Vlier SPRM12P Locking Pull Ring Plunger M12x1.75

Product Description

The VLIER SPRM12P is a stainless steel locking pull ring plunger designed for indexing, positioning, and holding applications in mechanical assemblies. The plunger features an M12x1.75 threaded body with a 1.4-inch thread length, an 8mm plunger diameter, and a 12.7mm plunger projection. End force ranges from 11 N initial to 22 N final, providing consistent spring-loaded engagement. The locking pull ring mechanism allows the plunger to be retracted and held in the disengaged position, which is essential in applications where hands-free clearance is needed during part loading or alignment. Licensed machinists, toolmakers, and maintenance technicians typically install this component.

The SPRM12P suits industrial machinery, fixtures, jigs, and positioning equipment where repeatable stop or detent points are required. The pull ring lock function makes it well suited for tooling plates, conveyor stops, and assembly fixtures where the operator needs to hold the plunger retracted without continuous manual pressure. With a body length of 51mm and a 35.6mm length under the head, the part integrates into standard threaded bores commonly found in machine plates and fabricated fixtures. The stainless steel construction suits environments with mild corrosion exposure or wash-down requirements.

Key Features

• Locking pull ring retracts and holds plunger in disengaged position for hands-free operation
• M12x1.75 thread for compatibility with standard metric threaded bores
• 8mm plunger diameter with 12.7mm projection provides reliable detent engagement
• End force range of 11 N initial to 22 N final suits light-duty positioning loads
• Stainless steel construction resists corrosion in washdown or humid environments
• Compact head height of 0.6 inches minimizes protrusion above mounting surface

Compatibility

Designed as a direct-fit replacement or new-install locking pull ring plunger for machinery, fixtures, and tooling assemblies using M12x1.75 threaded bores.

Installation Notes

Installation is performed by threading the plunger body into a pre-tapped M12x1.75 through-hole or blind bore in the mounting plate. A wrench flat or hex is typically used to torque the body to the assembler's specified fixture standard - no product-specific torque value is published in the available data. Confirm bore depth accommodates the 51mm body length before installation. Always de-energize or lock out any machinery before servicing or replacing plunger components in live equipment.