Go and No-Go plug gages for internal involute splines, checking full composite error and functional (effective) size in a single pass. Cut on CNC gear machines, hardened to 62–63 HRC, then hand-lapped and polished for a superior finish and long service life.

• Internal involute splines — DP or module pitch
• Checks composite error, tooth form, pitch, and effective/actual size
• Go + No-Go set, certified in-house