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 21

• Approved Vendor 3/8-16x3-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23089 $1.34
• Approved Vendor 3/8-16x3-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23090 $2.59
• Approved Vendor 3/8-16x3-3/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23091 $1.73
• Approved Vendor 3/8-16x3/4" Grade 5 Serrated Hex Flange Bolts Zinc Yellow SKU 23093 $0.72
• Approved Vendor 3/8-16x3/4" 18-8 Stainless Steel Serrated Hex Flange Bolts SKU 2095 $1.47
• Approved Vendor 3/8-16x3/4" Brass Hex Tap Bolts Full Thread SKU 23105 $3.10
• Approved Vendor 3/8-16x3/4" Grade 5 Hex Flange Bolts Zinc Clear SKU 23106 $0.80
• Approved Vendor 3/8-16x3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23108 $0.78
• Approved Vendor 3/8-16x3/4" Grade 5 Serrated Hex Large Flange Bolts Zinc Clear SKU 23109 $0.89
• Approved Vendor 3/8-16x3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23110 $1.11
• Approved Vendor 3/8-16x3/4" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 23111 $1.37
• Approved Vendor 3/8-16x3/4" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 23112 $0.91
• Approved Vendor 3/8-16x3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23113 $0.39
• Approved Vendor 3/8-16x3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23114 $0.66
• Approved Vendor 3/8-16x3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23115 $0.60
• Approved Vendor 3/8-16x3/4" Stainless Steel Hex Cap Screws Bolts SKU 1156 $0.67
• Approved Vendor 3/8-16x4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23128 $3.37
• Approved Vendor 3/8-16x4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23129 $1.40
• Approved Vendor 3/8-16x4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23130 $2.65
• Approved Vendor 3/8-16x4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23131 $2.05
• Approved Vendor 3/8-16x4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23132 $1.70
• Approved Vendor 3/8-16x4" Stainless Steel Hex Cap Screws Bolts SKU 1168 $2.48
• Approved Vendor 3/8-16x4-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23139 $1.55
• Approved Vendor 3/8-16x4-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23140 $3.10
• Approved Vendor 3/8-16x4-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23141 $2.29
• Approved Vendor 3/8-16x4-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23142 $1.95
• Approved Vendor 3/8-16x4-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1169 $2.81
• Approved Vendor 3/8-16x4-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23143 $1.58
• Approved Vendor 3/8-16x5" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23149 $3.98
• Approved Vendor 3/8-16x5" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23150 $1.73
• Approved Vendor 3/8-16x5" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23151 $3.55
• Approved Vendor 3/8-16x5" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23152 $2.51
• Approved Vendor 3/8-16x5" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23153 $2.03
• Approved Vendor 3/8-16x5" Stainless Steel Hex Cap Screws Bolts SKU 1170 $3.23
• Approved Vendor 3/8-16x5-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23155 $2.05
• Approved Vendor 3/8-16x5-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23156 $4.07
• Approved Vendor 3/8-16x5-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23157 $2.92
• Approved Vendor 3/8-16x5-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23158 $2.37
• Approved Vendor 3/8-16x5-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1171 $3.58
• Approved Vendor 3/8-16x5/8" Grade 5 Serrated Hex Flange Bolts Zinc Yellow SKU 23159 $0.67
• Approved Vendor 3/8-16x5/8" Grade 5 Hex Flange Bolts Zinc Clear SKU 23165 $0.75
• Approved Vendor 3/8-16x5/8" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23166 $0.65
• Approved Vendor 3/8-16x5/8" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23167 $0.77
• Approved Vendor 3/8-16x5/8" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23168 $0.39
• Approved Vendor 3/8-16x5/8" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23169 $0.59
• Approved Vendor 3/8-16x5/8" Stainless Steel Hex Cap Screws Bolts SKU 1155 $0.65
• Approved Vendor 3/8-16x6" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23174 $2.24
• Approved Vendor 3/8-16x6" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23175 $4.39

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