Vlier SPR375P Locking Pull Ring Plunger 3/8-16 Stainless

Product Description

The VLIER SPR375P is a stainless steel locking pull ring plunger designed for precision indexing, positioning, and locking applications in mechanical assemblies. The pull ring locking mechanism holds the plunger in the retracted position until deliberately released, eliminating unintended engagement during operation. Thread size is 3/8-16 with a thread length of 1.2 inches and a plunger diameter of 0.233 inches. End force ranges from 2 pounds initial to 4 pounds final, providing consistent, repeatable holding force. Stainless steel construction offers corrosion resistance in demanding environments. This component is typically installed by maintenance technicians, machine builders, and automation specialists working on jigs, fixtures, and positioning equipment.

The SPR375P suits applications where a plunger must be locked in the retracted position to allow free movement of a mating component before re-engagement. Common uses include tooling fixtures, indexing mechanisms, sliding assemblies, and panels requiring secure, releasable positioning. The locking pull ring allows the technician to retract and lock the plunger with one hand, freeing the other for alignment tasks. Stainless steel construction makes this plunger suitable for wash-down environments, food processing equipment, and other corrosion-sensitive installations.

Key Features

• Locking pull ring retracts and holds plunger out of engagement until manually released
• Thread size 3/8-16 with 1.2 inch thread length for standard threaded-hole installation
• End force: 2 pounds initial to 4 pounds final for consistent positioning resistance
• Plunger diameter of 0.233 inches and projection of 0.375 inches
• Full stainless steel construction for corrosion resistance in harsh or wet environments
• Compact body length of 1.68 inches suits space-constrained assemblies

Compatibility

Designed as a direct-thread replacement or new-installation pull ring plunger for threaded bores sized 3/8-16, as used in standard mechanical fixtures, tooling plates, indexing assemblies, and positioning jigs requiring a locking plunger element.

Installation Notes

Installation requires a 3/8-16 threaded bore of sufficient depth to accept the 1.2 inch thread length. Ensure the mating bore is clean and free of debris before threading the plunger in by hand, then torque to the assembly specification for the host material. Power down or de-energize any equipment before servicing plunger assemblies in automated machinery. Avoid over-torquing stainless steel threaded components into dissimilar metal bores to prevent galling.