5/16-18 x 2 1/2 Alloy Steel Button Head Socket Cap Screw fits applications where engineers want socket drive control in a rounded head rather than an external wrenching feature. The alloy steel construction fits fixture construction where a broader bearing surface and socket-drive access are part of the design.

Frequent uses include robotics and packaging machinery where internal hex drive access supports repeatable assembly work in tight spaces. It is also practical in 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.

When matching the 5/16-18 thread and 2 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 confirm fit, tool clearance, and replacement requirements.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 5/16-18
• Length: 2 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.