1/2 x 4 1/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert combines a socket head, a precision shoulder, and a nylon insert for controlled travel in inch-size die hardware. 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.

This format fits automation slides, transfer equipment, guided brackets, and plant maintenance repairs, especially where service records call out both shoulder diameter and shoulder length. A 1/2 in. shoulder measures 0.496-0.498 in.; it is sized to slide and pivot, not press into the mating component. For metric die sets, compare Metric Socket Head Stripper Bolts instead of converting inch shoulder sizes.

For maintenance and toolroom sourcing, Cold Headers helps match exact shoulder dimensions rather than forcing a near-size substitute. Before ordering, compare the drawing to the shoulder size, thread size, head envelope, hex key, and nylon pellet placement.

Technical Highlights

• Shoulder Diameter: 1/2 in. nominal; 0.498 max / 0.496 min
• Shoulder Length: 4 1/4 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.