4-40 x 3 Alloy Steel Socket Head Cap Screw provides a strength-focused alloy steel socket cap screw option for mechanical assemblies requiring this exact size. For machine frames and brackets, the 4-40 thread and 3 in. length help confirm the correct socket cap screw before installation. Industrial buyers may specify it for maintenance shops, power transmission, and tooling where head geometry and drive access need to be predictable. Internal hex drive access helps installation in compact assemblies, guards, housings, and fixture plates. The result is a clear alloy steel socket head cap screw listing for purchasing review and procurement. Technical Highlights Material: Alloy Steel Thread: 4-40 Length: 3 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.