The Meritor capscrew S21420A2 is a genuine Meritor fastener for heavy-duty truck differential and drivetrain applications. As an OEM Meritor part, it is the correct replacement when rebuilding or servicing Meritor and Rockwell-branded axle and differential assemblies. Because capscrews are torque-critical fasteners, using the exact specified part number matters for proper clamping load and thread engagement. The S21420A2 is sold by Pro Gear and Transmission. Not sure this is the right capscrew for your application? Give us a call before ordering.FeaturesGenuine Meritor OEM capscrew, part number S21420A2Designed for use in Meritor and Rockwell axle and differential assembliesCritical torque-fastener application requires exact part number matchSold by Pro Gear and Transmission