SKF Cooper split
spherical roller bearings

Reduce MTTR for increased productivity – and improve worker safety

Cut downtime
to a minimum
For customers looking for bearings designed to be easily replaced in situ with little disturbanceto the shaft alignment or driveline, SKF Cooper split spherical roller bearings offer a solution– reducing mean time to repair (MTTR) by 70%.
• Allows safer and time-saving in situ bearing replacements inthe trapped position on conveyor pulleys, stacker reclaimers
and other machinery• Sealed variant available for increased protection against
contamination and reduced maintenance• Longer service life (MTBF) compared to other split bearings,
thanks to the wire cut inner and outer ring manufacturing
technique and sealed versions• Sealed variant reduces grease consumption – and cuts
environmental impact• Compatible with SKF metric and inch split block housings e.g.
SNLD, SMS and SAF / SDAF
• Reduced risk of shaft fretting with better axial clamping• Interchangeable with competitors’ split spherical roller
bearings and split block housings

MTTR:
From 24 hours
to 8 hours** In-field reports of bearing changes
for mining customers2Decrease your:
MTTRWorker
exposure toaccidents

Increase your:
Productivity

Bearingreliability

Contaminantingress

Machineperformance

Cost savings

3

Taking on yourbiggest challenge
Tough enough forheavy-duty industries• Mining• Mineral processing• Cement

And a wide range
of applications• Conveyor pulleys• Rope sheaves• Bucket elevators• Stackers/reclaimers• Hoists and winches• Horizontal grinding mill pinions• Mixers and agitators• Jack shafts• FansBoost worker safety
43% of accidents in the mining andcement industry occur while workers perform maintenance or checks
on conveyors. With the SKF Cooper
split spherical roller bearings there
is no need to dismount the drive
coupling or the cantilevered drive toreplace the bearing thus avoiding
realignment. This greatly reduces
the safety risk to workers.

Meet yourrequirements
SKF Cooper split spherical roller bearings are manufactured to ISO Normal precision andrunning accuracy. The mounted internal radial clearance of the split bearing is slightly moreor less than the mounted clearance of a standard (CN) spherical roller bearing mounted on an
adapter sleeve. Other bearing internal clearances (e.g. C3) are available upon request.
The SKF Cooper split spherical roller bearing can be used with SKF metric and inch split blockhousings. The split bearing outer shroud is the same dimension as a standard ISO sphericalbearing outer ring.

Minimum load
The requisite minimum load to be
applied to spherical roller bearings canbe estimated using Pm = 0,01 C0 where:• Pm = Equivalent minimum load, kN• C0 = basic static load rating, kN

Shaft and housing fitting• Shaft ISO h9 (IT5/2 and surface
roughness, Ra = 0,8)
• Housing ISO G7 (IT6/2)

Grease lubrication (greaseordered separately)
Fill the bearing with one of the following
recommended SKF greases at assembly:
Ambient conditions• Normal		

LGEP 2• High temperatures(to +120 °C (+248 °F))

LGHB 2• Cold temperatures(to –30 °C (–22 °F))

LGWM 2

Alternative Lithium/Lithium Complex
NLGI 2 greases with suitable base oil
viscosity can be used.

Oil lubrication

The bearing should be relubricatedwith grease through its W33 grooveaccording to the following formula:
Gp = 0,0015 x D x B for sealed bearings
where:Temperature limits• Gp = grease quantity, grams• D = bearing outside diameter, mm• B = bearing outer ring width, mm
The frequency of the relubrication
should be according to the General
Catalogue and based on the bearing size,
shaft speed, operating temperature, etc.
SKF SYSTEM24 lubricators with SKF
LGWA 2 grease can be used to relubricate
the bearings.

Use ISO VG 220 oil or ISO VG 320 oil
as required.
Bearing components are heat stable
up to 120 °C at continuous operation.
The seals have a limit of –40 to +90 °C(–40 °F to +194 °F). Check that thebearing is adequately lubricated fornormal operating conditions.

Bearing rating life
SKF Cooper uses ISO 281:2007 tocalculate the L10m modified rating life of
the split spherical roller bearing. The
sealed split bearing will have minimum
two times longer rating life than theopen (unsealed) bearings because of the
improved exclusion of contamination.

5Bearing equivalent load, Pr

Permissible axial load

The bearing equivalent dynamic load
is calculated the same as a standard(non-split) spherical roller bearing witha dynamic factor, fd. See table.

