Data was added for Gear Rack and Fine–Pitch Worms and Wormgears. The former AGMA
390.02 for Coarse–Pitch and Fine–Pitch Spur, Helical and Herringbone Gearing was
enhanced to offer a single, compatible classification system. The tolerance identifier “Q”
was added to indicate that the tolerances in 390.03 apply. If Q is not used as a prefix in the
quality number, tolerances in AGMA 390.01 and 390.02 applied.
ANSI/AGMA 2000–A88 was an update of those sections from AGMA 390.03 for parallel
axis gears only. Additionally, the formulas stated the tolerances in metric terms. The
content was revised, but basic tolerance levels were unchanged from AGMA 390.03. The
other material in AGMA 390.03 on Bevels and Worms was replaced by ANSI/AGMA
2009–A99 and ANSI/AGMA 2011 –A98, respectively. ANSI/AGMA 2000 was approved by
AGMAmembership in January 1988, and as a American National Standard Institute (ANSI)
standard on March 31 , 1 988.