Vlier S51 Threaded Spring Plunger 8-32 5/8 Inch Steel

Product Description

The VLIER S51 is a standard threaded spring plunger designed for light-duty indexing, positioning, and detent applications in mechanical assemblies. It uses an 8-32 thread with a 5/8-inch thread length and body length. The plunger nose diameter measures 0.07 inches, with a 3/32-inch projection from the body face. Initial end force is 0.7 pounds and final end force is 2.3 pounds. Both the body and nose are constructed from steel, making this plunger suitable for use in environments where moderate corrosion resistance is acceptable. It installs in a standard threaded hole and requires no locking element for retention.

The S51 is used in light mechanical assemblies where repeatable positioning or detent action is needed. Common applications include jigs, fixtures, tooling plates, and machine components where a small-diameter plunger is required. The compact 8-32 thread size makes it appropriate for installations with limited space. This plunger is typically specified by mechanical technicians, toolmakers, and machine builders working on precision fixtures or assembly equipment where controlled spring force and consistent plunger projection are critical to function.

Key Features

• 8-32 thread size with 5/8-inch thread and body length for straightforward installation in standard tapped holes
• 0.07-inch maximum plunger nose diameter for use in small-bore detent or positioning applications
• 3/32-inch plunger projection provides controlled travel for indexing and detent engagement
• 0.7 lb initial end force and 2.3 lb final end force for light-duty spring-loaded positioning
• Steel body and nose construction for durability in general mechanical service
• No locking element required, simplifying installation and replacement

Compatibility

Designed as a standard OEM-style threaded spring plunger for use in any mechanical assembly or fixture accepting an 8-32 threaded spring plunger with a 5/8-inch thread length and standard projection.

Installation Notes

Installation is performed by mechanical technicians or toolmakers using a standard hex key or screwdriver appropriate for the body style. The mating component must have a properly tapped 8-32 thread to the required depth before installation. Ensure the assembly is de-energized and at rest before installing or removing spring plungers in active fixtures or machinery. Do not exceed the rated end force range, as over-compression can damage the internal spring or deform the plunger nose.