1/4-20 x 1 1/4 Alloy Steel Flat Head Socket Cap Screw with Nylon Insert helps engineers keep panels and covers smooth while adding resistance to loosening from vibration or motion. Alloy steel construction and internal hex drive access support machine-building applications that still require practical installation. The insert feature should be matched to the mating hardware and service conditions specified for the assembly. The 1/4-20 x 1 1/4 size supports exact catalog selection for robotics, packaging machinery, inspection fixtures, and serviceable machine components. 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. Automation systems, tooling plates, machine frames, and engineered fastening locations 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.