5/16-18 x 1 1/4 Brass Button Head Socket Cap Screw is used where reduced head projection and a clean visible appearance are important on brass hardware. Compared with taller head styles, the rounded button head can reduce snag potential on panels, covers, and handled surfaces. The material is often selected when conductivity, machinability, and appearance are more relevant than the strength profile of alloy steel.

Appropriate uses include electronic equipment and display hardware, where a decorative appearance and lower head projection help exposed hardware look intentional. It can also fit electrical assemblies and control panels, where conductivity and non-magnetic construction can be useful around selected hardware and instrumentation layouts. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 5/16-18 thread and 1 1/4 in. length, the reference head diameter is 0.527-0.547 in. and the head height is 0.152-0.166 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

• Material: Brass
• Thread Size: 5/16-18
• Length: 1 1/4 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.