Vlier HH7501 Threaded Spring Plunger 3/4-10 Steel

Product Description

The VLIER HH7501 is a long-body threaded spring plunger designed to provide controlled, spring-loaded positioning and holding force in precision mechanical assemblies. It features a 3/4-10 thread with a 1.5-inch thread length, a steel body measuring 3.75 inches in length and 0.623 inches in diameter, and a steel nose. The plunger delivers 4 pounds of initial end force and 35 pounds of final end force, making it well suited for applications that require a firm, repeatable detent. A locking element is included to secure the plunger in its threaded bore once installed. Licensed machinists, tool-and-die technicians, and mechanical assembly technicians are the typical installers.

The HH7501 is used in fixtures, jigs, tooling plates, machine components, and industrial equipment where a spring-loaded plunger must resist backing out under vibration or load. The long plunger length of 5.25 inches total accommodates deeper assemblies that standard-length plungers cannot reach. The 35-pound final end force suits moderate-to-firm detent requirements in steel or aluminum housings. This plunger is appropriate for both light production tooling and maintenance-repair applications.

Key Features

• 3/4-10 thread size with 1.5 inches of thread engagement length
• Long plunger body at 3.75 inches body length and 5.25 inches total plunger length
• 4 pounds initial end force and 35 pounds final end force for firm, repeatable detent
• Steel body and steel nose for durability in industrial environments
• Locking element prevents the plunger from backing out under vibration or repeated cycling
• Maximum plunger diameter of 0.38 inches with a 0.38-inch hex size for installation tooling

Compatibility

Designed as an OEM-style and aftermarket replacement spring plunger for threaded bores accepting a 3/4-10 thread in industrial fixtures, jigs, and mechanical assemblies requiring a long-body configuration.

Installation Notes

Installation is performed by mechanical assembly technicians using a hex wrench sized to the 0.38-inch hex. The threaded bore should be clean and free of debris before installation. Torque the plunger to the housing manufacturer's specified value and engage the locking element fully to prevent loosening under vibration. Always de-energize or lock out any machine or fixture before servicing spring plunger components.