A Straight Spline Plug Gauge is a precision measuring tool used to check the dimensional accuracy and fit of internal straight splines (female splines) in hubs, gears, couplings, or other components. It is the opposite of a spline ring gauge, which checks external splines. “Straight” refers to straight-sided teeth instead of an involute tooth profile.

Production line: Use spline gages in manufacturing to validate that splines adhere to specified tolerances and meet quality standards before assembly.