Vlier NS61 Threaded Spring Plunger 1/2-13 Steel

Product Description

The VLIER NS61 is a standard-length threaded spring plunger designed to provide controlled, repeatable positioning force in tooling, fixtures, and mechanical assemblies. With a 1/2-13 thread and a 1-1/4 inch thread length, it installs directly into tapped holes using standard tooling. The steel body delivers durability under cyclic loading, while the phenolic nose resists wear against mating surfaces. Initial end force is 2.7 pounds, rising to 9.3 pounds at full compression, giving engineers and machinists a predictable force range for indexing and locating applications. The 0.248 inch plunger diameter and 1/4 inch projection are suited for tight-tolerance assemblies.

The NS61 is used in production fixtures, jigs, machine tool components, and assembly equipment where a positive but releasable detent or positioning stop is required. Typical installations include CNC fixture plates, die sets, and workholding devices. Machinists and tool-and-die professionals install this plunger in applications demanding consistent spring force across repeated cycles. The non-locking body design allows straightforward installation and removal without staking or adhesive retention.

Key Features

• 1/2-13 thread size with 1-1/4 inch thread length for standard tapped-hole installation
• 2.7 pound initial end force and 9.3 pound final end force for predictable detent action
• Steel body construction for durability in high-cycle tooling applications
• Phenolic nose material reduces wear on mating contact surfaces
• 0.248 inch plunger diameter with 1/4 inch projection for compact, tight-tolerance assemblies
• Non-locking design allows easy installation and adjustment

Compatibility

Designed as an OEM-style replacement or new-installation threaded spring plunger for fixtures, jigs, and mechanical assemblies requiring a 1/2-13 tapped hole.

Installation Notes

Installation is performed by machinists or mechanical technicians using a hex key or spanner wrench appropriate for the plunger body. Ensure the mating tapped hole is clean and free of debris before threading in the plunger. De-energize or lock out any powered equipment before servicing fixtures or assemblies containing spring plungers. Do not exceed the rated final end force by over-compressing the plunger beyond its specified projection travel.