3/8-16 x 1 1/4 Alloy Steel Socket Head Cap Screw provides a strength-focused alloy steel socket cap screw option for mechanical assemblies requiring this exact size. The size callout supports bill-of-material consistency when counterbored mounting points cannot accept a substitute fastener. It is frequently used in tooling, power transmission, and material handling when socket engagement is preferred over external-wrench access. The socket head form provides a cylindrical head suited to counterbores and recessed mounting pockets. This keeps the listing focused on the fastener geometry rather than broad catalog language. Technical Highlights Material: Alloy Steel Thread: 3/8-16 Length: 1 1/4 in. Nominal Body Diameter: .375 in. Head Diameter: 0.550 in. min / 0.562 in. max Head Height: 0.368 in. min / 0.375 in. max Hex Key Size: 5/16 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.