7/8-9 x 4 1/2 Alloy Steel Socket Head Cap Screw gives engineers an internal-hex fastener for mechanical joints where socket engagement and dimensional consistency matter. This size keeps the specified 7/8-9 thread and 4 1/2 in. length visible for matching drawings and maintenance records. The screw is useful across robotics, precision assemblies, and fixture design when a compact internal-hex fastener is required. Alloy steel supports strength-focused fastening where clamp load and repeatable assembly are important. The result is a clear alloy steel socket head cap screw listing for purchasing review and procurement. Technical Highlights Material: Alloy Steel Thread: 7/8-9 Length: 4 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.