Hex Bolts & Cap Screws

2,000+ products

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 20

• Approved Vendor 3/8-16x2" Grade 8 Serrated Hex Flange Bolts Zinc Clear SKU 22998 $1.61
• Approved Vendor 3/8-16x2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 22999 $0.71
• Approved Vendor 3/8-16x2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23000 $1.31
• Approved Vendor 3/8-16x2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23001 $1.00
• Approved Vendor 3/8-16x2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23002 $0.90
• Approved Vendor 3/8-16x2" Stainless Steel Hex Cap Screws Bolts SKU 1162 $1.32
• Approved Vendor 3/8-16x2-1/2" Brass Hex Tap Bolts Full Thread SKU 23016 $9.09
• Approved Vendor 3/8-16x2-1/2" Grade 5 Hex Flange Bolts Zinc Clear SKU 23017 $1.63
• Approved Vendor 3/8-16x2-1/2" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23019 $1.64
• Approved Vendor 3/8-16x2-1/2" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23020 $2.33
• Approved Vendor 3/8-16x2-1/2" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 23021 $2.74
• Approved Vendor 3/8-16x2-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23022 $0.90
• Approved Vendor 3/8-16x2-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23023 $1.58
• Approved Vendor 3/8-16x2-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23024 $1.26
• Approved Vendor 3/8-16x2-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23025 $1.06
• Approved Vendor 3/8-16x2-1/4" Brass Hex Tap Bolts Full Thread SKU 23033 $8.31
• Approved Vendor 3/8-16x2-1/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23035 $1.18
• Approved Vendor 3/8-16x2-1/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23036 $2.16
• Approved Vendor 3/8-16x2-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23037 $0.81
• Approved Vendor 3/8-16x2-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23038 $1.51
• Approved Vendor 3/8-16x2-1/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23039 $1.19
• Approved Vendor 3/8-16x2-1/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23040 $1.02
• Approved Vendor 3/8-16x2-1/4" Stainless Steel Hex Cap Screws Bolts SKU 1163 $1.44
• Approved Vendor 3/8-16x2-3/4" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23047 $1.33
• Approved Vendor 3/8-16x2-3/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23048 $2.50
• Approved Vendor 3/8-16x2-3/4" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 23049 $2.94
• Approved Vendor 3/8-16x2-3/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23050 $0.98
• Approved Vendor 3/8-16x2-3/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23051 $1.93
• Approved Vendor 3/8-16x2-3/4" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23052 $1.48
• Approved Vendor 3/8-16x2-3/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23053 $1.24
• Approved Vendor 3/8-16x2-3/4" Stainless Steel Hex Cap Screws Bolts SKU 1165 $1.72
• Approved Vendor 3/8-16x3" Brass Hex Tap Bolts Full Thread SKU 23062 $10.68
• Approved Vendor 3/8-16x3" Grade 5 Serrated Hex Flange Bolts Zinc Clear SKU 23064 $1.88
• Approved Vendor 3/8-16x3" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23065 $2.69
• Approved Vendor 3/8-16x3" Grade 8 Hex Flange Frame Bolts Zinc Yellow SKU 23066 $3.16
• Approved Vendor 3/8-16x3" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23067 $1.07
• Approved Vendor 3/8-16x3" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23068 $1.86
• Approved Vendor 3/8-16x3" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23069 $1.55
• Approved Vendor 3/8-16x3" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23070 $1.25
• Approved Vendor 3/8-16x3-1/2" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23079 $1.21
• Approved Vendor 3/8-16x3-1/2" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23080 $2.33
• Approved Vendor 3/8-16x3-1/2" Hex Head Cap Screws Grade 8 Zinc Yellow SKU 23081 $1.80
• Approved Vendor 3/8-16x3-1/2" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23082 $1.48
• Approved Vendor 3/8-16x3-1/2" Stainless Steel Hex Cap Screws Bolts SKU 1167 $2.19
• Approved Vendor 3/8-16x3-1/4" Grade 8 Hex Flange Frame Bolts Phos & Oil SKU 23085 $2.43
• Approved Vendor 3/8-16x3-1/4" Hex Cap Screws Grade 5 Bolts Zinc Clear SKU 23086 $1.19
• Approved Vendor 3/8-16x3-1/4" Hex Head Cap Screws Grade 8 USA Zinc Yellow SKU 23087 $2.30
• Approved Vendor 3/8-16x3-1/4" Hex Tap Bolts Grade 5 Full Thread Zinc SKU 23088 $1.50

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