Vlier D54 Threaded Ball Plunger 1/4-20 Delrin

Product Description

The VLIER D54 is a threaded ball plunger designed for controlled end-force applications in mechanical assemblies, fixtures, and positioning systems. The body is machined from Delrin, a durable acetal resin, and houses a stainless steel ball with a 0.125-inch diameter. The plunger threads in on a 1/4-20 thread, with an overall body length of 0.531 inches and a maximum ball reach of 0.03 inches. Initial end force is 2 pounds and final end force is 5 pounds, making this suitable for applications requiring repeatable, low-to-moderate detent force. Color coded purple for quick identification during assembly and maintenance.

Ball plungers like the D54 are used in tooling, jigs, fixtures, machine slides, and light-duty indexing applications where a spring-loaded ball is needed to locate, retain, or register a component. The 1/4-20 thread allows installation directly into tapped holes in metal, plastic, or composite assemblies. The Delrin body is well suited for environments where non-metallic contact surfaces are preferred, such as applications involving soft workpieces or where metal-to-metal contact must be avoided.

Key Features

• 1/4-20 threaded body for direct installation into standard tapped holes
• Stainless steel ball for corrosion resistance and smooth engagement
• Delrin acetal body reduces weight and provides non-metallic contact
• Controlled end force: 2 pounds initial, 5 pounds final
• 0.125-inch ball diameter with 0.03-inch maximum ball reach for precise detent action
• Purple color code for fast identification during assembly

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies, fixtures, and indexing systems requiring a 1/4-20 threaded ball plunger with controlled end force.

Installation Notes

Installation is performed by threading the D54 into a pre-tapped 1/4-20 hole using a hex key or appropriate driver. De-energize or lock out any powered or pressurized system before servicing any assembly that contains this plunger. Verify that the mating thread in the receiving component is clean and free of debris before installation to ensure proper seating and consistent force output. Do not over-torque the body, as Delrin can crack under excessive clamping load.