Open type	Shielded/sealed type	With locating snap ring	Maximum type	Double-row
	ZZ 2RU 2RS 2RD	NR	With filling slot
680 , 690 , 600 , 620 , 630 , (ML) Extra-small, miniature bearing 6800 , 6900 , 16000, 6000 , 6200 , 6300 , 6400			M6200 M6300	4200 4300

The most popular types among rolling bearings, widely used in a variety of industries. Radial load and axial load in both directions can be accommodated. Suitable for operation at high speed, with low noise and low vibration. Sealed bearings employing steel shields or rubber seals are filled with the appropriate volume of grease when manufactured.