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For drawings calling out 5/16-24 x 1 1/8, this 18-8 stainless hex head fastener supports assemblies where top-drive clearance is not required. 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 general-service equipment, frames, and adjustment brackets. 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. 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: 5/16-24
  • Length: 1 1/8 in.
  • Head Style: Hex
  • Drive: External Hex (wrench or socket driven)
  • Width Across Flats: 1.631-1.688 in.
  • Head Height: 0.658-0.718 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 5/16-24

Length

 N/A 1 1/8 in

Maximum Width Across the Flats

 N/A 1.688 in

Minimum Width Across the Flats

 N/A 1.631 in

Maximum Width Across Corners

 N/A 1.949 in

Minimum Width Across Corners

 N/A 1.859 in

Maximum Head Height

 N/A 0.718 in

Minimum Head Height

 N/A 0.658 in

Material

 N/A 18-8 Stainless Steel

Quantity

 N/A 100

Package Type

 N/A Box

Search

 N/A SSHHCMS.5/16-24.1 1/8

Note

Note

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