0-80 x 1 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 replacement sourcing without changing the specified size when machine frames and brackets cannot accept a substitute fastener. Industrial buyers may specify it for engineering departments, industrial facilities, and power transmission where head geometry and drive access need to be predictable. Verified head dimensions and hex key size help engineering departments check fit before ordering. Those verified dimensions support counterbore checks, tool selection, and replacement fastener review. Technical Highlights Material: Alloy Steel Thread: 0-80 Length: 1 1/4 in. Nominal Body Diameter: .060 in. Head Diameter: 0.091 in. min / 0.096 in. max Head Height: 0.057 in. min / 0.060 in. max Hex Key Size: 0.050 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.