Hobson UNC Button Head Socket Screw, 3/8" / 1 1/2"

The Hobson UNC button head socket screw has a UNC (Unified National Coarse) thread and is alloy steel, plain finish. There are 20 items: #10-24 to 1/2", in lengths from 3/8" to 3". Head style: BHCS, Button Head Cap Screw.

The head is low and domed, with a socket drive. UNC means Unified National Coarse Thread and TPI means threads per inch. It changes with the size and length.

Where this product is used

• Machine guards and enclosures where a rounded head will not snag clothing or hands
• Control panels and cabinet covers that are removed for access
• Light-duty fixing where the taller head of a cap screw would be in the way
• Dry indoor machinery, tooling and equipment

Features

• 20 items: #10-24 to 1/2"
• UNC thread, button head socket screw
• Alloy steel
• Plain finish
• Pack quantity shown for each item
• Uncoated plain steel: paint, oil or enclose it for protection
• Alloy steel construction

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.

A plain finish means bare steel with only a light oil film on it. It will rust quickly in damp conditions. 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. Plain alloy steel socket screws are the normal choice for tooling and machine building, where the parts are usually oiled or enclosed.

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. Fasteners are not lifting rated unless marked.

Related socket screws: Hobson UNC Button Head Socket Screw, Alloy Steel, Zinc, 1/4" to 3/8", Hobson UNF Button Head Socket Screw, Alloy Steel, Plain, 1/4" and 5/16" and Hobson UNC Socket Head Cap Screw, Alloy Steel, Plain, #4-40 to 1-1/2".