Vlier SPRT500P Knob Handle Spring Plunger 1/2-13

Product Description

The VLIER SPRT500P is a non-locking knob handle spring plunger designed for indexing, positioning, and light-duty holding applications in industrial and mechanical assemblies. The plunger body is stainless steel with a Delrin knob handle, threaded at 1/2-13 for installation into tapped holes. It delivers an initial end force of 0.5 pounds and a final end force of 1.75 pounds, making it suitable for applications requiring controlled, repeatable engagement. The maximum plunger diameter is 0.31 inches with a plunger projection of 0.25 inches. A locking element is included to secure the plunger position once set. Machinists, maintenance technicians, and assembly line personnel typically install this component.

The SPRT500P is used in fixtures, jigs, tooling plates, and machine assemblies where a manually adjustable spring plunger with a knob handle is required. The Delrin knob allows hand-tightening and adjustment without tools, which suits applications that require frequent repositioning or field adjustment. The 1/2-13 thread size is a common imperial thread found across a wide range of industrial and OEM equipment platforms. Body length is 1.25 inches with a length under head and shoulder of 1 inch.

Key Features

• Non-locking plunger type for free, repeatable engagement and retraction
• Delrin knob handle allows tool-free hand adjustment
• Locking element included to fix plunger depth after setting
• Stainless steel body construction for corrosion resistance
• 0.5 pound initial end force to 1.75 pound final end force for light-duty positioning
• Standard 1/2-13 thread for broad compatibility with tapped industrial hardware

Compatibility

Designed as a standard 1/2-13 threaded spring plunger for use in industrial fixtures, jigs, and mechanical assemblies requiring a non-locking knob-style plunger.

Installation Notes

Installation requires a properly tapped 1/2-13 threaded hole in the mating component. Power down or de-energize any equipment before servicing assemblies that contain this plunger. Hand-tighten the Delrin knob to the desired plunger depth, then engage the locking element to hold the set position. Avoid over-torquing the knob, as the Delrin material can be damaged by excessive force.