Operating clearance

Table 10-1 How to determine operating clearance

Operating clearance（S）	S＝S_o－（S_f＋S_t1＋S_t2）＋S_w^※ ^※S_w (increase of clearance due to load) is generally small, and thus may be ignored, although there is an equation for determining the value.
Decrease of clearance due to fitting（S_f）
Decrease of clearance due to temperature differentials between inner and outer rings（S_t1）	The amount of decrease varies depending on the state of housing; however, generally the amount can be approximated by the following equation on the assumption that the outer ring will not expand : S_t1＝α（D_i・t_i－D_e・t_e）	where :D_e＝D_i＋2D_w Consequently,S_t1＋S_t2will be determined by the following equation : S_t1＋S_t2＝α・D_i・t₁＋2α・D_w・t₂ （Temperature differential between the inner and outer rings, t₁, can be expressed as follows : t₁＝t_i－t_e Temperature differential between the rolling element and outer ring, t₂, can be expressed as follows : t₂＝t_w－t_e）
Decrease of clearance due to temperature rise of rolling element（S_t2）	S_t2＝2α・D_w・t_w

In Table 10-1,

Bearings are sometimes used with a non-steel shaft or housing.
In the automotive industry, a statistical method is often incorporated for selection of clearance. In these cases, or when other special operating conditions are involved, JTEKT should be consulted.

Table 10-2 Radial internal clearance of deep groove ball bearings (cylindrical bore)

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		C 2		C N		C 3		C 4		C 5
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
2.5	6	0	7	2	13	8	23	14	29	20	37
6	10	0	7	2	13	8	23	14	29	20	37
10	18	0	9	3	18	11	25	18	33	25	45
18	24	0	10	5	20	13	28	20	36	28	48
24	30	1	11	5	20	13	28	23	41	30	53
30	40	1	11	6	20	15	33	28	46	40	64
40	50	1	11	6	23	18	36	30	51	45	73
50	65	1	15	8	28	23	43	38	61	55	90
65	80	1	15	10	30	25	51	46	71	65	105
80	100	1	18	12	36	30	58	53	84	75	120
100	120	2	20	15	41	36	66	61	97	90	140
120	140	2	23	18	48	41	81	71	114	105	160
140	160	2	23	18	53	46	91	81	130	120	180
160	180	2	25	20	61	53	102	91	147	135	200
180	200	2	30	25	71	63	117	107	163	150	230
200	225	2	35	25	85	75	140	125	195	175	265
225	250	2	40	30	95	85	160	145	225	205	300
250	280	2	45	35	105	90	170	155	245	225	340
280	315	2	55	40	115	100	190	175	270	245	370
315	355	3	60	45	125	110	210	195	300	275	410
355	400	3	70	55	145	130	240	225	340	315	460

[Remarks]

For measured clearance, the increase of radial internal clearance caused by the measurement load should be added to the values in the above table for correction. Amounts for correction are as shown below. Of the amounts for clearance correction in the C 2 column, the smaller is applied to the minimum clearance, the larger to the maximum clearance.
Values in Italics are prescribed in JTEKT standards.

Nominal bore diameter d，mm		Measurement load N	Amounts of clearance correction, µm
over	up to	Measurement load N	C 2	C N	C 3	C 4	C 5
2.5	18	24.5	3～4	4	4	4	4
18	50	49	4～5	5	6	6	6
50	280	147	6～8	8	9	9	9

Table 10-3 Radial internal clearance of extra-small/miniature ball bearings

Unit：µm
Clearance code	M 1		M 2		M 3		M 4		M 5		M 6
Clearance code	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
Clearance	0	5	3	8	5	10	8	13	13	20	20	28

[Remark]
For measured clearance, the following amounts should be added for correction.

Measurement load, N	Amounts of clearance correction, µm
Extra-small ball bearing / Miniature ball bearing	M1	M2	M3	M4	M5	M6
2.3	1	1	1	1	1	1

（Extra-small ball bearing
9 mm or larger in outside diameter and under 10 mm in bore diameter）
（Miniature ball bearing
under 9 mm in outside diameter）

Table 10-4 Axial internal clearance of matched pair angular contact ball bearings (measurement clearance)^1）

