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25987 $14.81
Approved Vendor 5/8"-18x3" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25989 $15.83
Approved Vendor 5/8"-18x3-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25990 $17.91
Approved Vendor 5/8"-18x4" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25992 $19.84
Approved Vendor 5/8"-18x4-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25993 $24.19
Approved Vendor 5/8"-18x5" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25994 $26.13
Approved Vendor 5/8"-18x5-1/2" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25995 $28.19
Approved Vendor 5/8"-18x6" Hex Cap Screws Grade L-9 Bolts USA Zinc Yellow SKU 25998 $31.14
Approved Vendor 5/8-11x1 Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 26071 $3.69
Approved Vendor 5/8-11x1" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 26078 $1.77
Approved Vendor 5/8-11x1" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 26079 $3.01
Approved Vendor 5/8-11x1" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 26080 $2.61
Approved Vendor 5/8-11x1-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1224 $3.46
Approved Vendor 5/8-11x1-1/2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 26089 $3.87
Approved Vendor 5/8-11x1-1/2" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 26090 $5.71
Approved Vendor 5/8-11x1-1/2" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 26091 $7.05
Approved Vendor 5/8-11x1-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 26092 $1.87
Approved Vendor 5/8-11x1-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 26093 $3.23
Approved Vendor 5/8-11x1-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 26094 $2.58
Approved Vendor 5/8-11x1-1/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 26102 $5.72
Approved Vendor 5/8-11x1-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 26103 $1.95
Approved Vendor 5/8-11x1-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 26105 $2.72
Approved Vendor 5/8-11x1-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1223 $3.26
Approved Vendor 5/8-11x1-3/4" Stainless Steel Hex Cap Screws Bolts SKU 1225 $3.81
Approved Vendor 5/8-11x1-3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 26113 $4.18
Approved Vendor 5/8-11x1-3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 26114 $5.77
Approved Vendor 5/8-11x1-3/4" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 26115 $7.12

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