4-40 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. The 4-40 thread and 1 1/4 in. length support service work where the exact thread and length are already defined in tooling plates. Common uses include fixture design, production lines, and maintenance shops, where internal hex installation helps keep the joint accessible. The dimensional highlights make the listing more useful for maintenance shops and industrial distribution teams. The combination of product name, size, material, and verified head data improves search clarity for engineers and buyers. Technical Highlights Material: Alloy Steel Thread: 4-40 Length: 1 1/4 in. Nominal Body Diameter: .112 in. Head Diameter: 0.176 in. min / 0.183 in. max Head Height: 0.108 in. min / 0.112 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.