5/8-18 x 5 1/2 Alloy Steel Flat Head Socket Cap Screw supports flush-mounted fastening in equipment where raised hardware could interfere with covers or moving parts. The internal hex drive allows installation from above the workpiece, which is helpful in compact equipment where external wrench clearance is limited.

The design is well suited to inspection fixtures, machine frames, material-handling equipment, and repair work that calls for a countersunk internal-hex screw. Alloy steel construction is appropriate for mechanical fastening applications where the drawing or bill of materials calls for an alloy socket screw. The internal hex drive supports top-side socket engagement where side access is limited.

For this 5/8-18 thread and 5 1/2 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: 5/8-18
• Length: 5 1/2 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.