3/8-16 x 1 1/4 Brass Button Head Socket Cap Screw is selected for exposed fastening points where appearance, machinability, and internal hex access matter more than high-strength fastening. 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 architectural hardware and commercial brass components, where the rounded head provides a finished appearance on visible covers and trim. It can also fit maintenance work and assembly operations, where the exact thread and length help match drawings, repair lists, and existing brass hardware. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 3/8-16 thread and 1 1/4 in. length, the reference head diameter is 0.636-0.656 in. and the head height is 0.185-0.199 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

• Material: Brass
• Thread Size: 3/8-16
• Length: 1 1/4 in.
• Nominal Body Diameter: 3/8 (.375 in.)
• Head Diameter: 0.636-0.656 in.
• Head Height: 0.185-0.199 in.
• Hex-Key Size: 7/32 in.
• Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.