... Japanese NTN V Groove Ball Bearing 6304 Z 6304 ZZ 1.Single box 2.Competitive ... Germany, carbon steel, iron. 4) Shield / Closure: Plain (Open), Z, ZZ, RS, 2RS, 2ZR, 2Z. 5) Vibration and Noisy ... ABEC-3, ABEC-5, ABEC-7. The company promises: 1) Our company insists on the "quality first, credit first" ... of cooperation. Deep groove ball bearing (ZZ, 2RS ,Z ,RS)604 series605 606 607 608 609623 series623 624 ...