Hobson UNC Button Head Socket Screw, 1/4" / 3/4"

The Hobson UNC button head socket screw has a UNC (Unified National Coarse) thread and is alloy steel, zinc finish. There are 4 items: 1/4" to 3/8", in lengths from 3/4" to 1". 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. All items are supplied as a box of 100.

Where this product is used

• Low-profile fixing where a smooth rounded head is wanted, such as guards, covers and panels
• Control panels and cabinet covers that are removed for access
• Replacing button head screws of the same thread form, diameter and length
• Interior frames and equipment where the part is kept out of the weather
• The 4 items cover diameters from 1/4" to 3/8" and lengths from 3/4" to 1", confirm the size against your drawing before ordering

Features

• 4 items: 1/4" to 3/8"
• UNC thread, button head socket screw
• Alloy steel
• Zinc finish
• Pack quantity shown for each item
• Zinc plated finish, for indoor and sheltered locations
• 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.

Zinc plating suits workshops, enclosed machinery and interior fit-out. Because the electroplated coating is thin, it is generally unsuitable for outdoor exposure and does not meet treated-timber requirements (not suitable for treated pine). Keep zinc plated parts for the dry side of the job, and use hot dip galvanised or 316 stainless where moisture, weather or salt air are involved.

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, Plain, #10-24 to 1/2", 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".