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the NU312MY outer diameter is 130mm
making it ideal for clean environments or externally lubricated systems
OD (outer diameter): 105mm
here are the dimensions of the 7212CYP5
Bearing Single-Row Deep Groove Ball Bearing
3/4" Ball Bearing - 1/2 diameter integrated 1 1/4 Long Axle Inner Diameter - 2 3/16 inch (2.1875") the NU312MY outer diameter is3 4" Inch Ball Bearing with 1 2" diameter integrated 1 2" Inch (12. 7mm) Pin Diameter 1 2" x 3 4" x 1 1 4" Inch 3 4" inch (19. 05mm) Ball Bearing with 1 2" inch (12. 7mm) diameter integrated 1 1 4" inch (31. 75mm) Long Axle, Pin Diameter is 1 2" inch, Bearing Outer diameter is 3 4" Inch (19. 05mm), and Width of the assembly is 1 1 4" Inch (31. 75mm Long), made from durable 52100 alloy steel, commonly known as chrome steel. 1 2" x 3 4" x 1 1 4" Ball