1/2-20 x 3 1/4 Alloy Steel Flat Head Socket Cap Screw is commonly selected when a countersunk hole, clean top surface, and internal hex drive are part of the design. The flat-head profile is particularly useful around moving stock, operator contact areas, and assemblies where exposed screw heads should not project.

Typical uses include machine guarding, equipment covers, fixture plates, and tooling assemblies where a flush fastener helps keep the working surface clear. The material designation gives purchasing teams a clear match for equipment documents that call out alloy steel flat head socket cap screws. The internal hex drive supports top-side socket engagement where side access is limited.

For this 1/2-20 thread and 3 1/4 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers supports purchasing teams and engineering departments that need clear size identification for specialty socket screw requirements.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 1/2-20
• Length: 3 1/4 in.
• Nominal Body Diameter (B): 0.500 in.
• Head Diameter (A): 0.872-0.938 in.
• Head Height: 0.251 in.
• Hex Socket Size (J): 5/16 in.
• Minimum Key Engagement (T): 0.172 in.
• Drive Type: Internal Hex

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