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Journal Bearings - Selection

Operating conditions applicable to radial load ratings or babbitted and bronze bushed bearings, pillow blocks and take-ups of the rigid grease lubricated type.

Load ratings for Rigid Babbitted and Bronze Bearings apply ONLY if the following conditions are met:

  1. Adequate grease lubrication must be maintained.
  2. Proper bearing alignment for uniform distribution of load under all operating conditions must be provided and maintained.
  3. Normal running loads should not exceed ratings shown in the load tables.  Starting and occasional peak loads should not exceed ratings by more than 100%.
  4. Direction of load should not be closer than 30° to grease groove.  If bearing has a cap which is not gibbed or dowelled to base, load should be on base and should not be closer than 30° to joint between cap and base.
  5. The shaft journal surface finish must be equal to that of commercial steel shafting, (about 32 micro inches) and the diameter within the tolerances of commercial steel shafting.
  6. Ambient (surrounding) temperature should not exceed 130° F for babbitted and 300° F for bronze bushed bearings. If the shaft transmits heat from a source such as an oven, the shaft temperature at the bearing should not exceed the above ambient temperature.
  7. Bearings should be protected against adverse operating conditions. Note: If the aforementioned operating conditions cannot be met, apply a service factor depending on the specific application of up to 2.0 for areas in the rating table to the left of the zigzag line and of up to 3.0 for areas to the right....Ratings are for bearings having a length of approximately twice the diameter.

MPTA RADIAL LOAD RATINGS FOR RIGID BABBITTED SLEEVE BEARINGS STD. NO. 401

Shaft
Size

RPM

10

50

100

150

200

250

300

350

400

450

500

600

700

800

900

1000
1/2
5/8
3/4
7/8
15/16
100
150
180
260
280
100
150
175
255
275
100
145
175
250
265
95
145
170
245
260
95
140
170
240
255
95
140
165
235
250
95
135
160
230
245
95
135
160
225
240
90
135
155
220
235
90
130
155
215
225
90
130
150
210
220
85
125
145
200
210
85
120
140
190
200
85
115
130
180
185
80
110
125
150
105
80
110
120
----
----
1
1 1/8
1 3/16,  1 1/4
1 5/16,  1 3/8
1 7/16,  1 1/2
295
415
440
585
640
290
410
430
570
625
285
400
420
555
605
280
390
410
535
585
270
380
395
520
565
265
370
385
505
545
260
355
375
485
525
250
345
360
470
500
245
335
350
455
480
240
325
340
435
460
230
315
325
420
440
220
295
305
345
205
205
245
190
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
1 11/16,  1 3/4
1 15/16,  2
2 3/16,  2 1/4
2 7/16,  2 1/2
2 11/16,  2 3/4
875
1150
1460
1800
2190
850
1110
1400
1730
2080
820
1060
1330
1630
1950
785
1010
1260
1530
1820
755
965
1190
1430
1690
720
915
1120
1340
1560
690
865
1050
1240
1150
655
815
975
645
110
625
730
410
----
----
590
335
----
----
----
340
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
2 15/16,  3
3 7/16,  3 1/2
3 15/16,  4
4 7/16,  4 1/2
4 15/16,  5
2600
3550
4640
5870
7240
2470
3330
4310
5410
6600
2300
3060
3910
4830
5810
2130
2790
3500
4250
5010
1960
2520
2760
1410
----
1790
1200
----
----
----
675
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
5 7/16,  5 1/2
5 15/16,  6
8750
10410
7900
9300
6840
7910
4360
2390
For Speeds Lower Than 10 RPM Consult Factory.

MPTA RADIAL LOAD RATINGS FOR RIGID BRONZE SLEEVE BEARINGS STD. NO. 401

Shaft
Size

RPM

10

50

100

150

200

250

300

350

400

450

500

600

700

800

900

1000
5/8
3/4
7/8
15/16
250
300
435
465
250
300
430
460
245
295
425
455
245
295
420
450
245
290
415
445
240
285
410
435
240
285
405
430
235
280
400
425
235
280
395
420
235
275
390
415
230
270
385
410
225
265
375
395
220
260
365
385
220
255
355
375
215
250
325
295
210
240
245
200
1
1 1/8
1 3/16,  1 1/4
1 5/16,  1 3/8
1 7/16,  1 1/2
495
700
735
980
1070
490
690
730
965
1050
485
680
715
950
1030
480
670
705
930
1010
470
660
695
915
995
465
650
680
895
975
460
640
670
880
955
450
630
660
865
935
445
620
645
845
915
440
605
635
830
895
430
595
625
815
875
420
575
600
735
635
405
525
485
465
315
360
360
300
195
----
255
195
115
----
----
150
----
----
----
----
1 11/16,  1 3/4
1 15/16,   2
2 3/16,   2 1/4
2 7/16,  2 1/2
2 11/16,  2 3/4
1470
1920
2440
3020
3660
1440
1880
2390
2940
3560
1410
1830
2320
2850
3430
1370
1790
2240
2750
3300
1340
1740
2170
2650
3170
1310
1690
2100
2560
3040
1280
1640
2030
2460
2620
1240
1590
1960
1860
1580
1210
1500
1390
1090
545
1180
1110
830
----
----
930
715
265
----
----
410
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
2 15/16,  3
3 7/16,  3 1/2
3 15/16,  4
4 7/16,  4 1/2
4 15/16,  5
4370
5960
7790
9860
12180
4230
5740
7460
9400
11540
4060
5470
7060
8820
10740
3890
5200
6650
8240
9950
3720
4930
5910
5400
4090
3550
3610
----
----
----
2440
1440
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
5 7/16,  5 1/2
5 15/16,  6
14740
17530
13880
16420
12820
15040
10340
9520
For Speeds Lower Than 10 RPM Consult Factory.
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