Vlier NS51 Threaded Spring Plunger 8-32 Steel Body

Product Description

The VLIER NS51 is a standard threaded spring plunger designed for indexing, positioning, and light-duty detent applications in mechanical assemblies. It features an 8-32 thread with a 5/8-inch thread length and a phenolic nose on a steel body. The plunger projects 3/32 inches from the body face and delivers 0.70 pounds of initial end force, rising to 2.30 pounds at full compression. The steel body provides durability in industrial environments, while the phenolic nose reduces wear on mating surfaces. This component is typically installed by machinists, toolmakers, and mechanical assembly technicians working with jigs, fixtures, and precision positioning devices.

The NS51 fits applications requiring a small-diameter, low-force spring plunger in a standard threaded body. It is suited for light panel assemblies, drawer slides, instrument enclosures, and fixture plates where consistent detent force and repeatable positioning are required. The 8-32 thread size makes it compatible with standard tapped holes in aluminum, steel, and plastic panels commonly found in industrial and instrumentation assemblies.

Key Features

• 8-32 thread with 5/8-inch thread length for easy installation in standard tapped holes
• 0.70 pounds initial end force and 2.30 pounds final end force for controlled detent action
• Phenolic nose minimizes wear on mating surfaces and reduces marring
• Steel body provides resistance to deformation under repetitive loading
• Plunger diameter range of 0.068 to 0.070 inches for consistent fit and travel
• No locking element, allowing straightforward installation and removal with a standard hex key or spanner

Compatibility

Designed as a standard OEM-style replacement or new-installation spring plunger for assemblies using 8-32 tapped holes requiring a low-force, small-diameter detent plunger.

Installation Notes

Installation is performed by threading the NS51 into a clean, properly tapped 8-32 hole using a hex key or spanner wrench sized for the body drive feature. Ensure mating threads are free of debris and the hole depth accommodates the full 5/8-inch thread length before seating. Do not overtighten, as excessive torque can damage the phenolic nose or distort the spring mechanism. Depressurize or de-energize any assembly before servicing spring plungers in active fixtures or panels.