Vlier SSL250 Knob Handle Spring Plunger 1/4-20

Product Description

The VLIER SSL250 is a knob handle spring plunger designed for indexing, positioning, and light-duty holding applications in mechanical assemblies. It features a 1/4-20 thread size with a 0.5 inch thread length and a knurled knob head for manual actuation without tooling. The non-locking plunger delivers an initial end force of 1 pound and a final end force of 4 pounds, making it suitable for light detent and registration tasks. Constructed from stainless steel, the SSL250 offers corrosion resistance in washdown and outdoor environments. Mechanical assemblers, maintenance technicians, and tooling specialists typically install this component.

The SSL250 is suited for use in jigs, fixtures, machine tool assemblies, and industrial positioning equipment where a manually adjustable spring plunger is required. The knurled knob allows hand-tightening and actuation in tight spaces without a wrench. Its compact body length of 0.79 inches and 0.5 inch length under head make it appropriate for shallow mounting bosses and thin panels in light mechanical and industrial applications.

Key Features

• Knurled knob handle allows tool-free manual actuation and adjustment
• Non-locking plunger design with 1 pound initial and 4 pound final end force
• 1/4-20 thread size with 0.5 inch thread length for standard tapped-hole installation
• Maximum plunger diameter of 0.123 inches with a tolerance of +0.001 / -0.000 inches
• Stainless steel construction for corrosion resistance in demanding environments
• Compact body length of 0.79 inches suitable for space-constrained assemblies

Compatibility

Designed for installation in standard 1/4-20 tapped holes in jigs, fixtures, machine tool components, and industrial positioning assemblies requiring a non-locking knob handle spring plunger.

Installation Notes

Installation is performed by threading the SSL250 into a pre-tapped 1/4-20 hole by hand or with a wrench applied to the body, not the knob. Ensure the mating hole depth accommodates the 0.5 inch thread length and the 0.125 inch plunger projection. De-energize or lock out any moving machinery before servicing spring plunger components in automated or power-driven assemblies. Do not exceed the rated end force range when specifying load requirements for the application.