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OEM Part Number: 51216600
4202 Double Row Open Ball Bearing
and better resistance to heat compared to traditional all-steel bearings
SR1038ZZ ABEC-5 High Speed Ball Bearing
the 6301ZZENR outer diameter is 37mm
KT121820 - Needle Roller Bearing Cage - 12x18x20mm Inner Diameter - 7/8 inch (0.875") OEM Part Number: 51216600KT121820 Needle Roller Cage Bearing High Load, Compact Design 12mm ID 18mm OD 20mm Wide The KT121820 is a precision needle roller cage bearing designed for tight, space limited applications that demand high load capacity and smooth rotation. With its open cage design and compact form, it's perfect for gearboxes, transmissions, and high performance mechanical assemblies under intense radial forces. Type: Needle roller cage bearing Inside diameter: 12mm