5/16-18 x 1 1/2 Brass Button Head Socket Cap Screw helps designers combine a compact rounded head profile with material properties useful for electrical and instrumentation work. The internal hex drive keeps the installation tool inside the head, which is useful when external wrench clearance is limited. Brass is appropriate for many low-load mechanical assemblies where corrosion resistance in general service, appearance, and electrical behavior matter.

Appropriate uses include laboratory equipment and commercial fixtures, where non-ferrous construction and a clean exposed head are often preferred over plain steel hardware. It can also fit laboratory equipment and commercial fixtures, where non-ferrous construction and a clean exposed head are often preferred over plain steel hardware. 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 1/2 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 1/2 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.