Spline ring gauges are precision measuring tools used to inspect the external dimensions of spline shafts and the internal dimensions of corresponding components. They are essential for ensuring the accuracy and proper fit of splined parts in various industries, especially in mass production settings.

Usage with Splined Shafts: For a splined shaft like the planetary pinion shaft shown, a spline ring gauge would be used as a "Go/No-Go" gauge. The "Go" gauge should fit over the spline, while the "No-Go" gauge should not, indicating that the shaft's splines are within the acceptable tolerance range for effective tooth thickness and form diameter.