Vlier SSPH55 Threaded Spring Plunger 1/4-20 Stainless Steel

Product Description

The VLIER SSPH55 is a threaded spring plunger designed to provide controlled, repeatable positioning and indexing force in mechanical assemblies. The body and nose are both machined from stainless steel, making this plunger suitable for corrosive or washdown environments. It features a 1/4-20 thread with a 1 inch thread length and a standard plunger projection of 3/16 inch. Initial end force is 1 pound, middle end force is 2.5 pounds, and final end force is 4 pounds. Installed by machinists, toolmakers, and maintenance technicians, this plunger fits tapped holes in fixtures, jigs, and machine components.

The SSPH55 is used in industrial and precision mechanical applications where a spring-loaded ball or nose must engage a detent, register a position, or provide light holding force. Typical install scenarios include tooling fixtures, hinged covers, drawer stops, and assembly jigs in both light manufacturing and maintenance environments. The stainless steel construction makes it appropriate for applications where mild chemical exposure, moisture, or frequent cleaning cycles are present.

Key Features

• Stainless steel body and nose for corrosion resistance
• 1/4-20 thread for installation into standard tapped holes
• 1 inch thread length and 1 inch body length for secure engagement depth
• Standard plunger projection of 3/16 inch
• Progressive spring force: 1 pound initial, 2.5 pounds middle, 4 pounds final end force
• No locking element, allowing straightforward installation and removal by hand tools

Compatibility

Designed as an OEM-style replacement or direct-fit component for machinery, fixtures, and tooling assemblies that accept a 1/4-20 threaded spring plunger with a 1 inch thread length and standard projection.

Installation Notes

Installation is performed by threading the SSPH55 into a properly tapped 1/4-20 hole using a hex key sized for the 0.079 inch hex drive. Ensure the mating hole is clean and free of debris before installation. De-energize or lock out any machinery before servicing components in the assembly. Do not overtighten, as stainless steel threads are susceptible to galling against similar materials.