This standard specifies the size series of clutch friction surfaces. This standard applies to mechanical friction clutch surfaces of various automobiles, tractors, construction machinery, gearboxes, etc. The geometric shape of the clutch surface is an overall circular ring. This standard does not apply to other shapes of surfaces. This standard does not involve the surface structure type of the friction surface.
JB/T 9190-1999 history
1999JB/T 9190-1999 Size of friction face sheets for clutch