12-28 x 3 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 guards and access panels where maintenance crews can remove covers without extra external wrench clearance. It also supports automation equipment and conveyor assemblies when the compact head profile helps protect nearby moving components. Unlike a standard socket head cap screw, the button head emphasizes a lower rounded profile and broader exposed head for applications that benefit from that geometry.

For drawings using the 12-28 thread and 3 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 fit checks, tool access planning, and replacement verification.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 12-28
• Length: 3 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.