5/8-18 x 1 1/4 Alloy Steel Flat Head Socket Cap Screw provides an alloy steel flat head option for machine components designed around countersunk socket screws. Its 82-degree countersunk head is useful when designers want a minimal surface profile while retaining internal hex access for installation and service work.

Common applications include electronics enclosures, access panels, tooling stations, and assembly systems where a smooth exposed face supports safe handling. 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 5/8-18 thread and 1 1/4 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers focuses on difficult-to-find socket products where exact thread, length, and head style matter to the application.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 5/8-18
• Length: 1 1/4 in.
• Nominal Body Diameter (B): 0.625 in.
• Head Diameter (A): 1.112-1.188 in.
• Head Height: 0.324 in.
• Hex Socket Size (J): 3/8 in.
• Minimum Key Engagement (T): 0.220 in.
• Drive Type: Internal Hex

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