5/16 x 4 1/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert gives engineers a stripper bolt option for applications where the shoulder geometry is central to movement or location. The socket head allows internal hex drive access, while the shoulder provides the surface used by the assembly. Typical applications include industrial machinery, maintenance departments, equipment builders, and distributor sourcing. A nylon insert helps add loosening resistance where repeated motion, equipment vibration, or service conditions can work against threaded retention. Engineers can use the shoulder-size pair to match the bearing surface and travel requirement without changing the dimensional convention. The socket head shoulder screw format is well suited to serviceable machinery where access and repeatable location are both important. It is appropriate for buyers comparing shoulder screws by exact shoulder diameter, shoulder length, material, and insert feature. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.