Hobson UNC Hex Bolt, 9/16" / 2"

The Hobson UNC hex bolt range has 104 items in grade 8, plain finish: sizes 1/4" to 2", with lengths from 3/4" to 15". Grade 8 is high tensile, and corresponds to metric class 10.9. UNC means Unified National Coarse Thread and TPI means threads per inch.

Where this product is used

• Bolting steel plate, angle and flat bar together through drilled clearance holes, with a nut and washer on the far side
• Fabrication and repair work where the head can be reached with a spanner or socket
• Replacing worn or missing bolts of the same thread form, diameter and length
• Dry indoor machinery, tooling and equipment
• Heavy-duty assemblies and machine building where a high-strength fastener is wanted
• The 109 items cover diameters from 1/4" to 2" and lengths from 3/4" to 15", confirm the size against your drawing before ordering

Features

• 15 sizes: 1/4" to 2"
• Grade 8, Plain finish
• Lengths from 3/4" to 15"
• Pack quantity and part number for every item
• Proof load and minimum tensile strength
• Spanner size (A/F) by size
• Plain (uncoated) steel for dry indoor and machinery use
• Grade 8 alloy steel for heavy-duty work

Key specifications

Choosing the right option

Choose the thread form first: the nut must match the bolt in thread form, diameter and pitch. Length is measured from under the head to the end of the bolt. For a bolt and nut set: see Hobson UNC Hex Bolt and Nut, Grade 8, Plain, 5/16" to 1-1/2" x 3/4" to 10".

Plain (uncoated) steel has no corrosion protection beyond a light oil film, and it rusts quickly once moisture reaches it. It suits dry indoor jobs, machinery, and assemblies that will be painted, oiled or enclosed. Where the job is outside or damp, move to hot dip galvanised or 316 stainless.

Grade 8 is alloy steel for heavy-duty work and is marked with six radial lines on the bolt head (SAE J429 convention). Minimum tensile strength is shown against each size. UNC is the coarse inch thread form. It does not mate with UNF, so the nut or tapped hole must also be UNC. For load-critical, structural or lifting joints, confirm the fastener against the engineer's specification.

Related hex bolts: Hobson UNC Hex Bolt, Grade 8, Plain, 1/4" to 2" x 3/4" to 15", List A, Hobson UNC Hex Bolt and Nut, Grade 8, Plain, 5/16" to 1-1/2" x 3/4" to 10" and Hobson UNC Hex Bolt, Grade 5, Plain, 1/4" to 7/16" x 3/4" to 6".