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                                                                   TECHNICAL INFORMATION

3.4. Taps classes and inner thread’s tolerance zone

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  Internal thread                 Tap tolerance limits                 Internal thread
Tolerance H limits                                                   Tolerance G limits

                                                                              8G

Tolerance class of the tap
  according to standard:

 PN -72     PN -92                Tolerance range of the internal thread
M - 57800  M - 57800
                      DI1N14 802  4H 5H -                            -                   -
  1A        IS01                                                                         -
                       4H                                                                8H
                                                                                         8G
2A IS02 6H                        4G 5G 6H -

ЗА IS03 6G                        - - 6G 7H
- - 7G*
                                  - - - 7G

*) Polish Standard following the international standard ISO, provides only three classes of taps, whereas the standard DIN 802
introduces additionally the fourth class 7G for “loose” threads. Furthermore, the standard DIN 802 provides the possibility of
correction the tap tolerance comparing to the standard demands in case when it is required by the particular machining conditions,
e.g. the sort of machining material. In such situation the symbol of the tap’s class with the sign “X”, e.g. 6HX, 6GX is obligatory.

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