Hobson UNF Socket Head Cap Screw, 1" / 2"

The Hobson UNF socket head cap screw has a UNF (Unified National Fine) thread and is alloy steel, plain finish. There are 53 items: #10-32 to 1", in lengths from 3/8" to 5". Head style: SHCS, Socket Head Cap Screw.

The head carries a socket, so the screw is driven with a key or bit instead of a spanner. UNF means Unified National Fine Thread and TPI means threads per inch. It changes with the size and length.

Where this product is used

• Machine building and tooling, where a high-strength cap screw sits recessed in a counterbored hole
• Jigs, fixtures and die sets that are assembled and re-set with a hex key
• Compact assemblies where a spanner will not fit but a hex key will
• Assemblies that will be painted, oiled or enclosed after fitting
• The 53 items cover diameters from 1/4" to 1" and lengths from 3/8" to 5", confirm the size against your drawing before ordering

Features

• 53 items: #10-32 to 1"
• UNF thread, socket head cap screw
• Alloy steel
• Plain finish
• Pack quantity shown for each item
• Uncoated plain steel: paint, oil or enclose it for protection
• Made from alloy steel

Key specifications

Choosing the right option

Choose the thread form first: the screw must match its nut or tapped hole in thread form, diameter and pitch.

These socket head cap screws are plain steel, with no coating beyond a light oil film, so they rust quickly in moisture. That makes it a good fit for dry indoor work, machinery, and assemblies that are painted, oiled or enclosed after fitting. For anything outdoors or damp, choose a hot dip galvanised or 316 stainless option instead. In tooling and machine building, plain alloy socket screws are the usual choice, where the assemblies are usually oiled or enclosed.

UNF has more threads per inch than UNC for the same diameter, giving a finer adjustment. It does not mate with UNC parts. For load-critical, structural or lifting joints, confirm the fastener against the engineer's specification. Fasteners are not lifting rated unless marked.

Related socket screws: Hobson UNC Socket Head Cap Screw, Alloy Steel, Plain, #4-40 to 1-1/2", Hobson UNC Socket Head Cap Screw, Alloy Steel, Zinc, 1/4" to 5/8" and Hobson UNC Button Head Socket Screw, Alloy Steel, Plain, #10-24 to 1/2".