This standard covers the requirements for nonseparable antifriction roller bearings. Classification Bearings shall be of the following types as specified (see 6.2): Type I Bearing@ roller@ self-aligning@ single row@ airframe@ antifriction@ sealed Type II Bearing@ roller@ self-aligning@ double row@ airframe@ antifriction@ sealed Type III Bearing@ roller@ self-aligning@ double row@ wide inner ring@ airframe@ antifriction@ sealed Type IV Bearing@ roller@ self-aligning@ double row@ torque tube@ airframe@ antifriction@ sealed