Vlier HH6251 Threaded Spring Plunger 5/8-11 Steel

Product Description

The VLIER HH6251 is a heavy-duty threaded spring plunger designed for use in industrial tooling, fixturing, and positioning applications where controlled, repeatable end force is required. Built with a steel body and steel nose, this long-style plunger features a 5/8-11 thread and a 1-1/4 inch thread length. It delivers 4 pounds of initial end force and 20 pounds of final end force, making it well suited for applications that demand firm, consistent holding or locating performance. A locking element is included to prevent the plunger from backing out under vibration or repeated cycling.

This spring plunger is used in machine shop environments, jigs, fixtures, assembly equipment, and precision positioning setups. It is typically installed in machined or tapped bores where repeatable detent or locating action is needed. The long plunger length of 4.37 inches and 1-inch projection make this model appropriate for applications requiring extended reach beyond the mounting body. Mechanical assemblers, tool and die makers, and industrial maintenance technicians are the primary installers.

Key Features

• 5/8-11 thread size with 1-1/4 inch thread length for secure installation in tapped bores
• 1-inch plunger projection for extended reach in fixturing applications
• 4 pound initial end force and 20 pound final end force for firm, controlled positioning
• Locking element prevents back-out under vibration and repeated use
• Steel body and steel nose for durability in industrial environments
• Long plunger length style at 4.37 inches total plunger length

Compatibility

Designed as an OEM-style replacement or direct-install threaded spring plunger for industrial tooling, jigs, fixtures, and positioning equipment requiring a 5/8-11 threaded body with long projection configuration.

Installation Notes

Installation requires a properly tapped 5/8-11 bore in the mounting body. Power down or de-energize any associated equipment before installing or servicing the plunger. Use appropriate hand tools to thread the plunger into the bore; do not overtighten, as this can damage the locking element or distort the body. Confirm the plunger moves freely and returns fully before returning the assembly to service.