For drawings calling out 4-40 x 3, 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 machine 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. 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: 4-40
• Length: 3 in.
• Head Style: Hex
• Drive: External Hex (wrench or socket driven)

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.