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Metric Thread and Gauge Profile Metric Thread and Gauge Profile

Relation of tolerance position between screw thread classes and thread gauge classes in ISO(new JIS) and old JIS ■Internal threads and Limit gauges for internal threads

standard.Gauge for Pitch Dia. of internal threadGauge for Minor Dia. of Internal Thread
Tolerance zoneTolerance zone
for Pitch Dia, offor Minor Dia. of Limit plug Limit plug

■External threads and Limit gauges for external threads internal thread internal thread gauges for gauges for

Inspection Working Basic Major Dia. of external thread 10mm *Relation between tolerance zone of external thread and Class 2 that of limit gauges for external thread is shown.

*Pitch Dia. of external thread is virtual pitch Dia. *Pitch Dia. of screw ring gauge is simple pitch Dia.

Go Not Go Not Go Go Not Go Go

Pitch diameter tolerance and Minor diameter tolerance of internal thread Class 2 Class 2 Tolerance of screw plug gauge and plug gauge

Pitch diameter tolerance and Major diameter tolerance of external thread Minimum wear Tolerance of screw ring gauge and caliper gauge

Minimum wear Example：ISO M10X1.5/6H and old JIS M10x1.5/Class2
Basic Pitch Dia. of external thread 9.026mm
Example：ISO M10X1.5/6g and old JIS M10x1.5/Class2 *Relation between tolerance zone of internal thread and
Class 2 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
Basic Profile diameter.

Clearance

Tolerance zone Limit caliper Limit caliper Tolerance zone

for Major Dia.gauges forgauges forfor Picth Dia.
of externalInspection.Working.of external

thread thread

Go Not Go Go Not Go Gauge for Major Dia. of Extenal Thread Gauge for Pitch Dia. of Extenal Thread

Max Truncation

Min Truncation

Min Minor Dia. Max Minor Dia. . Only pitch diameter is described.

Basic Profile

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 fine screw threads JIS B 0253-1985 Gauges for taper pipe threads JIS B 0254-1985 Gauges for parallel pipe threads

Technical Inf JIS B 0255-1975 Limit gauges for unified coarse screw threads JIS B 0256-1975 Limit gauges for unified fine screw threads