Product Code:SAE J1731 Title:Pilot Bearings for Truck and Bus Applications Issuing Committee:T And B Clutch, Transmission And Power Take-Off Committee Scope:This SAE Recommended Practice describes STANDARD-DUTY and EXTREME-DUTY Pilot Bearing requirements and sizes for class 6, 7, and 8 on-highway trucks and buses that use diesel engines and manual transmissions. The recommendations may apply to a wide range of other pilot-bearing applications, such as agricultural, industrial, and construction equipment.