Vlier S59N Threaded Spring Plunger 3/8-16 Steel Locking

Product Description

The VLIER S59N is a threaded spring plunger designed for positive positioning and indexing applications in mechanical assemblies. It features a 3/8-16 thread with a 1-1/8 inch thread length and a steel body with an integrated locking element that secures the plunger in place once installed. The plunger nose diameter ranges from 0.186 to 0.187 inches with a 3/16 inch projection. Initial end force is 2.8 pounds and final end force is 7.2 pounds, providing consistent, repeatable holding force in tooling, fixtures, and precision assemblies. Licensed machinists, tool and die makers, and mechanical assembly technicians typically specify and install this component.

The S59N is suited for use in machine tool fixtures, jigs, workholding equipment, and industrial positioning assemblies where a reliable spring-loaded detent is required. The standard-length plunger configuration fits a wide range of threaded bore applications calling for a 3/8-16 thread. The locking element prevents the plunger body from backing out under vibration or load cycling, making it appropriate for demanding production environments where fastener retention is critical.

Key Features

• 3/8-16 thread size with 1-1/8 inch thread and body length for standard fitment
• Steel body and steel nose material for durability in industrial environments
• Integrated locking element prevents back-out under vibration
• 2.8 pound initial end force and 7.2 pound final end force for consistent detent action
• Plunger projection of 3/16 inch with nose diameter of 0.186 to 0.187 inches
• Standard plunger length type for broad compatibility with common bore configurations

Compatibility

Designed as an OEM-style threaded spring plunger for mechanical fixtures, jigs, and positioning assemblies that accept a 3/8-16 threaded bore with a standard 1-1/8 inch body length.

Installation Notes

Installation is performed by machinists or mechanical assembly technicians using standard hand tools sized for the 3/8-16 thread. De-energize or lock out any powered equipment before installing or removing spring plungers in active machinery. The locking element should be fully engaged to the mating bore upon installation to prevent loosening under load. Do not exceed the rated final end force when selecting this plunger for a given application.