THREAD PITCH GAUGE: KEEP METRIC PITCH, TPI AND PART IDENTITY TOGETHER Vehicle / component / original part / location: Gauge set / thread family / leaf marking: Metric pitch or TPI convention / original observation: Diameter / instrument / units: Geometry / source / candidate designation: Required part reference / unresolved question / next authorized check: Documentation aid only. Follow applicable vehicle, product and instrument instructions. Not a calibration certificate, real measurement or service authorization.