5/16-18 x 3/8 18-8 Stainless Steel Flat Head Cap Screw with Nylon Insert is measured overall, so the listed length includes the flat head. Flat head screw lengths are measured overall, head included, so this listed length is the total installed screw length. The 82-degree flat head needs a matching countersink cut cleanly and concentrically so the cone bears correctly and the head seats true.
In food equipment surfaces, wipe-down panels, or stainless guards, the internal hex drive supports top-side installation after the countersink is prepared. Where strength matters more than stainless material, Alloy Steel Flat Head Socket Cap Screws with Nylon Insert may be the better route.
Slight magnetism from cold working can be normal for 18-8 stainless, so final material selection should reflect the assembly conditions. For supported flat head cap-screw requests, nylon inserts are installed in-house at the Chicago facility.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
