12-28 x 2 1/2 Alloy Steel Button Head Socket Cap Screw provides a button-head geometry for assemblies that need a finished appearance and internal hex drive engagement. The alloy steel construction works in maintenance applications where replacement hardware must match the specified button-head geometry.

Engineers may use it on equipment housings and assembly fixtures where the button head presents a clean bearing surface on visible hardware. This geometry also fits 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.

When checking fit for the 12-28 thread and 2 1/2 in. length, the reference head diameter is 0.383-0.413 in. and the head height is 0.104-0.117 in. The nominal body diameter and hex-key information below support counterbore planning, socket access, and replacement matching.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 12-28
• Length: 2 1/2 in.
• Nominal Body Diameter: #12 (.215 in.)
• Head Diameter: 0.383-0.413 in.
• Head Height: 0.104-0.117 in.
• Hex-Key Size: Hex-key size may be 1/8 in. or 5/32 in., depending on manufacturer.
• 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.