Unit：µm
Nominal bore diameter d，mm		Contact angle : 15°				Contact angle : 30°								Contact angle : 40°
Nominal bore diameter d，mm		C 2		C N		C 2		C N		C 3		C 4		C 2		C N		C 3		C 4
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
-	10	13	33	33	53	3	14	10	30	30	50	50	70	2	10	6	18	16	30	26	40
10	18	15	35	35	55	3	16	10	30	30	50	50	70	2	12	7	21	18	32	28	44
18	24	20	40	45	65	3	20	20	40	40	60	60	80	2	12	12	26	20	40	30	50
24	30	20	40	45	65	3	20	20	40	40	60	60	80	2	14	12	26	20	40	40	60
30	40	20	40	45	65	3	20	25	45	45	65	70	90	2	14	12	26	25	45	45	65
40	50	20	40	50	70	3	20	30	50	50	70	75	95	2	14	12	30	30	50	50	70
50	65	30	55	65	90	9	27	35	60	60	85	90	115	5	17	17	35	35	60	60	85
65	80	30	55	70	95	10	28	40	65	70	95	110	135	6	18	18	40	40	65	70	95
80	100	35	60	85	110	10	30	50	75	80	105	130	155	6	20	20	45	55	80	85	110
100	120	40	65	100	125	12	37	65	90	100	125	150	175	6	25	25	50	60	85	100	125
120	140	45	75	110	140	15	40	75	105	120	150	180	210	7	30	30	60	75	105	125	155
140	160	45	75	125	155	15	40	80	110	130	160	210	240	7	30	35	65	85	115	140	170
160	180	50	80	140	170	15	45	95	125	140	170	235	265	7	31	45	75	100	130	155	185
180	200	50	80	160	190	20	50	110	140	170	200	275	305	7	37	60	90	110	140	170	200

[Note]
1）Including increase of clearance caused by measurement load.

Table 10-5 Radial internal clearance of double-row angular contact ball bearings

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		CD2		CDN		CD3
over	up to	min.	max.	min.	max.	min.	max.
2.5	10	0	7	2	10	8	18
10	18	0	7	2	11	9	19
18	24	0	8	2	11	10	21
24	30	0	8	2	13	10	23
30	40	0	9	3	14	11	24
40	50	0	10	4	16	13	27
50	65	0	11	6	20	15	30
65	80	0	12	7	22	18	33
80	100	0	12	8	24	22	38
100	120	0	13	9	25	24	42
120	140	0	15	10	26	25	44
140	160	0	16	11	28	26	46
160	180	0	17	12	30	27	47
180	200	0	18	14	32	28	48

[Remark]
Regarding deep groove ball bearings and matched pair and double-row angular contact ball bearings, equations of the relationship between radial internal clearance and axial internal clearance are shown on page A 111.

Table 10-6 Radial internal clearance of self-aligning ball bearings

Unit：µm
Nominal bore diameter d，mm		Cylindrical bore bearing clearance										Tapered bore bearing clearance
Nominal bore diameter d，mm		C 2		C N		C 3		C 4		C 5		C 2		C N		C 3		C 4		C 5
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
2.5	6	1	8	5	15	10	20	15	25	21	33	-	-	-	-	-	-	-	-	-	-
6	10	2	9	6	17	12	25	19	33	27	42	-	-	-	-	-	-	-	-	-	-
10	14	2	10	6	19	13	26	21	35	30	48	-	-	-	-	-	-	-	-	-	-
14	18	3	12	8	21	15	28	23	37	32	50	-	-	-	-	-	-	-	-	-	-
18	24	4	14	10	23	17	30	25	39	34	52	7	17	13	26	20	33	28	42	37	55
24	30	5	16	11	24	19	35	29	46	40	58	9	20	15	28	23	39	33	50	44	62
30	40	6	18	13	29	23	40	34	53	46	66	12	24	19	35	29	46	40	59	52	72
40	50	6	19	14	31	25	44	37	57	50	71	14	27	22	39	33	52	45	65	58	79
50	65	7	21	16	36	30	50	45	69	62	88	18	32	27	47	41	61	56	80	73	99
65	80	8	24	18	40	35	60	54	83	76	108	23	39	35	57	50	75	69	98	91	123
80	100	9	27	22	48	42	70	64	96	89	124	29	47	42	68	62	90	84	116	109	144
100	120	10	31	25	56	50	83	75	114	105	145	35	56	50	81	75	108	100	139	130	170
120	140	10	38	30	68	60	100	90	135	125	175	40	68	60	98	90	130	120	165	155	205
140	160	15	44	35	80	70	120	110	161	150	210	45	74	65	110	100	150	140	191	180	240

Table 10-7 Radial internal clearance of electric motor bearings

1) Deep groove ball bearing

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		CM
over	up to	min.	max.
10^1）	18	4	11
18	30	5	12
30	50	9	17
50	80	12	22
80	120	18	30
120	160	24	38

[Note]
1）10 mm is included.

