We can offer both chrome steel bearing and carbon steel bearing to you
Inner diameter:4mm,outside diameter:12mm,thickness:4mm

Deep groove ball bearing 604-609 series
1. Deep groove ball bearing(604-609)
2. Deep groove ball bearing with dust cap in on side (604z-609z)
3. Deep groove ball bearing with dust caps in both two sides (604zz-609zz)
4. Deep groove ball bearing with seal ring in one side (604RS-609RS)
5. Deep groove ball bearing with seal rings on both two sides (604-2RS-609-2RS)
Feature
Deep groove ball bearing usually with simple and easy structure, so it is also easier for maintenance. It's mainly used for carrying radial load, also can endure certain amount of axial load, while the radial wind age of bearing is increasing, it also can stand biggish amount of radial load just as angular contact ball bearings.