12-28 x 6 1/2 Alloy Steel Socket Head Cap Screw provides a strength-focused alloy steel socket cap screw option for mechanical assemblies requiring this exact size. The size callout supports repair work tied to an existing fastener callout when production-floor assemblies cannot accept a substitute fastener. It is frequently used in machine tools, processing equipment, and power transmission when socket engagement is preferred over external-wrench access. 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: 12-28 Length: 6 1/2 in. Nominal Body Diameter: .215 in. Head Diameter: 0.337 in. min / 0.344 in. max Head Height: 0.211 in. min / 0.215 in. max Hex Key Size: 5/32 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.