The procedures in ISO 6336 provide for the calculation of load capacity, based on pitting and tooth-root breakage. At pitch line velocities below 1 m/s the gear load capacity is often limited by abrasive wear (see other literature for information on the calculation for this).
BS EN ISO 6360-6:2004 history
2004BS EN ISO 6360-6:2004 Dentistry - Number coding system for rotary instruments - Specific characteristics of abrasive instruments