GO screw pIug gaug NOT GO screw pIug gauge 6H Class 2 Go PIug gauge (Both for working and inspection) NOT GO inspection plug gauge NOT GO Working plug gauge Plain GO pIug gauge Plain NOT GO plug gauge 6H Class 2 Description of productsTechnical Information Metric Thread and Gauge Pro le ■Internal threads and Limit gauges for internal threads Gauge for Pitch Dia. of internal thread Gauge for Minor Dia. of Internal Thread Tolerance zone Tolerance zone for Pitch Dia, of for Minor Dia. of Limit plug Limit plug internal thread internal thread gauges for gauges for Inspection Working Pitch diameter tolerance and Minor diameter Go Not Go Not Go Go Not Go Go tolerance of internal thread Class 2 Class 2 Tolerance of screw plug gauge and plug gauge Minimum wear Example:ISO M10X1.5/6H and old JIS M10x1.5/Class2 *Relation between tolerance zone of internal thread and that of limit gauges for internal thread is shown : *Pitch diameter of internal thread is virtual pitch diameter. *Pitch diameter of screw plug gauge is simple pitch diameter. Clearance Basic Pro le Basic Pitch Dia. of internal thread 9.026mm Note : The allowance and tolerance should be described as 1/2 scale but is simply described in the size of actual diameter. Basic Minor Dia. of internal thread 8.376mm Limit gauges for screw threads JIS B 0251-2008 Limit gauges for metric screw threads JIS B 0251-1975 Limit gauges for metric coarse screw threads Appendix JIS B 0252-1996 Limit gauges for metric ne screw threads JIS B 0253-1985 Gauges for taper pipe threads JIS B 0254-1985 Gauges for parallel pipe threads JIS B 0255-1975 Limit gauges for uni ed coarse screw threads JIS B 0256-1975 Limit gauges for uni ed ne screw threads Technical-10