1-8 x 5 1/2 Alloy Steel Socket Head Cap Screw is suited to assemblies that need an alloy steel cap screw for clamp load, service access, and compact installation. The exact 1-8 x 5 1/2 size helps buyers align the fastener with matching drawings and maintenance records. Industrial buyers may specify it for manufacturing cells, robotics, and tooling where head geometry and drive access need to be predictable. Internal hex drive access helps installation in compact assemblies, guards, housings, and fixture plates. Those verified dimensions support counterbore checks, tool selection, and replacement fastener review. Technical Highlights Material: Alloy Steel Thread: 1-8 Length: 5 1/2 in. Nominal Body Diameter: 1.000 in. Head Diameter: 1.479 in. min / 1.500 in. max Head Height: 0.988 in. min / 1.000 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.