ENGINIEERING INFO (BALLS)
Engineering Information of FYH Ball Bearings
Ball Bearing Life Calculations
The relationship between the basic rating life, the basic dynamic load rating, and the dynamic equivalent load of the ball bearing is indicated in Formula 1. If the ball bearing unit is being used at a fixed rotating speed, the life is indicated as time. This is shown in Formula 2.


L₁₀:Basic Rating Life 10⁶rotations
L₁₀h:Rated Life (hr)
Cr:Basic Dynamic Load Rating (lbf)
Pr:Dynamic equivalent Load (lbf)
n:Speed (min-¹)

Basic Loads(lbf)
SIZE Dynamic Load
Static Load
UC201 2880 1496
UC202 2880 1496
UC203 2880 1496
UC204 2880 1496
UC205 3150 1766
UC206 4388 2543
UC207 5783 3465
UC208 6548 4005
UC209 7673 4793
UC210 7898 5243
UC211 9765 6615
UC212 11790 8145
UC213 12870 9023
UC214 13995 9923
UC215 15165 10868
UC216 16358 11925
UC217 18900 13928
UC218 21623 16088
Basic Loads(lbf)
SIZE Dynamic Load Static Load
UCX05 4388 2543
UCX06 5783 3465
UCX07 6548 4005
UCX08 7673 4793
UCX09 7898 5243
UCX10 9765 6615
UCX11 11790 8145
UCX12 12870 9023
UCX13 13995 9923
UCX14 15165 10868
UCX15 16358 11925
UCX16 18900 13928
UCX17 21623 16088
UCX18 24525 18428
UCX20 29925 23625
Basic Loads(lbf)
SIZE Dynamic Load Static Load
UC305 4770 2453
UC306 6008 3375
UC307 7515 4343
UC308 9158 5400
UC309 11003 6638
UC310 13950 8618
UC311 16110 10125
UC312 18428 11745
UC313 20858 13478
UC314 23400 15345
UC315 25425 17370
UC316 27675 19508
UC317 29925 21780
UC318 32175 24075
UC319 34425 26775
UC320 38925 31725
UC321 41400 34425
UC322 46125 40500
UC324 46575 41625
UC326 51525 48150
UC328 56925 55350

Unit : min-1
Limiting Speed Ball Bearings
Bore
dia.code
UC type / UC-S6 type / UK type / NC type / NA type / ER type / RB type SA type
SB type
SU type
SU-S6 type
Standard type
Heat resistant type(D1K2)
Cold resistant type(D2K2)
Standard blowers type(S3)
Heat resistant(D9K2)
High-speed type(K3)
High-speed blowers(S5)
Diameter series Diameter series Diameter series Diameter series
2 X 3 2 X 3 2 0
8               10000
00 -     -     - 10000
01 5800     8700     6800 8000
02 5800     8700     6800 6600
03 5800     8700     6800 5800
04 5800 - - 8700 - - 5800 5000
05 5100 4300 4600 7700 6400 6700 5100 4000
06 4300 3700 3900 6400 5500 5800 4300 3300
07 3700 3300 3400 5500 5000 5100 3700 -
08 3300 3100 3100 5000 4600 4600 3300  
09 3100 2800 2700 4600 4300 4100 3100  
10 2800 2500 2400 4300 3800 3700 2800  
11 2500 2300 2300 3800 3500 3400    
12 2300 2200 2100 3500 3200 3100    
13 2200 2100 1900 3200 3100 2900    
14 2100 2000 1800 3100 2900 2700    
15 2000 1800 1700 2900 2700 2600    
16 1800 1700 1600 2700 2600 2400    
17 1700 1600 1500 2600 2400 2300    
18 1600 1500 1400 2400 2300 2100    
19 - - 1400 - - 2000    
20   1300 1300   2000 1900    
21   - 1200   - 1800    
22     1100     1700    
24     1100     1600    
26     1000     1500    
28     910     1400    


Type of ball
bearing units

Fitting factor fc (recommended)

