3-56 x 1 Alloy Steel Socket Head Cap Screw gives engineers an internal-hex fastener for mechanical joints where socket engagement and dimensional consistency matter. The size callout supports repair work tied to an existing fastener callout when guarding and housings cannot accept a substitute fastener. The screw is useful across manufacturing cells, processing equipment, and machine tools when a compact internal-hex fastener is required. Alloy steel supports strength-focused fastening where clamp load and repeatable assembly are important. The combination of product name, size, material, and verified head data improves search clarity for engineers and buyers. Technical Highlights Material: Alloy Steel Thread: 3-56 Length: 1 in. Nominal Body Diameter: .099 in. Head Diameter: 0.154 in. min / 0.161 in. max Head Height: 0.095 in. min / 0.099 in. max Hex Key Size: 5/64 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.