[Remark]
To adjust for change of clearance due to measuring load, use correction values shown in Table 10-2.

2) Cylindrical roller bearing

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		Interchangeability CT		Non-interchangeability CM
over	up to	min.	max.	min.	max.
24	40	15	35	15	30
40	50	20	40	20	35
50	65	25	45	25	40
65	80	30	50	30	45
80	100	35	60	35	55
100	120	35	65	35	60
120	140	40	70	40	65
140	160	50	85	50	80
160	180	60	95	60	90
180	200	65	105	65	100

[Note]
"Interchangeability" means interchangeable only among products (sub-units) of the same manufacturer ; not with others.

Table 10-8 Radial internal clearance of cylindrical roller bearings and machined ring needle roller bearings

(1) Cylindrical bore bearing

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		C 2		C N		C 3		C 4		C 5
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
-	10	0	25	20	45	35	60	50	75	-	-
10	24	0	25	20	45	35	60	50	75	65	90
24	30	0	25	20	45	35	60	50	75	70	95
30	40	5	30	25	50	45	70	60	85	80	105
40	50	5	35	30	60	50	80	70	100	95	125
50	65	10	40	40	70	60	90	80	110	110	140
65	80	10	45	40	75	65	100	90	125	130	165
80	100	15	50	50	85	75	110	105	140	155	190
100	120	15	55	50	90	85	125	125	165	180	220
120	140	15	60	60	105	100	145	145	190	200	245
140	160	20	70	70	120	115	165	165	215	225	275
160	180	25	75	75	125	120	170	170	220	250	300
180	200	35	90	90	145	140	195	195	250	275	330
200	225	45	105	105	165	160	220	220	280	305	365
225	250	45	110	110	175	170	235	235	300	330	395
250	280	55	125	125	195	190	260	260	330	370	440
280	315	55	130	130	205	200	275	275	350	410	485
315	355	65	145	145	225	225	305	305	385	455	535
355	400	100	190	190	280	280	370	370	460	510	600
400	450	110	210	210	310	310	410	410	510	565	665
450	500	110	220	220	330	330	440	440	550	625	735

(2) Tapered bore bearing

Unit：µm
Nominal bore diameter d，mm		Non-interchangeable clearance
Nominal bore diameter d，mm		C 9 NA^1）		C 1 NA		C 2 NA		C N NA		C 3 NA		C 4 NA		C 5 NA
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
12	14	5	10	-	-	-	-	-	-	-	-	-	-	-	-
14	24	5	10	10	20	20	30	35	45	45	55	55	65	75	85
24	30	5	10	10	25	25	35	40	50	50	60	60	70	80	95
30	40	5	12	12	25	25	40	45	55	55	70	70	80	95	110
40	50	5	15	15	30	30	45	50	65	65	80	80	95	110	125
50	65	5	15	15	35	35	50	55	75	75	90	90	110	130	150
65	80	10	20	20	40	40	60	70	90	90	110	110	130	150	170
80	100	10	25	25	45	45	70	80	105	105	125	125	150	180	205
100	120	10	25	25	50	50	80	95	120	120	145	145	170	205	230
120	140	15	30	30	60	60	90	105	135	135	160	160	190	230	260
140	160	15	35	35	65	65	100	115	150	150	180	180	215	260	295
160	180	15	35	35	75	75	110	125	165	165	200	200	240	285	320
180	200	20	40	40	80	80	120	140	180	180	220	220	260	315	355
200	225	20	45	45	90	90	135	155	200	200	240	240	285	350	395
225	250	25	50	50	100	100	150	170	215	215	265	265	315	380	430
250	280	25	55	55	110	110	165	185	240	240	295	295	350	420	475
280	315	30	60	60	120	120	180	205	265	265	325	325	385	470	530
315	355	30	65	65	135	135	200	225	295	295	360	360	430	520	585
355	400	35	75	75	150	150	225	255	330	330	405	405	480	585	660
400	450	45	85	85	170	170	255	285	370	370	455	455	540	650	735
450	500	50	95	95	190	190	285	315	410	410	505	505	600	720	815

