Vlier FR375 Locking L Handle Plunger 3/8-16 Steel

Product Description

The VLIER FR375 is a locking L-handle spring plunger designed for precision positioning and indexing applications in industrial and mechanical assemblies. Built with a steel handle and a 0.25-inch plunger diameter, this plunger installs into a threaded bore using a 3/8-16 thread with a 1.18-inch thread length. The locking L-handle design allows the plunger to be retracted and held in the withdrawn position, freeing hands during workpiece loading or fixture setup. Initial end force is 0.75 pounds, building to a final end force of 3.75 pounds. Machinists, toolmakers, and assembly technicians install this type of component in jigs, fixtures, and machine tool slides.

The FR375 suits applications where repeatable positioning is required and a retractable plunger reduces interference during part loading. Typical install scenarios include fixture plates, index tables, tooling plates, and slide-stop mechanisms in light industrial equipment. The locking feature makes it well suited for setups where the plunger must stay retracted until deliberately released. The 0.56-inch plunger projection provides adequate engagement depth for most standard fixture applications.

Key Features

• Locking L-handle allows plunger to be held in the retracted position during loading operations
• 3/8-16 thread for installation into standard tapped bores
• 0.25-inch plunger diameter with 0.56-inch projection for positive part engagement
• Progressive spring force from 0.75 pounds initial to 3.75 pounds final end force
• Steel handle construction for durability in production environments
• Compact 2-inch body length fits tight fixture assemblies

Compatibility

Designed as a direct-install spring plunger for threaded bores with a 3/8-16 thread, suitable for use in standard jig, fixture, and tooling plate applications requiring a locking retractable plunger.

Installation Notes

Installation is performed by threading the FR375 into a properly tapped 3/8-16 bore using a hex wrench on the 0.38-inch hex. Ensure the bore is clean and free of chips before installation. Do not exceed the rated end force by over-compressing the plunger spring. De-energize or lock out any moving machine components before servicing or replacing plungers in active fixtures.