Vlier PR375 Locking Pull Ring Plunger 3/8-16 Steel

Product Description

The VLIER PR375 is a steel locking pull ring plunger designed for precision indexing and positioning applications in mechanical assemblies. The plunger features a 3/8-16 thread with a 1.2-inch thread length and a 0.233-inch plunger diameter, delivering an initial end force of 2 pounds and a final end force of 4 pounds. The pull ring lock mechanism holds the plunger in the retracted position until manually released, preventing unintended engagement during machine operation or assembly procedures. This type of component is typically installed by machinists, tool and die technicians, or mechanical assembly professionals working with jigs, fixtures, and positioning equipment.

The VLIER PR375 is suited for use in industrial fixtures, tooling plates, machine guarding assemblies, and precision positioning systems where controlled plunger engagement is required. The locking pull ring design is particularly well-suited for applications that demand repeatable manual actuation without the risk of accidental plunger extension. The 3/8-16 thread makes it compatible with standard tapped holes found in steel and aluminum tooling components.

Key Features

• Locking pull ring holds plunger retracted until manually released
• 3/8-16 thread size for compatibility with standard tapped tooling holes
• Initial end force of 2 pounds, final end force of 4 pounds for controlled engagement
• Steel construction for durability in industrial environments
• 0.233-inch plunger diameter with 0.375-inch plunger projection
• Compact 1.68-inch body length suitable for space-constrained assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical fixtures and positioning assemblies using 3/8-16 tapped mounting holes.

Installation Notes

Installation is performed by threading the PR375 into a 3/8-16 tapped hole to the specified thread engagement depth. Ensure the mating hole is clean and free of debris before installation. Use appropriate hand tools and avoid overtightening, which can damage the plunger housing or thread engagement. Always de-energize or lock out any machinery before servicing plunger components in automated or powered assemblies.