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For drawings calling out 1/4-28 x 5/8, 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 food processing skids, washdown equipment, and packaging lines. For washdown or outdoor general-service use, review the actual environment and avoid assuming 18-8 is appropriate for severe chloride exposure.

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 serves maintenance and production needs where exact-size stainless hardware matters more than generic substitution.

Technical Highlights

  • Material: 18-8 Stainless Steel
  • Thread Size: 1/4-28
  • 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 1/4-28

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.1/4-28.5/8

Note

Note

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