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                                                                             TECHNICAL INFORMATION

     3.4. Taps classes and inner thread’s tolerance zone

                  Taps o ffe re d in o u r c a ta lo g u e a re p ro d u ce d in th e b a s ic cla s s d e stin e d fo r th e m o s t co m m o n use o f in n e r
     thread: fo r m etric thread - 6H, fo r unified threads UNC, UNF -2 B , fo r W hitw orth threads BSW , BSF - „norm al” .
     P roducing in o th e r cla sse s can be d o n e by order.
     Taps classes (i.e. w orking part tolerance zones) fo r m etric thread are unified by international and dom estic
     standards. The determ ined tap class allow s to obtain the threads o f tw o o r three tolerance zones (see picture and
     table below).

       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  DIN 802

     1A IS01 4H                    4H 5H                                  -  -                   -

     2A IS02 6H 4G 5G 6H                                                     -                   -

     3A IS03 6G                    -  - 6G 7H 8H

     - - 7G* - - - 7G 8G

     *) 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. Insuch situation the symbol ofthe tap's classwith the sign “X”, e.g. 6HX, 6GX isobligatory.

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