4-40 x 1/4 18-8 Stainless Steel Button Head Socket Cap Screw fits assemblies where reduced head projection and a smooth exposed appearance help protect nearby components or operators. The relatively broad head can be helpful on covers, guards, and panels where the fastener remains visible. The internal hex drive supports socket-key installation where external wrenching space is limited.

Typical applications include instrumentation and commercial equipment, where the stainless material provides a clean look for visible or frequently handled hardware. It can also serve machine covers and equipment housings, where internal hex access supports installation where external wrench clearance is limited. The rounded head profile is useful on visible or frequently handled assemblies.

The stainless construction supports high-humidity industrial service, control equipment, and general machinery without overstating the material's corrosion performance. For the 4-40 thread and 1/4 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in.

Technical Highlights

• Material: 18-8 Stainless Steel
• Thread Size: 4-40
• Length: 1/4 in.
• Nominal Body Diameter: #4 (.112 in.)
• Head Diameter: 0.201-0.213 in.
• Head Height: 0.051-0.059 in.
• Hex-Key Size: 1/16 in.
• Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.