6304, 6304N, 6304Z, 6304ZZ, 6304-RZ, 6304-2RZ, 6304RS, 6304-2RS deep groove ball bearing Basic Information Structure : Deep Groove Type Ball Model Number: 6304  Number of Row: Single row deep groove ball bearing or double row deep groove ball bearing Material: iron,Gcr11, Gcr15 Similar type: 6304, 6304N, 6304Z, 6304ZZ, 6304-RZ, 6304-2RZ, 6304RS, 6304-2RS Quality standard: ISO 9001:2000 Service: OEM service accepted