1-64 x 1 1/4 Alloy Steel Socket Head Cap Screw helps maintenance and engineering teams source an alloy steel internal-hex screw with verified head-size data. The exact 1-64 x 1 1/4 size helps buyers align the fastener with service work where the exact thread and length are already defined. Common uses include power transmission, engineering departments, and automation systems, where internal hex installation helps keep the joint accessible. 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: 1-64 Length: 1 1/4 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.