4-40 x 7/8 Alloy Steel Flat Head Socket Cap Screw helps solve clearance and snag-point issues on panels, guards, and fixture plates that require a flat installed face. The internal hex drive allows installation from above the workpiece, which is helpful in compact equipment where external wrench clearance is limited.

Engineers specify this style for automation equipment, robotic tooling, conveyor systems, and packaging machinery that benefit from reduced head projection. As an alloy steel socket fastener, it is selected for industrial assemblies that require a durable internal-hex screw where 82-degree countersunk geometry and socket-drive access are important. The internal hex drive supports top-side socket engagement where side access is limited.

For this 4-40 thread and 7/8 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers supports exact-size sourcing for specialty socket products and uncommon lengths used in industrial maintenance and production work.

Technical Highlights

• Material: Alloy Steel
• Thread Size: 4-40
• Length: 7/8 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.