Gibraltar STPR38-PT-G Locking Pull Ring Plunger 3/8-16

Product Description

The GIBRALTAR STPR38-PT-G is a steel locking pull ring plunger designed for use in mechanical assemblies where a positive, spring-loaded locking position is required. The plunger threads into a tapped hole using a 3/8-16 thread and extends 0.375 inches when engaged. An integrated pull ring allows the plunger to be retracted manually without tools, releasing the locking position for adjustment or repositioning. Initial end force is 2 pounds, with a final end force of 4 pounds, providing reliable holding force in light-duty indexing and positioning applications. The steel construction gives it durability in industrial and mechanical service environments.

This pull ring plunger is suited for use in machinery, fixtures, jigs, enclosures, and equipment panels where a repeatable, tool-free locking point is needed. It is commonly installed by millwrights, maintenance technicians, and mechanical assemblers working on positioning mechanisms, sliding assemblies, and access doors. The 3/8-16 thread size allows installation directly into standard tapped holes in steel, aluminum, or other structural materials without additional hardware.

Key Features

• Locking pull ring design allows tool-free retraction and release of the plunger
• 3/8-16 thread with 1.2 inch thread length for secure engagement in tapped holes
• Spring end force of 2 pounds initial to 4 pounds final for consistent indexing resistance
• Plunger diameter of 0.233 inches and projection of 0.375 inches for precise fit in receiver holes
• All-steel construction for durability in industrial mechanical applications
• Locking element included to secure the plunger position when required

Compatibility

Designed as a standard 3/8-16 threaded locking pull ring plunger suitable for installation in any tapped hole application requiring a spring-loaded positioning or indexing function.

Installation Notes

Installation requires a tapped 3/8-16 hole in the mating component. Thread the plunger in by hand and torque to the assembly requirement using a wrench on the head. Ensure the receiver hole for the plunger tip is correctly sized and positioned before final tightening. Disengage the plunger by pulling the ring before repositioning the assembly to avoid damage to the plunger tip or receiver.