H GRADE LIMITS
HHG, H grade system for thread limits is specified in reference with TAS (The
Japan small tool makers association standard), most of the HHG ground finished
taps use this limit system, on pitch diameter tolerance zone for pitch size are as
follows.
|
Pitch |
Pitch dia tolerance |
|
1. P≦0.6 (40山以上) P≦0.6(T.P.I≧40) |
15 µm |
|
2. P≧0.7 (36山以下) P≧0.7(T.P.I≦36) |
20 µm |