Helical gears, Spur gears - Chao Chia Quality Level  

規格精  度  等  級
JIS(Japan) N0 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12
JIS-B1702-02(new)
JGMA(Japan)         1 2 3 4 5 6 7 8  
JIS(Japan)         0 1 2 3 4 5 6 7 8
JIS-B1702(old)
PRC(China) 0 1 2 3 4 5 6 7 8 9 10 11 12
GB10095~1009
ISO(International) 0 1 2 3 4 5 6 7 8 9 10 11 12
DIN(Germany)   1 2 3 4 5 6 7 8 9 10 11 12
 3960~3967
GOST(USSR)       3 4 5 6 7 8 9 10 11 12
BS(UK)           A1 A2 B C D      
FN(France)         A B C D E        
ANSI(USA)           4 3 2 1        
AGMA(USA)     16 15 14~13 12 10 10 8