Vlier NM61N Threaded Spring Plunger 1/2-13 Steel Locking

Product Description

The VLIER NM61N is a stubby threaded spring plunger designed for precision positioning, detenting, and light-duty holding applications in mechanical assemblies. The plunger features a 1/2-13 thread with a 0.75-inch thread length and a maximum plunger diameter of 0.248 inches. Projection measures 0.151 inches. Initial end force is 1.75 pounds and final end force is 5.5 pounds, making this unit suitable for applications requiring controlled, repeatable engagement. The steel body provides durability in industrial environments, while the Delrin nose reduces wear on mating surfaces. A locking element is included to secure the plunger in place after installation.

The NM61N is used in tooling fixtures, jigs, machine components, and precision assemblies where a compact spring plunger is required. The stubby body length of 0.75 inches makes it well suited for installations where space is limited along the thread axis. This plunger is typically installed by machinists, toolmakers, or maintenance technicians working on positioning and indexing mechanisms in industrial and manufacturing settings.

Key Features

• 1/2-13 thread size with 0.75-inch thread length for standard threaded bores
• Stubby plunger style - 0.75-inch body length for space-constrained installations
• 0.248-inch maximum plunger diameter with 0.151-inch projection
• 1.75-pound initial end force and 5.5-pound final end force for controlled detent engagement
• Steel body construction for strength and wear resistance
• Delrin nose material reduces friction and protects mating surfaces
• Locking element included to prevent plunger from backing out under vibration

Compatibility

Designed as a direct-fit threaded spring plunger for standard 1/2-13 tapped holes in tooling fixtures, jigs, and mechanical assemblies requiring stubby-style plunger engagement.

Installation Notes

Installation is performed by threading the NM61N into a properly tapped 1/2-13 hole using a spanner wrench or appropriate installation tool. Ensure the mating bore is clean and free of debris before installation. Engage the locking element to the specified position to prevent the plunger from loosening under load or vibration. Do not overtighten, as excessive force may damage the Delrin nose or distort the plunger body.