Owing to the steel inner ring clamp ring
design, the SKF Cooper split sphericalroller bearings have 50–100% higher
permissible axial shaft clamp load capability compared to competitor’s bearings.

aISO

Dynamic factor

50,0

The appropriate dynamic factor (fd) may be takenfrom the chart.
Conditions
Steady load or small fluctuationsfd
1.0 –1.3

Light shock

1.3 – 2.3

Heavy shock, vibration or reciprocation

2.0 – 3.5

20,0

10,05,02,01,05Consult SKF Applications Engineeringfor assistance.

0,1000000
60n1

1030,8CrPr

0,6L10mh =aISO

The split spherical roller bearing has apermissible angular misalignment
between the inner and outer ring of 2°
for bearings with shaft diameter lessthan 280 mm and 3° for bearings with
280 mm shaft diameter and larger.
Sealed bearings have a permissible
misalignment of ± 0.5°. This is the same
permissible misalignment as the SKF TK
taconite seal mounted in the SKF split
block housings.

4The modified rating life is calculated thesame as a standard spherical bearing
using the following:

Misalignment

k=ISO modified rating life, L10mh2• Pr = fd ( X Fr + Y Fa)

40,0,50,30,20,20,150,10,10,05
0,005

0,01

0,02

0,05

0,10,20,5

1,0

2,05,0Cu
ec –––
PLife modification factor, aISO for radial roller bearings based on ISO 281

6KbInstallation

Mount the split spherical bearing according to the instructions provided with thepackaging. Safety is very important.
Read all installation instructions carefully before starting work.
D D1 D2

Follow all warnings and precautions
and wear proper PPE as required. The
requisite minimum tightening torques
for the screws are provided in the tables.

d d2

BC

Principal dimensions
dDB

Dimensions
Cd2

D1

Basic load ratings Fatigue
Speed ratingload limit Limiting speed
dynamic static
D2b

K

Cr

Co

Cu

sealedDesignations
open
sealedunsealed

Shaft diameter
mmmm

kN

r/min–

240
260
280

440
460
500

144
146
160

200
200
220

277
300
321

386
421
446

365
396
422

16
1616999

1 675
2 120
2 140

2 885
3 705
3 805

246307311

170
155
145

510
455
455

231S240M
231S260M
231S280M

231S240M-2SRS
231S260M-2SRS
231S280M-2SRS

300
320
340

540
580
600

176
190
192

230
254
262

346
370
394

482
522
553

452
482
508

2222
22912
122 604
3 041
3 582

4 670
5 530
6 560

372
432
502

135
125
120

410
385
340

231S300M
231S320M
231S340M

231S300M-2SRS
231S320M-2SRS
231S340M-2SRS

360
380
400

620
650
700

194
200
224

262
274
292

415
435
455

576
592
632

534
552
575

222222121212

3 638
3 546
3 790

6 710
6 555
7 075

506
489521

115
105
105

340
340
320

231S360M
231S380M
231S400M

231S360M-2SRS
231S380M-2SRS
231S400M-2SRS

410
430
450

720760
790

226
240
248

292
306
310

455
484
508

632
682
700

575
628
643

222222121212

3 790
4 791
4 853

7 075
8 990
9 260

521
648
659

105
95
90

320
295
290

231S410M
231S430M
231S450M

231S410M-2SRS
231S430M-2SRS
231S450M-2SRS

Calculation factors
e

Y1

Y2

Y0

–

Mass

Designations
open
sealedkg–

0,30,31
0,32,32,1
2,33,43,3
3,42,22,22,2120
131
171

231S240M
231S260M
231S280M

231S240M-2SRS
231S260M-2SRS
231S280M-2SRS

0,30,310,312,32,22,23,43,33,32,22,22,2212
272293

231S300M
231S320M
231S340M

231S300M-2SRS
231S320M-2SRS
231S340M-2SRS

0,30,30,28

2,32,32,43,43,43,62,22,22,5308344438

231S360M
231S380M
231S400M

231S360M-2SRS
231S380M-2SRS
231S400M-2SRS

0,280,30,32,42,32,33,63,43,42,52,22,2464564613

231S410M
231S430M
231S450M

231S410M-2SRS
231S430M-2SRS
231S450M-2SRS

Consult SKF for availability of inch dimension
bearings and other series and sizes

7skf.com® SKF, Cooper and SKF SYSTEM24 are registered trademarks of the SKF Group.
© SKF Group 2019
The contents of this publication are the copyright of the publisher and may not be reproduced (evenextracts) unless prior written permission is granted. Every care has been taken to ensure the accuracyof the information contained in this publication but no liability can be accepted for any loss or damage
whether direct, indirect or consequential arising out of the use of the information contained herein.
PUB 73/P2 18333 EN · March 2019

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