5/16-18 x 7/8 Alloy Steel Button Head Socket Cap Screw is used where a rounded, lower-profile head helps keep exposed hardware compact without requiring countersinking. The alloy steel construction is suited to mechanical assemblies where the drawing calls for a low-profile rounded head and internal hex drive access.

Typical applications include equipment housings and assembly fixtures where the button head presents a clean bearing surface on visible hardware. It also supports material-handling systems and commercial equipment when the lower rounded profile helps limit snag points. The button-head form is specified when the fastener head remains visible or accessible and a smooth rounded profile is preferred.

For drawings using the 5/16-18 thread and 7/8 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 support fit checks, tool access planning, and replacement verification.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 5/16-18
• Length: 7/8 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.