Vlier ND56 Threaded Ball Plunger 5/16-18 Delrin Nylon

Product Description

The VLIER ND56 is a threaded ball plunger designed for controlled end-force applications in mechanical assemblies, fixtures, and positioning equipment. The plunger features a Delrin body with a 5/16-18 thread and a Nylon ball measuring 0.156 inches in diameter. Body length is 0.578 inches with a maximum ball reach of 0.039 inches. Initial end force is 4 pounds, with a final end force of 9 pounds. The white color-coded body aids quick identification in multi-component assemblies. This part is installed by machinists, maintenance technicians, and mechanical assemblers working on indexing mechanisms, tooling fixtures, and precision positioning hardware.

The ND56 is suited for light-duty controlled end-force applications where a non-locking threaded ball plunger is required. Typical installations include jigs, fixtures, cabinet hardware, and tooling components where repeatable detent action or part retention is needed without a locking element. The Nylon ball and Delrin body make this plunger appropriate for applications requiring non-marring contact on sensitive surfaces or where metal-to-metal contact must be avoided.

Key Features

• 5/16-18 threaded body for standard installation into tapped holes
• Delrin body construction for chemical resistance and dimensional stability
• Nylon ball provides non-marring, low-friction contact
• Controlled end force: 4 pounds initial, 9 pounds final
• 0.156 inch ball diameter with 0.039 inch maximum ball reach
• White color code for fast visual identification in multi-plunger assemblies
• No locking element - simplified installation and removal

Compatibility

Designed as a standard threaded ball plunger for use in any application requiring a 5/16-18 tapped hole and controlled end-force detent action with non-metallic contact surfaces.

Installation Notes

Installation requires a properly tapped 5/16-18 through or blind hole in the mating component. Thread the plunger in by hand first, then use an appropriate driver to seat it to the desired depth controlling preload. Ensure the mating surface and bore are free of debris before installation. No special tooling or trade licensing is required, but standard machining and assembly practices apply.