The Backbone Of CNC Fixturing

author: Fiona Yang

2025-08-23

The Backbone Of CNC Fixturing

A fastener is more than just a piece of metal that holds a part in place. It's meticulously designed to ensure precision, achieve repeatability, prevent deformation, and, most importantly, maximize uptime by enabling quick part replacement. It's no exaggeration to say that fixtures are the backbone of CNC jigs. Today, we'll focus on two such specialized fasteners: indexing plungers and ball locking pins.

Indexing Plungers:

The indexing plunger is a mechanical marvel, designed primarily to provide extremely precise and repeatable positioning. It consists of a spring-loaded pin that engages a corresponding hole or slot in the part or baseplate. Manually pull and turn a knob to retract the pin, position the part, and then release the knob. An internal mechanism ensures that the pin extends only when its tip is perfectly aligned with the hole, ensuring a perfect seat every time.

Index Bolt

Ball Locking Pins:

These pins feature an ingenious internal mechanism. When you press a button on the handle, a series of precision balls within the pin's stem retract, allowing it to slide in effortlessly. Once fully inserted, releasing the handle forces the tapered actuator behind the ball bearing to lock it outward into the matching groove in the bushing. This creates an extremely strong, rigid connection. Heavy-duty fixture plates can be replaced in seconds. This is the core technology behind modern pallet changers and zero-point mounting systems. The ball lock mechanism provides vise-like clamping force, far superior to threaded fixtures, eliminating any micro-motion that could damage close-tolerance parts.

From robust ball lock pins for quick and secure clamping to precision indexing plungers for accurate calibration, we have the specialized fasteners your shop needs.

Quick Release Push Botton Pins

While components like indexing plungers and ball locking pins are often overlooked, they're more than just accessories; they're fundamental, enabling technology. Contact us to learn more!

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