Vlier SLF250 Locking Knob Handle Plunger 1/4-20

Product Description

The VLIER SLF250 is a locking knob handle plunger designed for precision positioning and spring-loaded retention applications in industrial and mechanical assemblies. Built from steel with a zinc gold chromate finish, it features a 1/4-20 threaded body with a 0.4-inch thread length and a knurled knob for positive manual actuation. The spring mechanism delivers an initial end force of 0.5 pounds and a final end force of 2 pounds, providing reliable indexed positioning. The plunger diameter ranges from 0.123 to 0.124 inches with a projection of 0.125 inches. This type of component is typically installed by machinists, toolmakers, maintenance technicians, and mechanical assemblers working with jigs, fixtures, or adjustable tooling setups.

The SLF250 is suited for use in light-duty indexing and positioning applications where a spring-loaded plunger with a threaded body is required. Common installation environments include machine tool fixtures, inspection equipment, assembly jigs, and adjustable mechanical stops. The knurled locking knob allows for hand-tightening into tapped holes without the need for wrenches, making it practical for quick-adjust or repeat-position applications in manufacturing and maintenance settings.

Key Features

• 1/4-20 threaded body with 0.4-inch thread length for standard tapped-hole installation
• Knurled locking knob style for tool-free hand tightening and secure positioning
• Spring end force range of 0.5 pounds initial to 2 pounds final for light-duty indexing
• Plunger projection of 0.125 inches with a diameter range of 0.123 to 0.124 inches
• Steel construction with zinc gold chromate finish for corrosion resistance
• Compact head profile: 0.5-inch head diameter and 0.28-inch head height

Compatibility

Designed as an OEM-style replacement or direct-install spring plunger for mechanical assemblies requiring a 1/4-20 threaded locking knob handle plunger with a 0.4-inch thread length.

Installation Notes

Installation is performed by threading the SLF250 into a pre-tapped 1/4-20 hole by hand using the knurled knob. Ensure the receiving hole is clean and free of debris before installation. Disengage or de-energize any associated machinery or moving assemblies before servicing or replacing spring plungers. Do not exceed the rated end force range by modifying the plunger spring or body.