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Specify 5/16-18 x 1 18-8 Stainless Steel Hex Head Cap Screw when thread, length, material, and external hex drive must match an existing bill of materials. 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 pump skids, utility equipment, and bolted flange details. The head can be tightened with standard side-access tooling, which helps where top clearance is limited by covers or nearby components.

18-8 stainless steel is an 18% chromium and 8% nickel austenitic stainless material used for ordinary atmosphere, moisture exposure, washdown, and clean appearance. When standard catalog searches are too broad, Cold Headers supports precise sourcing for stainless fasteners and related socket products.

Technical Highlights

  • Material: 18-8 Stainless Steel
  • Thread Size: 5/16-18
  • Length: 1 in.
  • Head Style: Hex
  • Drive: External Hex (wrench or socket driven)
  • Width Across Flats: 1.469-1.500 in.
  • Wrench Size: 1 1/2 in.
  • Head Height: 0.591-0.627 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 1 in

Maximum Width Across the Flats

 N/A 1.500 in

Minimum Width Across the Flats

 N/A 1.469 in

Maximum Width Across Corners

 N/A 1.732 in

Minimum Width Across Corners

 N/A 1.675 in

Maximum Head Height

 N/A 0.627 in

Minimum Head Height

 N/A 0.591 in

Material

 N/A 18-8 Stainless Steel

Quantity

 N/A 100

Package Type

 N/A Box

Search

 N/A SSHHCMS.5/16-18.1

Note

Note

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