The 4-40 x 1 3/4 size in 18-8 stainless is suited to hex-head fastening where frames, brackets, or guards need serviceable external drive access. 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 retrofit repairs, service records, and exact-size replacement needs. Stainless-on-stainless threads can gall when run down fast or dry; moderate installation speed and thread lubricant are prudent on larger diameters.

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 3/4 in.
• Head Style: Hex
• Drive: External Hex (wrench or socket driven)
• Width Across Flats: 2.538-2.625 in.
• Head Height: 1.054-1.134 in.

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