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For drawings calling out 5/8-11 x 4, 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 tank supports, fixture plates, and stainless brackets. 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: 5/8-11
  • Length: 4 in.
  • Head Style: Hex
  • Drive: External Hex (wrench or socket driven)
  • Width Across Flats: 0.181-0.188 in.
  • Wrench Size: 3/16 in.
  • Head Height: 0.049-0.060 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 5/8-11

Length

 N/A 4 in

Maximum Width Across the Flats

 N/A 0.188 in

Minimum Width Across the Flats

 N/A 0.181 in

Minimum Width Across Corners

 N/A 0.202 in

Maximum Head Height

 N/A 0.060 in

Minimum Head Height

 N/A 0.049 in

Material

 N/A 18-8 Stainless Steel

Quantity

 N/A 25

Package Type

 N/A Box

Search

 N/A SSHHCMS.5/8-11.4

Note

Note

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