Vlier PRM12P Locking Pull Ring Plunger M12x1.75 Steel

Product Description

The VLIER PRM12P is a locking pull ring spring plunger designed for precision indexing, positioning, and holding applications in mechanical assemblies. It features an M12x1.75 thread and a steel body with a 1.4-inch thread length. The 8mm plunger diameter delivers an initial end force of 11 N, increasing to a final end force of 22 N, making it suitable for moderate-load retention tasks. The locking pull ring element locks the plunger in the retracted position, allowing hands-free access during part loading or tooling changes. Mechanical assemblers and maintenance technicians install this plunger in jigs, fixtures, machine frames, and similar industrial equipment.

This plunger is suited for use in precision fixtures, workholding equipment, jigs, and tooling assemblies where a repeatable spring-loaded detent or locking position is required. The pull ring lock feature makes it practical in applications where the plunger must stay retracted without constant manual pressure. It is installed by threading it into a tapped M12x1.75 hole in a metal workpiece, plate, or housing.

Key Features

• Locking pull ring holds plunger in fully retracted position for hands-free operation
• M12x1.75 thread with 1.4-inch thread length for secure installation in tapped holes
• 8mm plunger diameter with 12.7mm plunger projection at full extension
• End force range from 11 N initial to 22 N final for consistent detent resistance
• Steel construction for durability in industrial and mechanical environments
• Compact 25mm ring diameter and 0.6-inch head height for tight-clearance installations

Compatibility

Designed as an OEM-style replacement or direct installation component for equipment requiring an M12x1.75 locking pull ring plunger in jigs, fixtures, or mechanical assemblies.

Installation Notes

A licensed machinist or mechanical technician should verify the receiving bore and thread condition before installation. Ensure the mating assembly is de-energized and stationary before installing or removing the plunger. Use appropriate thread engagement depth per standard fastener practice to avoid stripping the tapped hole. Do not exceed the rated end force by forcing the plunger beyond its designed projection range.