1/2 x 4 1/2 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert gives punch-and-die assemblies a defined shoulder length with a locking element in the threaded end. 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. Check the mating hole, die shoe thread, and working clearance before substituting another shoulder diameter or length.
Cold Headers is a Chicago specialty socket fastener distributor focused on exact-size sourcing for industrial replacement needs. We install the locking pellet ourselves; odd sizes and special requests are welcome. For repair work, verify the shoulder length, working diameter, threaded end, and locking-pellet position against the removed fastener.
Technical Highlights
- Shoulder Diameter: 1/2 in. nominal; 0.498 max / 0.496 min
- Shoulder Length: 4 1/2 in.
- Thread Size and Nominal Thread Length: 3/8-16 x 5/8 in.
- Head Diameter: 0.750 max / 0.729 min
- Head Height: 0.312 max / 0.302 min
- Hex Key Size: 1/4 in.
- Material: Heat-Treated Alloy Steel
- Locking Feature: Nylon insert in threaded end, providing prevailing torque
- Nylon Insert Diameter (P): 9/64 in.
- Nylon Insert Location (N): 7/32 in. (+/-1/2 pitch)
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
