Hobson UNC Flat Head Socket Screw, 1" / 2"

The Hobson UNC flat head socket screw has a UNC (Unified National Coarse) thread and is alloy steel, plain finish. There are 49 items: #10-24 to 1", in lengths from 3/8" to 4". Head style: FHCS, Flat Head (Countersunk) Cap Screw.

The head is tapered so that it sits flush in a countersunk hole. UNC means Unified National Coarse Thread and TPI means threads per inch. It changes with the size and length.

Where this product is used

• Fixing into countersunk holes so the head sits flush, as in jigs, fixtures and covers
• Machine covers and wear plates where a raised head would foul a moving part
• Replacing flat head (countersunk) socket screws of the same thread form, diameter and length
• Dry indoor machinery, tooling and equipment
• The 49 items cover diameters from 1/4" to 1" and lengths from 3/8" to 4", confirm the size against your drawing before ordering

Features

• 49 items: #10-24 to 1"
• UNC thread, flat head socket screw
• Alloy steel
• Plain finish
• Pack quantity shown for each item
• Plain finish: suited to dry indoor, oiled, painted or enclosed use
• Material: 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.

Plain steel carries no protective coating apart from a light oil film, which is why it rusts quickly if it gets wet. Keep plain parts for dry indoor use, machinery and assemblies that get painted, oiled or enclosed. Outdoors or in damp areas, a hot dip galvanised or 316 stainless alternative is the better choice. In tooling and machine building, plain alloy socket screws are the usual choice, where the assemblies are usually oiled or enclosed.

The thread is UNC (Unified National Coarse), the general-purpose inch thread. Use it with UNC nuts and tapped holes only. 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 BSW Flat Head Socket Screw, Alloy Steel, Plain, 1/4" to 5/8", Hobson UNF Countersunk Hex Socket Screw, Plain, 1/4" to 1/2" and Hobson UNC Flat Head Socket Screw, Zinc, 3/8 x 1", Box of 100.