5-40 x 1 1/2 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 replacement sourcing without changing the specified size when tooling plates cannot accept a substitute fastener. The screw is useful across assembly equipment, maintenance shops, and precision assemblies when a compact internal-hex fastener is required. Verified head dimensions and hex key size help engineering departments check fit before ordering. The technical highlight block below retains the verified head diameter, head height, body diameter, and hex key data. Technical Highlights Material: Alloy Steel Thread: 5-40 Length: 1 1/2 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.