Table 10-9 Radial internal clearance of spherical roller bearings

(1) Cylindrical bore bearing

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		C 2		C N		C 3		C 4		C 5
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
14	18	10	20	20	35	35	45	45	60	60	75
18	24	10	20	20	35	35	45	45	60	60	75
24	30	15	25	25	40	40	55	55	75	75	95
30	40	15	30	30	45	45	60	60	80	80	100
40	50	20	35	35	55	55	75	75	100	100	125
50	65	20	40	40	65	65	90	90	120	120	150
65	80	30	50	50	80	80	110	110	145	145	180
80	100	35	60	60	100	100	135	135	180	180	225
100	120	40	75	75	120	120	160	160	210	210	260
120	140	50	95	95	145	145	190	190	240	240	300
140	160	60	110	110	170	170	220	220	280	280	350
160	180	65	120	120	180	180	240	240	310	310	390
180	200	70	130	130	200	200	260	260	340	340	430
200	225	80	140	140	220	220	290	290	380	380	470
225	250	90	150	150	240	240	320	320	420	420	520
250	280	100	170	170	260	260	350	350	460	460	570
280	315	110	190	190	280	280	370	370	500	500	630
315	355	120	200	200	310	310	410	410	550	550	690
355	400	130	220	220	340	340	450	450	600	600	750
400	450	140	240	240	370	370	500	500	660	660	820
450	500	140	260	260	410	410	550	550	720	720	900
500	560	150	280	280	440	440	600	600	780	780	1000
560	630	170	310	310	480	480	650	650	850	850	1100
630	710	190	350	350	530	530	700	700	920	920	1190
710	800	210	390	390	580	580	770	770	1010	1010	1300
800	900	230	430	430	650	650	860	860	1120	1120	1440
900	1000	260	480	480	710	710	930	930	1220	1220	1570

(2) Tapered bore bearing

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		C 2		C N		C 3		C 4		C 5
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
18	24	15	25	25	35	35	45	45	60	60	75
24	30	20	30	30	40	40	55	55	75	75	95
30	40	25	35	35	50	50	65	65	85	85	105
40	50	30	45	45	60	60	80	80	100	100	130
50	65	40	55	55	75	75	95	95	120	120	160
65	80	50	70	70	95	95	120	120	150	150	200
80	100	55	80	80	110	110	140	140	180	180	230
100	120	65	100	100	135	135	170	170	220	220	280
120	140	80	120	120	160	160	200	200	260	260	330
140	160	90	130	130	180	180	230	230	300	300	380
160	180	100	140	140	200	200	260	260	340	340	430
180	200	110	160	160	220	220	290	290	370	370	470
200	225	120	180	180	250	250	320	320	410	410	520
225	250	140	200	200	270	270	350	350	450	450	570
250	280	150	220	220	300	300	390	390	490	490	620
280	315	170	240	240	330	330	430	430	540	540	680
315	355	190	270	270	360	360	470	470	590	590	740
355	400	210	300	300	400	400	520	520	650	650	820
400	450	230	330	330	440	440	570	570	720	720	910
450	500	260	370	370	490	490	630	630	790	790	1000
500	560	290	410	410	540	540	680	680	870	870	1100
560	630	320	460	460	600	600	760	760	980	980	1230
630	710	350	510	510	670	670	850	850	1090	1090	1360
710	800	390	570	570	750	750	960	960	1220	1220	1500
800	900	440	640	640	840	840	1070	1070	1370	1370	1690
900	1000	490	710	710	930	930	1190	1190	1520	1520	1860

Table 10-10 Radial internal clearance of double/four-row and matched pair tapered roller bearings (cylindrical bore)

Unit：µm
Nominal bore diameter d，mm		Clearance
Nominal bore diameter d，mm		C 1		C 2		C N		C 3		C 4
over	up to	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
14	18	0	10	10	20	20	30	30	40	40	50
18	24	0	10	10	20	20	30	30	40	40	55
24	30	0	10	10	20	20	30	30	45	45	60
30	40	0	12	12	25	25	40	40	55	55	75
40	50	0	15	15	30	30	45	45	60	60	80
50	65	0	15	15	30	30	50	50	70	70	90
65	80	0	20	20	40	40	60	60	80	80	110
80	100	0	20	20	45	45	70	70	100	100	130
100	120	0	25	25	50	50	80	80	110	110	150
120	140	0	30	30	60	60	90	90	120	120	170
140	160	0	30	30	65	65	100	100	140	140	190
160	180	0	35	35	70	70	110	110	150	150	210
180	200	0	40	40	80	80	120	120	170	170	230
200	225	0	40	40	90	90	140	140	190	190	260
225	250	0	50	50	100	100	150	150	210	210	290
250	280	0	50	50	110	110	170	170	230	230	320
280	315	0	60	60	120	120	180	180	250	250	350
315	355	0	70	70	140	140	210	210	280	280	390
355	400	0	70	70	150	150	230	230	310	310	440
400	450	0	80	80	170	170	260	260	350	350	490
450	500	0	90	90	190	190	290	290	390	390	540
500	560	0	100	100	210	210	320	320	430	430	590
560	630	0	110	110	230	230	350	350	480	480	660
630	710	0	130	130	260	260	400	400	540	540	740
710	800	0	140	140	290	290	450	450	610	610	830
800	900	0	160	160	330	330	500	500	670	670	920

