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4-40 x 1/4 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 machine screw, with the hex head driven by external tooling rather than an internal socket.

Common application reviews include machine frames, guard panels, and bracket assemblies. External hex drive is useful when a wrench or socket can reach the head from the side and a counterbore would add unnecessary machining.

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 has supplied specialty fasteners since 1962 and supports exact-size sourcing for hard-to-find industrial hardware.

Technical Highlights

  • Material: 18-8 Stainless Steel
  • Thread Size: 4-40
  • Length: 1/4 in.
  • Head Style: Hex
  • Drive: External Hex (wrench or socket driven)
  • Width Across Flats: 0.428-0.438 in.
  • Wrench Size: 7/16 in.
  • Head Height: 0.150-0.163 in.

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 4-40

Length

 N/A 1/4 in

Maximum Width Across the Flats

 N/A 0.438 in

Minimum Width Across the Flats

 N/A 0.428 in

Maximum Width Across Corners

 N/A 0.505 in

Minimum Width Across Corners

 N/A 0.488 in

Maximum Head Height

 N/A 0.163 in

Minimum Head Height

 N/A 0.150 in

Material

 N/A 18-8 Stainless Steel

Quantity

 N/A 100

Package Type

 N/A Box

Search

 N/A SSHHCMS.4-40.1/4

Note

Note

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