Vlier NDL56 Threaded Ball Plunger 5/16-18 Delrin Nylon

Product Description

The VLIER NDL56 is a threaded ball plunger designed for light-duty indexing, positioning, and detent applications in mechanical assemblies. It features a Delrin body with a 5/16-18 thread and a Nylon ball measuring 0.156 inches in diameter. The body length is 0.578 inches with a maximum ball reach of 0.039 inches. Initial end force is 2 pounds, with a final end force of 4.5 pounds. This plunger is installed by machinists, tool-and-die technicians, and mechanical assembly professionals wherever a low-force, repeatable positioning solution is required.

The NDL56 suits applications in light industrial machinery, jigs, fixtures, and tooling assemblies where a non-locking ball plunger with controlled spring force is needed. Its Nylon ball and Delrin body make it appropriate for situations where metal-on-metal contact must be avoided or where plastic-safe, low-friction detent action is preferred. Typical scenarios include slide positioning, panel retention, and drawer or tray indexing in both production and maintenance environments.

Key Features

• 5/16-18 threaded body for standard tapped-hole installation
• Delrin body construction for corrosion resistance and lightweight performance
• Nylon ball provides low-friction, non-marring contact surface
• 2 pound initial end force and 4.5 pound final end force for light detent applications
• 0.039 inch maximum ball reach for controlled engagement depth
• No locking element - free-spinning for straightforward installation and removal

Compatibility

Designed as an OEM-style replacement or standard component for mechanical assemblies requiring a 5/16-18 threaded ball plunger with a non-locking Delrin body and Nylon ball.

Installation Notes

Installation requires a tapped 5/16-18 hole in the mating component. Use a standard hex key or appropriate driver on the body; do not overtighten, as Delrin threads can be damaged by excessive torque. Ensure the assembly is de-energized and depressurized before servicing any fixture or machinery incorporating this plunger. Confirm ball reach and end force values are compatible with the detent load requirements of the application before installation.