Table 10-11 Examples of non-standard clearance selection

Service conditions	Applications	Examples of clearance selection
In the case of heavy/impact load, large interference	Railway rolling stock axle journals	C 3
In the case of vibration/impact load, interference fit both for inner/outer rings	Shaker screens	C 3，C 4
	railway rolling stock traction motors	C 4
	tractor final reduction gears	C 4
When shaft deflection is large	Automobile rear wheels	C 5
When shaft and inner ring are heated	Dryers of paper making machines	C 3，C 4
When shaft and inner ring are heated	table rollers of rolling mills	C 3
When clearance fit both for inner/outer rings	Roll necks of rolling mills	C 2
When noise/vibration during rotation is to be lowered	Micro-motors	C 1，C 2，CM
When clearance after mounting is to be adjusted in order to reduce shaft runout	Lathe spindles	C 9 NA，C 1 NA

Table 10-1 How to determine operating clearance

Table 10-2 Radial internal clearance of deep groove ball bearings (cylindrical bore)

Table 10-3 Radial internal clearance of extra-small/miniature ball bearings

Table 10-4 Axial internal clearance of matched pair angular contact ball bearings (measurement clearance)^1）

Table 10-5 Radial internal clearance of double-row angular contact ball bearings

Table 10-6 Radial internal clearance of self-aligning ball bearings

Table 10-7 Radial internal clearance of electric motor bearings

1) Deep groove ball bearing

2) Cylindrical roller bearing

Table 10-8 Radial internal clearance of cylindrical roller bearings and machined ring needle roller bearings

(1) Cylindrical bore bearing

(2) Tapered bore bearing

Table 10-9 Radial internal clearance of spherical roller bearings

(1) Cylindrical bore bearing

(2) Tapered bore bearing

Table 10-10 Radial internal clearance of double/four-row and matched pair tapered roller bearings (cylindrical bore)

Table 10-11 Examples of non-standard clearance selection

[Reference] Relationship between radial internal clearance and axial internal clearance

[Deep groove ball bearing]

[Double-row angular contact ball bearing]

[Matched pair angular contact ball bearing]

[Double/four-row and matched pair tapered roller bearing]

What is Bearing?
(Beginner ～Intermediate )

Basic Idea to Select the Bearing
(Intermediate ～ Advanced)

Case Studies

Operating clearance

Table 10-1 How to determine operating clearance

Table 10-2 Radial internal clearance of deep groove ball bearings (cylindrical bore)

Table 10-3 Radial internal clearance of extra-small/miniature ball bearings

Table 10-4 Axial internal clearance of matched pair angular contact ball bearings (measurement clearance)1）

Table 10-5 Radial internal clearance of double-row angular contact ball bearings

Table 10-6 Radial internal clearance of self-aligning ball bearings

Table 10-7 Radial internal clearance of electric motor bearings

1) Deep groove ball bearing

2) Cylindrical roller bearing

Table 10-8 Radial internal clearance of cylindrical roller bearings and machined ring needle roller bearings

(1) Cylindrical bore bearing

(2) Tapered bore bearing

Table 10-9 Radial internal clearance of spherical roller bearings

(1) Cylindrical bore bearing

(2) Tapered bore bearing

Table 10-10 Radial internal clearance of double/four-row and matched pair tapered roller bearings (cylindrical bore)

Table 10-11 Examples of non-standard clearance selection

[Reference] Relationship between radial internal clearance and axial internal clearance

[Deep groove ball bearing]

[Double-row angular contact ball bearing]

[Matched pair angular contact ball bearing]

[Double/four-row and matched pair tapered roller bearing]

What is Bearing? (Beginner ～Intermediate )

Basic Idea to Select the Bearing (Intermediate ～ Advanced)

Case Studies

Table 10-4 Axial internal clearance of matched pair angular contact ball bearings (measurement clearance)^1）

What is Bearing?
(Beginner ～Intermediate )

Basic Idea to Select the Bearing
(Intermediate ～ Advanced)