5/16 x 2 1/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert helps replace or specify a shoulder screw where die travel, fixture spacing, or guided motion depends on exact size. The ground shoulder works as the bearing, guide, pivot, spacer, or travel-control surface, while the smaller 1/4-20 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.

In progressive dies, stripper plate return, guide pins, and die-shoe repair, the shoulder length helps establish travel or stand-off while the smaller 1/4-20 thread retains the screw. A 5/16 in. shoulder measures 0.3085-0.3105 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: 5/16 in. nominal; 0.3105 max / 0.3085 min
• Shoulder Length: 2 1/4 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.