5-40 x 3 1/2 Alloy Steel Socket Head Cap Screw helps maintenance and engineering teams source an alloy steel internal-hex screw with verified head-size data. With a 5-40 thread and 3 1/2 in. length, it fits counterbored mounting points where size interchangeability matters. Common uses include packaging machinery, automation systems, and engineering departments, where internal hex installation helps keep the joint accessible. Internal hex drive access helps installation in compact assemblies, guards, housings, and fixture plates. This exact size supports industrial hardware, repair, and production requirements. Technical Highlights Material: Alloy Steel Thread: 5-40 Length: 3 1/2 in. Nominal Body Diameter: .125 in. Head Diameter: 0.198 in. min / 0.205 in. max Head Height: 0.121 in. min / 0.125 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.