Vlier NM57 Threaded Spring Plunger 5/16-18 Steel

Product Description

The VLIER NM57 is a stubby threaded spring plunger designed to provide controlled, repeatable positioning or detent force in mechanical assemblies. It features a 5/16-18 thread with a 0.562-inch thread length, a steel body, and a Delrin nose that reduces friction and wear against mating surfaces. The plunger projects 0.084 inches at maximum travel with an initial end force of 1.25 pounds and a final end force of 4 pounds, giving technicians and assemblers a predictable, consistent engagement feel. It ships as a single unit and is installed by machine builders, maintenance technicians, and tool and die professionals.

This spring plunger is suited for light-duty positioning applications in fixtures, jigs, machine tool components, and enclosures where a compact, stubby profile is required. The 5/16-18 thread allows installation into standard threaded bores without special tooling. The Delrin nose is appropriate for applications requiring contact with softer materials or where metal-to-metal contact must be avoided. No locking element is included, making it straightforward to remove or replace during maintenance cycles.

Key Features

• Stubby plunger profile - 0.562-inch body length suits tight-clearance installations
• 1.25-pound initial end force and 4-pound final end force for light positioning detent applications
• Delrin nose reduces friction and protects mating surfaces from scoring
• Steel body provides durability in industrial and mechanical assembly environments
• Standard 5/16-18 thread installs into common threaded bores without special tooling
• No locking element - allows straightforward removal and replacement

Compatibility

Designed as a direct-fit threaded spring plunger for standard 5/16-18 threaded bores in fixtures, jigs, machine tool components, and mechanical assemblies requiring a stubby-length plunger.

Installation Notes

Installation is performed by machine builders, maintenance technicians, or tool and die professionals using a standard hex wrench or spanner appropriate for the body size. De-energize or lock out any equipment before servicing assemblies containing this plunger. Do not overtighten the body into the threaded bore, as this can distort the spring mechanism or damage the Delrin nose. Inspect the plunger for smooth travel and proper projection before returning the assembly to service.