3/8 x 4 1/2 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 important engineering feature is the shoulder, which supports positioning and movement while the threaded end retains the fastener. Typical applications include tool and die work, mold-related fixtures, guide mechanisms, and service parts. The nylon insert is useful in assemblies where a shoulder screw or stripper bolt must stay seated while nearby components move or cycle. Engineers can use the shoulder-size pair to match the bearing surface and travel requirement without changing the dimensional convention. 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.