3/8 x 5 1/2 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert is a nylon-insert stripper bolt for assemblies where the shoulder controls movement and the thread anchors the screw. The nylon pellet belongs in the threaded end, so it adds prevailing torque without changing the working shoulder surface. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

Use this size for cam followers, linkage pivots, moving stops, and serviceable machine linkages when the drawing calls for a bearing shoulder plus a retained threaded end. The nylon element limits service temperature compared to an all-metal screw; ask about plain stripper bolts for hot tooling. When the application calls for stainless material instead of alloy steel, review 18-8 Stainless Steel Stripper Bolts.

Cold Headers supports die repair, OEM sourcing, and distributor requests for uncommon shoulder lengths and nylon-insert configurations. The size callout should be matched to the travel requirement, shoulder bearing surface, tapped hole, and access for the hex key.

Technical Highlights

• Shoulder Diameter: 3/8 in. nominal; 0.373 max / 0.371 min
• Shoulder Length: 5 1/2 in.
• Thread Size and Nominal Thread Length: 5/16-18 x 1/2 in.
• Head Diameter: 0.562 max / 0.543 min
• Head Height: 0.250 max / 0.240 min
• Hex Key Size: 3/16 in.
• Material: Heat-Treated Alloy Steel
• Locking Feature: Nylon insert in threaded end, providing prevailing torque
• Nylon Insert Diameter (P): 1/8 in.
• Nylon Insert Location (N): 13/64 in. (+/-1/2 pitch)

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.