5/16-18 x 1/4 Alloy Steel Button Head Socket Cap Screw is commonly specified when designers need internal-hex access with a broad, finished head profile. The alloy steel construction serves automation systems where reduced snag potential and internal hex drive access are useful.

It is commonly used on control enclosures and equipment housings where the rounded head reduces sharp edges on handled surfaces. It is also suited to robotics and packaging machinery when internal hex drive access supports repeatable assembly work in tight spaces. This head style is different from a standard socket head cap screw: it trades the taller cylindrical head form for a rounded button profile used on exposed assemblies.

For engineering layouts using 5/16-18 thread and 1/4 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 keep fit review, tool selection, and replacement ordering tied to verified reference values.

Technical Highlights

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

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.