Vlier FR250 Locking L Handle Spring Plunger 1/4-20 Steel

Product Description

The VLIER FR250 is a locking L handle spring plunger designed for indexing, positioning, and light-duty retention applications in mechanical assemblies. It features a 1/4-20 thread size with a 0.8 inch thread length and a 0.16 inch plunger diameter. The spring delivers 0.5 pounds initial end force rising to 2.5 pounds final end force, providing repeatable, controlled engagement. The body is 1.25 inches long with a 0.8 inch length under head and a 0.38 inch plunger projection. The steel construction makes it well-suited for production tooling, fixtures, and machine components where reliable spring-loaded retention is required.

The FR250 is used in industrial and manufacturing environments where a threaded spring plunger must be installed into a tapped hole and locked in position. The L handle allows for tool-free adjustment and removal. Typical applications include jigs, fixtures, assembly tooling, and mechanical positioning systems where controlled spring force and locking capability are needed. The plunger can be installed by hand or with a hex wrench using the 0.25 inch hex size.

Key Features

• 1/4-20 thread size with 0.8 inch thread length for standard tapped-hole installation
• Locking L handle design allows tool-free positioning and removal without a wrench
• 0.5 to 2.5 pounds end force range provides light, consistent spring-loaded engagement
• 0.38 inch plunger projection suitable for shallow-detent indexing applications
• Steel handle construction for durability in production and tooling environments
• 0.25 inch hex size accommodates standard hex wrench for torquing into place

Compatibility

Designed as a standard threaded spring plunger for installation in any component or assembly with a matching 1/4-20 tapped hole requiring locking L handle access and spring-loaded plunger retention.

Installation Notes

Installation is performed by threading the FR250 directly into a 1/4-20 tapped hole by hand or with a 0.25 inch hex wrench. Ensure the mating assembly is de-energized and stationary before installing or removing the plunger. Do not overtighten, as excessive torque may damage the thread or affect spring performance. Follow applicable machine safety and lockout/tagout procedures before servicing any assembly that uses this component.