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 23

Approved Vendor 3/8-24x2-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23273 $1.94
Approved Vendor 3/8-24x2-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23274 $1.67
Approved Vendor 3/8-24x2-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1331 $2.35
Approved Vendor 3/8-24x2-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23275 $1.03
Approved Vendor 3/8-24x2-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23276 $1.77
Approved Vendor 3/8-24x2-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23277 $1.52
Approved Vendor 3/8-24x2-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1330 $2.12
Approved Vendor 3/8-24x2-3/4 Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23278 $1.28
Approved Vendor 3/8-24x2-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23279 $2.10
Approved Vendor 3/8-24x2-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23280 $1.81
Approved Vendor 3/8-24x2-3/4" Stainless Steel Hex Cap Screws Bolts SKU 1332 $2.54
Approved Vendor 3/8-24x3" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23285 $1.40
Approved Vendor 3/8-24x3" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23286 $2.28
Approved Vendor 3/8-24x3" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23287 $1.97
Approved Vendor 3/8-24x3-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23289 $1.60
Approved Vendor 3/8-24x3-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23290 $2.65
Approved Vendor 3/8-24x3-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23291 $2.30
Approved Vendor 3/8-24x3-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1334 $3.22
Approved Vendor 3/8-24x3-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23292 $1.49
Approved Vendor 3/8-24x3-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23293 $1.73
Approved Vendor 3/8-24x3-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23294 $2.82
Approved Vendor 3/8-24x3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23305 $0.94
Approved Vendor 3/8-24x3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23306 $1.34
Approved Vendor 3/8-24x3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23307 $0.52
Approved Vendor 3/8-24x3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23308 $0.77
Approved Vendor 3/8-24x3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23309 $0.71
Approved Vendor 3/8-24x3/4" Stainless Steel Hex Cap Screws Bolts SKU 1323 $0.94
Approved Vendor 3/8-24x4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23314 $1.83
Approved Vendor 3/8-24x4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23315 $2.61
Approved Vendor 3/8-24x4" Stainless Steel Hex Cap Screws Bolts SKU 1335 $3.70
Approved Vendor 3/8-24x4-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23316 $2.04
Approved Vendor 3/8-24x4-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23317 $3.36
Approved Vendor 3/8-24x4-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1336 $4.08
Approved Vendor 3/8-24x5" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23319 $2.23
Approved Vendor 3/8-24x5" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23320 $3.85
Approved Vendor 3/8-24x5" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23321 $3.20
Approved Vendor 3/8-24x5" Stainless Steel Hex Cap Screws Bolts SKU 1337 $4.47
Approved Vendor 3/8-24x5-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23322 $2.54
Approved Vendor 3/8-24x5-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23323 $4.26
Approved Vendor 3/8-24x5-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23324 $3.55
Approved Vendor 3/8-24x5-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1338 $4.93
Approved Vendor 3/8-24x5/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23330 $0.48
Approved Vendor 3/8-24x5/8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23331 $0.66
Approved Vendor 3/8-24x5/8" Stainless Steel Hex Cap Screws Bolts SKU 1322 $0.87
Approved Vendor 3/8-24x6" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23332 $2.79
Approved Vendor 3/8-24x6" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23333 $4.66
Approved Vendor 3/8-24x6" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23334 $3.83
Approved Vendor 3/8-24x6" Stainless Steel Hex Cap Screws Bolts SKU 1339 $5.42

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