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Carr Lock® Liner Bushings

Carr Lock System

The Carr Lock® System requires that each fixture plate have one mounting hole designated as the primary reference hole (Primary Liner Bushing) and one mounting hole designated as the secondary reference hole (Secondary Liner Bushing or Slotted Locator Bushing). All other mounting holes should be drilled clearance holes used for clamping only, not locating.

Primary Liner Bushings have a tight ID (+.0002/+.0007" tolerance) to provide precise reference in two-axes.
Secondary Liner Bushings have an extra .001" ID clearance (+.0012/+.0017" tolerance) to avoid binding.
Slotted Locator Bushings have a tight ID tolerance in one direction and full relief in the perpendicular direction. Slotted Locator Bushings provide better accuracy than Secondary Liner Bushings, but take a few extra steps to install, and are available only in 16, 20, and 25mm ID sizes.

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