Vlier SSPH54N Threaded Spring Plunger 1/4-20 Stainless Steel

Product Description

The VLIER SSPH54N is a threaded spring plunger designed for indexing, positioning, and light detent applications in precision mechanical assemblies. It features a 1/4-20 thread with a 1 inch thread length and a stainless steel body and nose for corrosion resistance. The plunger diameter ranges from 0.117 to 0.118 inches with a 3/16 inch projection. A locking element secures the plunger body in the tapped hole, preventing back-out from vibration or torque. Initial end force is 3 pounds, middle end force is 8 pounds, and final end force is 13 pounds, giving the installer a predictable force curve for the application.

This spring plunger is suited for use in machine tool fixtures, jigs, gauges, and precision positioning assemblies where a small-diameter, low-profile detent point is needed. The locking element design makes it a reliable choice in environments with vibration or repeated cycling. It is typically installed by machinists, tool and die makers, or mechanical assembly technicians working in industrial and commercial manufacturing settings.

Key Features

• 1/4-20 threaded body with 1 inch thread length for standard tapped hole installation
• Locking element prevents back-out under vibration or operational torque
• Stainless steel body and nose material for corrosion resistance
• Plunger projection of 3/16 inch with a diameter of 0.118 inches
• Progressive force curve: 3 lb initial, 8 lb middle, 13 lb final end force
• Standard plunger length type for consistent fitment in common detent applications

Compatibility

Designed as a standard threaded spring plunger replacement or new installation for tapped 1/4-20 holes in precision fixtures, jigs, and mechanical assemblies requiring a locking-style detent element.

Installation Notes

Installation requires a properly tapped 1/4-20 through or blind hole in the mating component. Power down or de-energize any associated equipment before servicing assemblies containing this plunger. Use an appropriate hex driver sized to the 0.079 inch hex for tightening; do not over-torque, as the locking element provides holding force without excessive clamping. Verify plunger projection clearance before final assembly.