4-40 x 3/4 Alloy Steel Flat Head Socket Cap Screw is used where the screw head must nest into an 82-degree countersink instead of standing proud of the work surface. Its countersunk head is useful when designers want a minimal surface profile while retaining internal hex access for installation and service work.

Maintenance teams use this configuration when replacing flush socket screws on guarding, covers, conveyor hardware, and other serviceable equipment. The alloy steel material keeps the product aligned with machine-building, tooling, and industrial repair requirements that specify this fastener family. The internal hex drive supports top-side socket engagement where side access is limited.

For this 4-40 thread and 3/4 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: 4-40
• Length: 3/4 in.
• Nominal Body Diameter (B): 0.112 in.
• Head Diameter (A): 0.218-0.255 in.
• Head Height: 0.083 in.
• Hex Socket Size (J): 1/16 in.
• Minimum Key Engagement (T): 0.055 in.
• Drive Type: Internal Hex

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