5-40 x 1 1/4 Alloy Steel Socket Head Cap Screw is specified when a machine assembly needs a high-strength alloy steel socket screw with predictable head and drive geometry. This size keeps the specified 5-40 thread and 1 1/4 in. length visible for bill-of-material consistency. Common uses include manufacturing cells, maintenance repair, and production lines, where internal hex installation helps keep the joint accessible. Verified head dimensions and hex key size help engineering departments check fit before ordering. The result is a clear alloy steel socket head cap screw listing for purchasing review and procurement. Technical Highlights Material: Alloy Steel Thread: 5-40 Length: 1 1/4 in. Nominal Body Diameter: .125 in. Head Diameter: 0.198 in. min / 0.205 in. max Head Height: 0.121 in. min / 0.125 in. max Hex Key Size: 3/32 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.