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 32

Approved Vendor 9/16-18x4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 30938 $4.91
Approved Vendor 9/16-18x4" Stainless Steel Hex Cap Screws Bolts SKU 1383 $9.25
Approved Vendor 9/16-18x4-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 30939 $5.39
Approved Vendor 9/16-18x4-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1384 $10.19
Approved Vendor 9/16-18x5" Stainless Steel Hex Cap Screws Bolts SKU 1385 $11.13
Approved Vendor 9/16-18x5-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 30940 $6.73
Approved Vendor 9/16-18x5-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 28975 $9.20
Approved Vendor 9/16-18x6" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 30941 $7.36
Approved Vendor 9/16-18x6" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 31620 $11.77
Approved Vendor 9/16-18x6" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 30951 $9.91
Approved Vendor 9/16-18x6" Stainless Steel Hex Cap Screws Bolts SKU 1387 $13.39
Bolt Grip 5PC Upgrad E Set Irwin SKU 585-394002 $81.93/pack of 5
Irwin Bolt-Grip 5PC Deep Wellset SKU 585-3094001 $109.08/pack of 5
Irwin Deep Well Bolt Grip 3/8 SKU 585-1876227 $83.73
DBI-SALA Fasten-in-Place HLL Bolt-on Floor Base 8530267 SKU 098-8530267 $1,264.53
DBI-SALA Fasten-Inplace HLL Bolt-on Vertical Base 7400218 SKU 098-7400218 $1,241.55
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers 1/4", 5/16" 3/8", & 1/2" - 575 PCS SKU 31659 $116.26/pack of 575
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers 1/4", 5/16", & 3/8"- 574 PCS SKU 31633 $98.59/pack of 574
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers Coarse Thread Zinc Yellow 1/4", 5/16" 3/8", & 1/2" - 1268 PCS SKU 26445 $126.59/pack of 1268
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers Coarse Thread Zinc Yellow 1/4", 5/16" 3/8", & 1/2" - 1269 PCS SKU 31636 $185.74/pack of 1269
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers Fine Thread Zinc Yellow 1/4", 5/16" 3/8", & 1/2" - 1268 PCS SKU 26447 $151.30/pack of 1268
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers Fine Thread Zinc Yellow 1/4", 5/16" 3/8", & 1/2" - 1269 PCS SKU 31637 $210.45/pack of 1269
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers Fine Thread Zinc Yellow 1/4", 5/16" 3/8", & 1/2" - 574 PCS SKU 26449 $100.39/pack of 574
Approved Vendor Inch Grade 8 Hex Cap Screws, Hex Nuts, Flat & Lock Washers Fine Thread Zinc Yellow 1/4", 5/16" 3/8", & 1/2" - 575 PCS SKU 31641 $131.17/pack of 575
Approved Vendor M10-1.25x100 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 27067 $3.30
Approved Vendor M10-1.25x16 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 27004 $1.04
Approved Vendor M10-1.25x20 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26768 $0.34
Approved Vendor M10-1.25x25 Class 10.9 Fine Thread Hex Flange Bolts Phos & Oil SKU 27420 $1.45
Approved Vendor M10-1.25x25 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26698 $1.20
Approved Vendor M10-1.25x25 Class 8.8 Hex Cap Screws Zinc Clear SKU 27322 $1.35
Approved Vendor M10-1.25x30 Class 10.9 Fine Thread Hex Cap Screws Zinc Clear SKU 27178 $1.23
Approved Vendor M10-1.25x30 Class 10.9 Hex Flange Bolts Zinc Clear SKU 26676 $1.32
Approved Vendor M10-1.25x30 Class 8.8 Hex Cap Screws Zinc Clear SKU 27095 $1.03
Approved Vendor M10-1.25x35 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26767 $1.42
Approved Vendor M10-1.25x35 Class 8.8 Hex Cap Screws Zinc Clear SKU 27491 $1.14
Approved Vendor M10-1.25x40 Class 10.9 Fine Thread Hex Cap Screws Zinc Clear SKU 27393 $1.68
Approved Vendor M10-1.25x40 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26713 $1.55
Approved Vendor M10-1.25x40 Class 8.8 Hex Cap Screws Zinc Clear SKU 27181 $1.40
Approved Vendor M10-1.25x45 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26945 $1.72
Approved Vendor M10-1.25x50 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26736 $0.57
Approved Vendor M10-1.25x60 Class 10.9 Fine Thread Hex Cap Screws Zinc Clear SKU 27368 $2.20
Approved Vendor M10-1.25x60 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26833 $2.11
Approved Vendor M10-1.25x70 Class 10.9 Fine Thread Hex Cap Screws Zinc Clear SKU 28909 $2.49
Approved Vendor M10-1.25x70 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26958 $2.39
Approved Vendor M10-1.25x80 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26982 $2.63
Approved Vendor M10-1.25x90 Class 10.9 JIS Hex Flange Bolts Zinc Clear SKU 26908 $3.10
Approved Vendor M10-1.50x20 Class 10.9 Hex Cap Screws Zinc Yellow SKU 27137 $0.97
Approved Vendor M10-1.50x25 Class 10.9 Hex Cap Screws Zinc Yellow SKU 27026 $1.08

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