Vlier SSLF250 Locking Knob Handle Spring Plunger 1/4-20

Product Description

The VLIER SSLF250 is a locking knob handle spring plunger designed for precision positioning and indexing applications in industrial assemblies. Built from stainless steel, it features a 1/4-20 thread size with a 0.4-inch thread length, delivering reliable spring-loaded holding force. The plunger produces an initial end force of 0.5 pounds and a final end force of 2 pounds, making it well suited for applications that require repeatable, controlled engagement. The knurled knob provides secure manual adjustment without additional tools. Machinists, toolmakers, and maintenance technicians install this type of component in fixtures, jigs, and mechanical assemblies.

The SSLF250 is used in light-duty positioning and latching applications across manufacturing, tooling, and equipment maintenance environments. Its stainless steel construction resists corrosion, making it a practical choice for wash-down or humid service conditions. The locking knob style allows the plunger to be manually extended or retracted and held in position, which is useful in fixture setups where the plunger position must stay fixed during operations. This plunger fits standard threaded bores and is installed by hand or with light tooling.

Key Features

• Stainless steel construction for corrosion resistance in demanding environments
• Locking knurled knob allows manual plunger positioning and hold
• Initial end force of 0.5 pounds with final end force of 2 pounds for controlled spring engagement
• 1/4-20 thread size with 0.4-inch thread length for standard bore compatibility
• Plunger projection of 0.125 inches with total plunger length of 0.805 inches
• Compact head diameter of 0.5 inches and head height of 0.28 inches

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard 1/4-20 threaded bores in industrial fixtures, jigs, tooling plates, and mechanical assemblies requiring a locking spring plunger.

Installation Notes

Installation is performed by threading the plunger into a prepared 1/4-20 tapped bore by hand or with an appropriate wrench applied to the head. Ensure the mating bore is clean and free of debris before installation. Do not overtighten, as this can damage the spring mechanism or thread engagement. Follow applicable machinery safety procedures and de-energize or lock out any associated equipment before servicing components in moving assemblies.