A Spline Relation Checking Gauge is a specialized inspection tool used to verify the positional relationship between a spline’s teeth and another feature on the part — such as a keyway, slot, hole, face, or another spline. It’s not just checking whether the spline teeth are correct in size and profile (that’s for GO/NO-GO spline gauges), but rather whether the spline is in the correct angular orientation relative to another datum.

To check angular indexing accuracy between spline teeth and other critical features. To ensure correct phase relationship in multi-feature components. To verify compliance with design tolerances before assembly.