Vlier SSPH54 Threaded Spring Plunger 1/4-20 Stainless Steel

Product Description

The VLIER SSPH54 is a threaded spring plunger designed for precision positioning, indexing, and light-duty detent applications in mechanical assemblies. It features a 1/4-20 thread with a 1 inch thread length and a stainless steel body and nose, making it suitable for environments where corrosion resistance matters. The plunger nose diameter ranges from 0.117 to 0.118 inches with a 3/16 inch projection. Initial end force is 3 pounds, progressing through a middle end force of 8 pounds to a final end force of 13 pounds, giving a predictable force ramp for controlled engagement. Machinists, tool and die technicians, and mechanical assembly professionals install this type of component in fixtures, jigs, and precision equipment.

The SSPH54 is suited for use in tooling fixtures, machine tool components, production jigs, and general mechanical assemblies where repeatable spring-loaded positioning is required. The all-stainless steel construction makes it appropriate for washdown-prone or corrosive environments. It installs into a tapped 1/4-20 through-hole or blind hole with standard threading. No locking element is incorporated, so torque and positioning are managed by thread engagement alone. The standard plunger length type means the 1 inch body length fits typical fixture plate thicknesses without custom machining.

Key Features

• 1/4-20 external thread with 1 inch thread length for standard tapped-hole installation
• Stainless steel body and nose construction for corrosion resistance
• Progressive end force: 3 pounds initial, 8 pounds middle, 13 pounds final
• Plunger nose diameter of 0.117 to 0.118 inches with 3/16 inch projection
• No locking element - adjustable by thread engagement depth
• Hex drive at 0.079 inches for installation and torque adjustment

Compatibility

Designed as an OEM-style or replacement threaded spring plunger for use in standard 1/4-20 tapped holes in mechanical fixtures, jigs, and precision tooling assemblies.

Installation Notes

A licensed machinist or mechanical technician typically installs threaded spring plungers using the appropriate hex key to drive the plunger into a pre-tapped 1/4-20 hole. De-energize or lock out any machine or assembly before servicing spring plungers in active tooling. Do not overtighten, as excessive torque can deform the plunger body or alter the force characteristics. Verify thread engagement depth matches the application load requirements before finalizing installation.