Vlier FRN500P Spring Plunger 1/2-13 Steel L Handle

Product Description

The VLIER FRN500P is a steel L handle spring plunger designed for precision positioning, indexing, and locating applications in industrial and mechanical assemblies. The plunger features a 1/2-13 thread size with a thread length of 1.1 inches and a body length of 2.11 inches. Spring force ranges from 1 pound initial end force to 5 pounds final end force, making it well suited for light-duty detent and positioning work. The plunger diameter is 0.31 inches with a projection of 0.75 inches. This part is installed by maintenance technicians, machine builders, and tooling specialists working with jigs, fixtures, and production machinery.

The FRN500P is used in applications where repeatable positioning or detent action is needed without a locking element to hold the plunger in the retracted position. It fits into threaded bores in machine plates, fixture bodies, and tooling blocks. The L handle configuration allows the plunger to be manually retracted without additional tooling, which is common in fixture and jig applications where an operator needs quick access. The non-locking design allows the spring to return the plunger automatically once released, maintaining consistent end force throughout service.

Key Features

• 1/2-13 thread size with 1.1 inch thread length for standard threaded bore installation
• Non-locking plunger type with automatic spring return
• Initial end force of 1 pound, final end force of 5 pounds for light-duty detent applications
• Steel L handle allows manual retraction without tools; handle length 1 inch, handle diameter 0.19 inches
• Plunger projection of 0.75 inches; plunger diameter of 0.31 inches
• Locking element included for securing the plunger assembly in the bore

Compatibility

Designed as an OEM-style replacement or direct install spring plunger for threaded bores sized to accept 1/2-13 thread in industrial fixtures, jigs, and tooling assemblies.

Installation Notes

Installation is performed by qualified maintenance technicians or machine builders familiar with threaded fastener and fixture work. Thread the plunger into a properly tapped 1/2-13 bore using the hex flats sized at 0.5 inches; do not overtighten as this can distort the plunger body or alter spring force. De-energize or lock out any associated machinery before installation or removal per applicable OSHA lockout/tagout procedures. Inspect the bore threads for damage or contamination before installation to ensure correct seating and consistent end force.