Volkel M18 x 2.5 Ring Thread Gauge Ring Gauge, 2.5mm Pitch Diameter, PreCal - 16201 +Cal

The GO thread ring gauge must be possible to manually screw into the entire thread of the part (without using excessive force). If unable to do so, the thread does not meet the requested standards (=scrap). The reference temperature for parts and gauges is 20° Celsius. Calibrated at a measurement laboratory separate from VÖLKEL using IAC thread scanners.