# Operating clearance

Table 10-1 shows how to determine the operating clearance when the shaft and housing are made of steel.
『Table 10-1 How to determine operating clearance』
Tables 10-2 to 10-10 show standard values for bearing internal clearance before mounting.
『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)』
『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』
『Table 10-8 Radial internal clearance of cylindrical roller bearings and machined ring needle roller bearings』
『Table 10-9 Radial internal clearance of spherical roller bearings』
『Table 10-10 Radial internal clearance of double/four-row and matched pair tapered roller bearings (cylindrical bore)』
Table 10-11 shows examples of clearance selection excluding CN clearance.
『Table 10-11 Examples of non-standard clearance selection』

## Table 10-1 How to determine operating clearance

Operating clearance（S） Decrease of clearance due to fitting（Sf） S＝So－（Sf＋St1＋St2）＋Sw※※Sw (increase of clearance due to load) is generally small, and thus may be ignored, although there is an equation for determining the value. 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 :St1＝α（Di・ti－De・te） where :De＝Di＋2Dw Consequently,St1＋St2will be determined by the following equation : St1＋St2＝α・Di・t1＋2α・Dw・t2 （Temperature differential between the inner and outer rings, t1, can be expressed as follows :t1＝ti－te Temperature differential between the rolling element and outer ring, t2, can be expressed as follows : t2＝tw－te） St2＝2α・Dw・tw

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
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]

1. 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.
2. Values in Italics are prescribed in JTEKT standards.
Nominal bore diameter
d，mm
N
Amounts of clearance correction, µm
over up to 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
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°
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
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
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
CM
over up to min. max.
101） 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
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
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
C 9 NA1） 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
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
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
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
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

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

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

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