5/16 x 3 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert supports assemblies that need a bearing surface, pivot point, spacer, stop, or locating feature in one fastener. The socket head allows internal hex drive access, while the shoulder provides the surface used by the assembly. Typical applications include machine building, production fixtures, repair programs, and replacement applications. The nylon insert supports resistance to loosening while the shoulder continues to provide the bearing, guide, spacer, or locating surface. Maintenance professionals may use this style when worn guide, stop, spacer, or pivot hardware needs a direct shoulder-size replacement. This product family helps support controlled movement in fixtures, guides, pivots, and stops. Common sourcing contexts include replacement maintenance, fixture construction, and OEM production support. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.