5-40 x 2 Alloy Steel Socket Head Cap Screw with Nylon Insert gives machine builders a Cold Headers 1960 Series nylon insert option for socket-driven fastening points. The nylon insert provides prevailing-torque resistance that can help reduce loosening in machinery subject to vibration or repeated movement. This feature is useful for OEM equipment, automation systems, covers, guards, and service locations where joint retention matters. Cold Headers also identifies this nylon insert socket head cap screw family with the 1960 Series. The 5-40 x 2 size supports exact catalog selection for machine building, tooling, fixtures, automation equipment, and OEM machinery. 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. Robotics, packaging machinery, inspection fixtures, and serviceable machine components 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.