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Use the 5/16-18 x 5/8 18-8 stainless hex head cap screw when the assembly calls for side wrench access and a general-purpose bolt pattern. In this size range it is treated as a hex head cap screw, with the hex head driven by external tooling rather than an internal socket.

Common application reviews include machinery guards, side-mounted brackets, and serviceable equipment joints. The hex head format keeps the drive outside the workpiece, which can simplify inspection and service in exposed assemblies.

18-8 stainless steel is an 18% chromium and 8% nickel austenitic stainless material used for ordinary atmosphere, moisture exposure, washdown, and clean appearance. Cold Headers helps buyers match uncommon lengths, older drawings, and replacement sizes without changing the protected SKU data.

Technical Highlights

  • Material: 18-8 Stainless Steel
  • Thread Size: 5/16-18
  • Length: 5/8 in.
  • Head Style: Hex
  • Drive: External Hex (wrench or socket driven)
  • Width Across Flats: 0.922-0.938 in.
  • Wrench Size: 15/16 in.
  • Head Height: 0.378-0.403 in.
  • Dimensional Standard: ASME B18.2.1
  • Material Standard: ASTM F593

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

Unit of Measure

Specifications

Brands

 N/A Cold Headers, Inc.

Diameter

 N/A 5/16-18

Length

 N/A 5/8 in

Maximum Width Across the Flats

 N/A 0.938 in

Minimum Width Across the Flats

 N/A 0.922 in

Maximum Width Across Corners

 N/A 1.083 in

Minimum Width Across Corners

 N/A 1.051 in

Maximum Head Height

 N/A 0.403 in

Minimum Head Height

 N/A 0.378 in

Material

 N/A 18-8 Stainless Steel

Quantity

 N/A 100

Package Type

 N/A Box

Search

 N/A SSHHCMS.5/16-18.5/8

Note

Note

 N/A Less Than Package Quantity Specified Plus 25%.