7/8-9 x 3 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 replacement sourcing without changing the specified size when tooling plates cannot accept a substitute fastener. Applications often include precision assemblies, processing equipment, and material handling, especially where counterbored or close-clearance mounting is required. 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: 7/8-9 Length: 3 1/2 in. Nominal Body Diameter: .875 in. Head Diameter: 1.293 in. min / 1.312 in. max Head Height: 0.864 in. min / 0.875 in. max Hex Key Size: 3/4 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.