Shaft tolerance range class
h5 , j5 j6 h6 h7 h8 h9
With set screws
Standard type
L3 type

-
-

1
-

1
-

0.8
1

0.5
1

0.2
0.9
Heat resistant type
(Special code : D1K2)

Cold resistant type (Special code : D2K2)

-


-

-


-

-


-

1


1

1


1

0.7


0.7
For high speed
(Special code : K3)

For blower
(special code : S3 or S5)

-


1

1


-

0.8


0.8

0.6


0.6

-


-

-


-
With adapters - - - - 1 1
With eccentric locking collar 1 - - - - -


Unit : lbf
Allowable Radial Load (lbf) at Various RPM
SHAFT SIZE SIZE L10h RPM (min-1)
50 100 150 300 500 750 1000 1500 2000 2500 3000
1/2" 12 mm UC201 10000 926.8 735.6 642.6 510 430.2 375.8 341.4 298.2 271 251.5 236.7
25000 682.9 542 473.5 375.8 316.9 276.9 251.5 219.7 199.6 185.3 174.4
50000 542 430.2 375.8 298.2 251.5 219.7 199.6 174.4 158.4 147.1 138.4
70000 484.5 384.5 335.9 266.6 224.8 196.4 178.5 155.9 141.6 131.5 123.7
100000 430.2 341.4 298.2 236.7 199.6 174.4 158.4 138.4 125.7 116.7 109.8
5/8" 15 mm UC202 10000 926.8 735.6 642.6 510 430.2 375.8 341.4 298.2 271 251.5 236.7
25000 682.9 542 473.5 375.8 316.9 276.9 251.5 219.7 199.6 185.3 174.4
50000 542 430.2 375.8 298.2 251.5 219.7 199.6 174.4 158.4 147.1 138.4
70000 484.5 384.5 335.9 266.6 224.8 196.4 178.5 155.9 141.6 131.5 123.7
100000 430.2 341.4 298.2 236.7 199.6 174.4 158.4 138.4 125.7 116.7 109.8
      17 mm UC203 10000 926.8 735.6 642.6 510 430.2 375.8 341.4 298.2 271 251.5 236.7
25000 682.9 542 473.5 375.8 316.9 276.9 251.5 219.7 199.6 185.3 174.4
50000 542 430.2 375.8 298.2 251.5 219.7 199.6 174.4 158.4 147.1 138.4
70000 484.5 384.5 335.9 266.6 224.8 196.4 178.5 155.9 141.6 131.5 123.7
100000 430.2 341.4 298.2 236.7 199.6 174.4 158.4 138.4 125.7 116.7 109.8
3/4" 20 mm UC204 10000 926.8 735.6 642.6 510 430.2 375.8 341.4 298.2 271 251.5 236.7
25000 682.9 542 473.5 375.8 316.9 276.9 251.5 219.7 199.6 185.3 174.4
50000 542 430.2 375.8 298.2 251.5 219.7 199.6 174.4 158.4 147.1 138.4
70000 484.5 384.5 335.9 266.6 224.8 196.4 178.5 155.9 141.6 131.5 123.7
100000 430.2 341.4 298.2 236.7 199.6 174.4 158.4 138.4 125.7 116.7 109.8
7/8"
15/16"
1"
25 mm UC205 10000 1013.7 804.6 702.9 557.8 470.5 411 373.4 326.2 296.4 275.1 258.9
25000 746.9 592.8 517.9 411 346.7 302.8 275.1 240.3 218.4 202.7 190.7
50000 592.8 470.5 411 326.2 275.1 240.3 218.4 190.7 173.3 160.9 151.4
70000 529.9 420.6 367.4 291.6 245.9 214.8 195.2 170.5 154.9 143.8 135.3
100000 470.5 373.4 326.2 258.9 218.4 190.7 173.3 151.4 137.5 127.7 120.1

If the bearing with set screws is exposed to a heavy load (Pr / Cr > 0.12), vibration,
or heavy inpact,use a tighter shaft tolerance than nomal


LINK : allowable Radial load


Normal Duty Medium Duty Heavy Duty