5-40 x 2 1/4 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 stockroom identification and purchasing review when production-floor assemblies cannot accept a substitute fastener. Industrial buyers may specify it for tooling, assembly equipment, and fixture design where head geometry and drive access need to be predictable. Socket engagement helps technicians apply installation torque from above the head in constrained layouts. The combination of product name, size, material, and verified head data improves search clarity for engineers and buyers. Technical Highlights Material: Alloy Steel Thread: 5-40 Length: 2 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.