5/16-18 x 1/2 Alloy Steel Button Head Socket Cap Screw helps machine builders secure covers, brackets, and housings while keeping the head smooth and accessible. The alloy steel construction supports manufacturing equipment where a smooth button head and socket engagement are required.

Common installation points include robotics and packaging machinery where internal hex drive access supports repeatable assembly work in tight spaces. It may also be specified for precision assemblies and repair work when buyers can match the listed thread and length to drawings or service records. Unlike a standard socket head cap screw, the button head emphasizes a lower rounded profile and broader exposed head for applications that benefit from that geometry.

For assemblies specified with 5/16-18 thread and 1/2 in. length, the reference head diameter is 0.527-0.547 in. and the head height is 0.152-0.166 in. The nominal body diameter and hex-key information below help maintenance and purchasing teams verify fit and tool access.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 5/16-18
• Length: 1/2 in.
• Nominal Body Diameter: 5/16 (.312 in.)
• Head Diameter: 0.527-0.547 in.
• Head Height: 0.152-0.166 in.
• Hex-Key Size: 3/16 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.