5/16 x 3/8 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert fits inch stripper-bolt applications where shoulder length, shoulder diameter, and thread retention all matter. 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.

This format fits retrofit die repair, replacement shoulder locations, stop blocks, and travel controls, especially where service records call out both shoulder diameter and shoulder length. Thread length is nominal, so review the drawing or service record when replacing an existing die component.

Cold Headers assists with specialty socket products, replacement fasteners, and nylon-insert shoulder screw requirements. Confirm the working shoulder length, tapped-hole depth, hex key clearance, and nylon insert position during replacement sourcing.

Technical Highlights

• Shoulder Diameter: 5/16 in. nominal; 0.3105 max / 0.3085 min
• Shoulder Length: 3/8 in.
• Thread Size and Nominal Thread Length: 1/4-20 x 7/16 in.
• Head Diameter: 0.438 max / 0.419 min
• Head Height: 0.219 max / 0.209 min
• Hex Key Size: 5/32 in.
• Material: Heat-Treated Alloy Steel
• Locking Feature: Nylon insert in threaded end, providing prevailing torque
• Nylon Insert Diameter (P): 7/64 in.
• Nylon Insert Location (N): 3/16 in. (+/-1/2 pitch)

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