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5/16-18 x 3/8 18-8 Stainless Steel Hex Head Cap Screw is an externally driven fastener for wrench or socket installation from the side of the head. 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 outdoor hardware, equipment covers, and access panels. 18-8 stainless may pick up slight magnetism from cold working, which is normal for this austenitic stainless material.

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: 3/8 in.
  • Head Style: Hex
  • Drive: External Hex (wrench or socket driven)
  • Width Across Flats: 0.551-0.562 in.
  • Wrench Size: 9/16 in.
  • Head Height: 0.226-0.243 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 3/8 in

Maximum Width Across the Flats

 N/A 0.562 in

Minimum Width Across the Flats

 N/A 0.551 in

Maximum Width Across Corners

 N/A 0.650 in

Minimum Width Across Corners

 N/A 0.628 in

Maximum Head Height

 N/A 0.243 in

Minimum Head Height

 N/A 0.226 in

Material

 N/A 18-8 Stainless Steel

Quantity

 N/A 100

Package Type

 N/A Box

Search

 N/A SSHHCMS.5/16-18.3/8

Note

Note

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