Bearing clearance classes C2, CN, C3 and C4

The bearing clearance classes for deep groove ball bearings determine the operating clearance in the interaction of the shaft and housing fit as well as the operating temperature.

On this page, you will find the technical specifications for radial internal clearance (C2 to C4).

A general overview of the series can be found in the ball bearing table.

Please note: “Normal bearing clearance” (CN) is also often designated as C0 and should be understood as synonymous. This bearing clearance class is usually omitted from order designations.

For ball bearings with a shaft diameter < 10mm, some manufacturers use an additional, more detailed classification with the designations MC1 to MC6. See the link at the end of the article.

Nominal bore diameter d		C2		CN		C3		C4
Nominal bore diameter d		Radial internal clearance in μm
over	up to	min.	max.	min.	max.	min.	max.	min.	max.
1,5	6	0	7	2	13	8	23	–	–
6	10	0	7	2	13	8	23	14	29
10	18	0	9	3	18	11	25	18	33
18	24	0	10	5	20	13	28	20	36
24	30	1	11	5	20	13	28	23	41
30	40	1	11	6	20	15	33	28	46
40	50	1	11	6	23	18	36	30	51
50	65	1	15	8	28	23	43	38	61
65	80	1	15	10	30	25	51	46	71
80	100	1	18	12	36	30	58	53	84
100	120	2	20	15	41	36	66	61	97
120	140	2	23	18	48	41	81	71	114
140	160	2	23	18	53	46	91	81	130
160	180	2	25	20	61	53	102	91	147
180	200	2	30	25	71	63	117	107	163
200	225	2	35	25	85	75	140	125	195
225	250	2	40	30	95	85	160	145	225
250	280	2	45	35	105	90	170	155	245
280	315	2	55	40	115	100	190	175	270
315	355	3	60	45	125	110	210	195	300
355	400	3	70	55	145	130	240	225	340
400	450	3	80	60	170	150	270	250	380
450	500	3	90	70	190	170	300	280	420
500	560	10	100	80	210	190	330	310	470
560	630	10	110	90	230	210	360	340	520
630	710	20	130	110	260	240	400	380	570
710	800	20	140	120	290	270	450	430	630
800	900	20	160	140	320	300	500	480	700
900	1000	20	170	150	350	330	550	530	770
1000	1120	20	180	160	380	360	600	580	850
1120	1250	20	190	170	410	390	650	630	920
1250	1400	30	200	190	440	420	700	680	990
1400	1600	30	210	210	470	450	750	730	1060