Specify 4-40 x 4 1/2 18-8 Stainless Steel Hex Head Cap Screw when thread, length, material, and external hex drive must match an existing bill of materials. 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 pump bases, flanges, and plant-service hardware. 18-8 stainless may pick up slight magnetism from cold working, which is normal for this austenitic stainless material.
18-8 stainless steel is an 18% chromium and 8% nickel austenitic stainless material used for ordinary atmosphere, moisture exposure, washdown, and clean appearance. When standard catalog searches are too broad, Cold Headers supports precise sourcing for stainless fasteners and related socket products.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
