5/16 x 4 3/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert supports serviceable machine designs that need a pivot, spacer, guide, or stop surface in one socket-head part. In stripper-bolt service, the shoulder sets motion or stand-off while the threaded end secures the assembly into the tapped member. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

Maintenance teams may match this stripper bolt to machine guards with guided movement, pivoting brackets, spacers, and alignment stops when a worn guide, spacer, or stop location needs replacement. 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. We install the locking pellet ourselves; odd sizes and special requests are welcome. Check the shoulder fit, threaded-end engagement, head clearance, and pellet location when comparing this part to an existing screw.

Technical Highlights

• Shoulder Diameter: 5/16 in. nominal; 0.3105 max / 0.3085 min
• Shoulder Length: 4 3/4 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.