4-40 x 1/8 Alloy Steel Socket Head Cap Screw is specified when a machine assembly needs a high-strength alloy steel socket screw with predictable head and drive geometry. The exact 4-40 x 1/8 size helps buyers align the fastener with stockroom identification and purchasing review. It is frequently used in maintenance repair, manufacturing plants, and assembly equipment when socket engagement is preferred over external-wrench access. The dimensional highlights make the listing more useful for maintenance shops and industrial distribution teams. Those verified dimensions support counterbore checks, tool selection, and replacement fastener review. Technical Highlights Material: Alloy Steel Thread: 4-40 Length: 1/8 in. Nominal Body Diameter: .112 in. Head Diameter: 0.176 in. min / 0.183 in. max Head Height: 0.108 in. min / 0.112 in. max Hex Key Size: 3/32 Drive Type: Internal hex socket Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.