1/2 x 3 3/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert uses a ground shoulder to guide, space, or support motion while the nylon-insert threaded end supplies prevailing torque. The ground shoulder works as the bearing, guide, pivot, spacer, or travel-control surface, while the smaller 3/8-16 threaded end anchors into the die shoe or fixture. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.
For rotary fixtures, indexing tooling, sliding details, and production alignment stations, the shoulder can act as the controlled surface while the nylon insert helps resist backing out under cyclic motion. Alloy steel suits strength-focused tooling, but the part should be kept oiled or indoors when exposure is a concern. For joints torqued once and left alone, compare plain Alloy Steel Socket Head Stripper Bolts.
Cold Headers has supplied specialty socket fasteners since 1962, with practical support for hard-to-find stripper bolt sizes. Need the pellet in a non-catalog size or a different location? In-house pelletizing means we can do that. Check the shoulder fit, threaded-end engagement, head clearance, and pellet location when comparing this part to an existing screw.
Technical Highlights
- Shoulder Diameter: 1/2 in. nominal; 0.498 max / 0.496 min
- Shoulder Length: 3 3/4 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.
