Vlier DB56N Threaded Ball Plunger 5/16-18 Steel Nylon

Product Description

The VLIER DB56N is a threaded ball plunger designed for controlled end-force applications in mechanical assemblies, fixtures, and positioning systems. The body is steel with a zinc-plated finish, and the ball is nylon with a diameter of 0.156 inches. Thread size is 5/16-18. The body measures 0.578 inches in length, with a maximum ball reach of 0.04 inches. An initial end force of 4 pounds and a final end force of 9 pounds provide predictable, repeatable detent action. A built-in locking element secures the plunger in position after installation, preventing loosening under vibration or repeated cycling.

This ball plunger is suited for use in tooling, jigs, fixtures, machine components, and light industrial positioning applications where a controlled detent or indexing force is required. The nylon ball minimizes surface marking on mating parts, making it appropriate for assemblies where contact-surface protection matters. The purple color code aids in quick identification during assembly and maintenance operations.

Key Features

• 5/16-18 thread size for standard installation into threaded holes
• Steel body with zinc-plated finish for corrosion resistance
• Nylon ball, 0.156 inches diameter, reduces marking on mating surfaces
• 4-pound initial end force and 9-pound final end force for controlled detent action
• Locking element prevents backing out under vibration or repeated use
• Purple color code for fast visual identification during assembly

Compatibility

Designed as a standard 5/16-18 threaded ball plunger for use in tooling, fixtures, and mechanical assemblies requiring controlled end-force detent function.

Installation Notes

Installation is performed by threading the DB56N into a pre-tapped 5/16-18 hole using an appropriate hex key or driver. Ensure the mating bore is clean and properly tapped to the correct depth before installation. The locking element should be engaged to the specified torque range per the application requirement - do not overtighten, as this can damage the locking feature or the surrounding material. Depressurize or de-energize any assembly before servicing components in the same area.