4-40 x 1 1/2 316 Stainless Steel Flat Head Socket Cap Screw helps engineers solve clearance problems on covers, guards, and housings where protruding fasteners are undesirable. By sitting into the countersink, the fastener helps maintain clean lines on panels, covers, and architectural hardware. Its chloride resistance is valuable for marine hardware, pump covers, valve covers, and exposed equipment panels. The drive style gives OEM manufacturers a repeatable installation method for countersunk stainless hardware. The product suits coastal equipment, valve covers, OEM housings, and instrument panels where corrosion resistance matters. OEM manufacturers can document the exact size while keeping stainless flat head hardware consistent across builds. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.