4-40 x 3/4 316 Stainless Steel Button Head Socket Cap Screw provides a rounded button-head form for assemblies that need lower head projection while keeping the head visible and accessible. The button-head design gives engineers a compact rounded profile, a broad bearing surface, and internal hex drive access, while the 316 stainless steel material is selected where additional corrosion resistance is needed compared with general-purpose stainless grades.

Typical applications include packaging machinery and industrial automation, where reduced head projection helps limit interference near guards, rails, and moving components. It can also serve high-humidity equipment and valve enclosures, where the head geometry keeps exposed hardware smooth while preserving socket access. The button-head geometry is different from a standard socket head cap screw: it keeps a lower, rounded profile while still providing socket engagement.

For the 4-40 thread and 3/4 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. Use the verified head dimensions below when checking surface projection, socket access, and replacement fit.

Technical Highlights

• Material: 316 Stainless Steel
• Thread Size: 4-40
• Length: 3/4 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.