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 22

• Approved Vendor 3/8-16x6" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23176 $3.20
• Approved Vendor 3/8-16x6" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23177 $2.44
• Approved Vendor 3/8-16x6" Stainless Steel Hex Cap Screws Bolts SKU 1172 $3.95
• Approved Vendor 3/8-16x6-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23178 $3.78
• Approved Vendor 3/8-16x7" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23180 $3.90
• Approved Vendor 3/8-16x7" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23181 $5.95
• Approved Vendor 3/8-16x7" Stainless Steel Hex Cap Screws Bolts SKU 1173 $5.37
• Approved Vendor 3/8-16x7-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23182 $4.55
• Approved Vendor 3/8-16x7/8" Brass Hex Tap Bolts Full Thread SKU 23186 $4.00
• Approved Vendor 3/8-16x7/8" Grade 5 Hex Flange Bolts Zinc Clear SKU 23187 $0.83
• Approved Vendor 3/8-16x7/8" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23188 $0.72
• Approved Vendor 3/8-16x7/8" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23189 $0.87
• Approved Vendor 3/8-16x7/8" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 23190 $0.96
• Approved Vendor 3/8-16x7/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23191 $0.44
• Approved Vendor 3/8-16x7/8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23192 $0.69
• Approved Vendor 3/8-16x7/8" Stainless Steel Hex Cap Screws Bolts SKU 1157 $0.72
• Approved Vendor 3/8-16x8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23193 $6.91
• Approved Vendor 3/8-24x1" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23206 $1.00
• Approved Vendor 3/8-24x1" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23207 $0.59
• Approved Vendor 3/8-24x1" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23208 $0.89
• Approved Vendor 3/8-24x1" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23209 $0.83
• Approved Vendor 3/8-24x1" Stainless Steel Hex Cap Screws Bolts SKU 1325 $1.13
• Approved Vendor 3/8-24x1-1/2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23219 $1.28
• Approved Vendor 3/8-24x1-1/2" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23220 $1.76
• Approved Vendor 3/8-24x1-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23221 $0.79
• Approved Vendor 3/8-24x1-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23222 $1.18
• Approved Vendor 3/8-24x1-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23223 $1.07
• Approved Vendor 3/8-24x1-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1327 $1.51
• Approved Vendor 3/8-24x1-1/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23234 $1.12
• Approved Vendor 3/8-24x1-1/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23235 $1.50
• Approved Vendor 3/8-24x1-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23236 $0.65
• Approved Vendor 3/8-24x1-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23237 $1.02
• Approved Vendor 3/8-24x1-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23238 $0.93
• Approved Vendor 3/8-24x1-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1326 $1.29
• Approved Vendor 3/8-24x1-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23244 $0.85
• Approved Vendor 3/8-24x1-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23245 $1.34
• Approved Vendor 3/8-24x1-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23246 $1.21
• Approved Vendor 3/8-24x1-3/4" Stainless Steel Hex Cap Screws Bolts SKU 1328 $1.72
• Approved Vendor 3/8-24x1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23256 $0.45
• Approved Vendor 3/8-24x1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23257 $0.68
• Approved Vendor 3/8-24x1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23258 $0.61
• Approved Vendor 3/8-24x1/2" Stainless Steel Hex Cap Screws Bolts SKU 1321 $0.78
• Approved Vendor 3/8-24x2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23264 $1.72
• Approved Vendor 3/8-24x2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23265 $0.99
• Approved Vendor 3/8-24x2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23266 $1.54
• Approved Vendor 3/8-24x2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23267 $1.34
• Approved Vendor 3/8-24x2" Stainless Steel Hex Cap Screws Bolts SKU 1329 $1.93
• Approved Vendor 3/8-24x2-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23272 $1.19

More in Fasteners

• Socket Head Screws
• Machine Screws
• Nuts
• Wood, Deck & Sheet Metal Screws
• Pins, Clips & Retaining Rings
• Carriage & Specialty Bolts
• Washers
• Anchors
• Threaded Rod & Studs
• Rivets