12-28 x 1 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 machine covers and service panels where the finished head appearance is useful on exposed equipment. It is also suited to control enclosures and equipment housings when the rounded head reduces sharp edges on handled surfaces. The button-head form is specified when the fastener head remains visible or accessible and a smooth rounded profile is preferred.

For engineering layouts using 12-28 thread and 1 1/4 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 keep fit review, tool selection, and replacement ordering tied to verified reference values.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 12-28
• Length: 1 1/4 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.