Vlier M61N Threaded Spring Plunger 1/2-13 Steel Locking

Product Description

The VLIER M61N is a stubby threaded spring plunger designed for high end force applications in restricted-space installations. Built with a steel body and steel nose, it uses a 1/2-13 thread and delivers an initial end force of 1.75 pounds and a final end force of 5.5 pounds. The plunger projects 0.151 inches and has a maximum plunger diameter of 0.248 inches, making it well suited for tight assemblies where a standard-length plunger will not fit. A locking element is included to secure the plunger body after installation, preventing rotation and positional drift in service.

This spring plunger is used in mechanical assemblies across manufacturing, tooling, fixturing, and industrial equipment applications. Its stubby profile makes it the preferred choice when thread depth or cavity space is limited. The locking element adds value in vibration-prone environments where maintaining set position is critical. Machinists, toolmakers, and maintenance technicians install this type of component in jigs, fixtures, detent mechanisms, and positioning assemblies.

Key Features

• Stubby plunger length type for use in restricted-space applications
• 1/2-13 thread with 0.75 inches thread length for secure engagement
• Initial end force of 1.75 pounds and final end force of 5.5 pounds for high-force detent performance
• Steel body and steel nose for durability in industrial environments
• Locking element prevents body rotation after installation torque is applied
• Maximum plunger diameter of 0.248 inches with 0.151 inches projection

Compatibility

Designed as an OEM-style replacement or direct-install threaded spring plunger for mechanical assemblies requiring a 1/2-13 stubby spring plunger with a locking element in high end force and restricted-space configurations.

Installation Notes

Installation is performed by threading the plunger body into a pre-tapped 1/2-13 hole using an appropriate wrench or hex tool. Engage the locking element after the plunger is positioned to prevent loosening under vibration. Ensure the mating bore or detent surface aligns with the plunger projection before finalizing position. De-energize or lock out any powered equipment before servicing assemblies containing spring plungers.