FLUTELESS TAPS R GRADE LIMITE
HHG R grade system is made by using the datum 12.7μm(0.005inch) in a step
form in accordance with ANSI standard, the limits are established by increments
of 12.7μm, the upper limit of R grade is decided by rounding off the grade, No x
12.7μm to 1 decimal.
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Upper limit：12.7 μm × N |
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Lower limit：12.7 μm × N-12.7 μm |
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(N=R Number) |
