4-40 x 1 1/2 Alloy Steel Socket Head Cap Screw with Nylon Insert supports OEM machinery and tooling where a nylon insert can add prevailing-torque resistance to the joint. The insert feature should be matched to the mating hardware and service conditions specified for the assembly. It is a practical option when purchasing teams want a socket-drive fastener with an integrated nylon insert feature. Cold Headers also identifies this nylon insert socket head cap screw family with the 1960 Series. The 4-40 x 1 1/2 size supports exact catalog selection for machine guards, equipment covers, panels, brackets, and manufacturing workcells. For engineers, OEM manufacturers, purchasing managers, and maintenance professionals, this alloy steel part helps match the fastener to the assembly without changing the locked dimensions. Industrial distributors, purchasing teams, maintenance professionals, and machine builders are common sourcing contexts for this product family. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.