This standard specifies the type, size, marking and length measurement method of synchronous belts for general transmissions. This standard does not apply to arc-toothed synchronous belts and automotive synchronous belts.
GB/T 11616-1989 history
2013GB/T 11616-2013 Synchronous belt drives.Belts with pitch codes.MXL, XXL, XL, L, H, XH and XXH.Synchronous belt dimensions