Idlers 2017-07-19T14:51:49+00:00

Idlers

Current: Steel Rollers
HDPE Roller
Impact & Rubber Disk Rollers
Aluminium Roller
Idler Ratings

Idlers (Steel Rollers) for conveyors

 

The revolutionary centrifugal self-cleaning action of the seals ensure that bearings are able to reach their designed life. Grease-free sealing elements result in much lower friction values than conventional designs.

Have a look at the range below:

SERIES
DIAMETER
(mm)
SHELL WALL
(mm)
NOMINAL SHAFT
DIAMETER (mm)
BEARING PART NO.
BRG.DYNAMIC
RATING (N)
20
89
3
20
6204 – 2RS
12 700
102
3.5
114
3.5
127
3.8
25
102
3.5
25
6205 – 2RS
14 000
114
3.5
127
3.8
133
4
139
4
152
4
159
4
27
127
3.8
25
6305 – 2RS
22 500
133
4
139
4
152
4
159
4

32
127
3.8
30
6306 – 2RS
28 100
133
4
139
4
152
4
159
4
178
4
35
152
6
35
6307 – 2RS
33 200
159
6
178
6
40
152
6
40
6308 – 2RS
41 000
159
6
178
6
193
6
219
6
45
152
6
45
6309 – 2RS
52 700
159
6
178
6
193
6
50
178
6
50
6310 – 2RS
61 800
193
6
60
193
6
60
6312 – 2RS
81 900
219
6

 

Shell wall thickness for CEMA idlers and rollers sized to meet CEMA guidelines for rotating mass and WK2 values.

SERIES
DIAMETER
(mm)
SHELL WALL
(mm)
NOMINAL SHAFTDIAMETER (mm)  
BEARING PART NO.
BRG.DYNAMICRATING (N) 
20
89
3
20
6204 – 2RS
12 700
102
3.5
114
3.5
127
3.8
25
102
3.5
25
6205 – 2RS
14 000
114
3.5
127
3.8
133
4
139
4
152
4
159
4
27
127
3.8
25
6305 – 2RS
22 500
133
4
139
4
152
4
159
4
32
152
4
30
6306 – 2RS
28 100
159
4
178
4
35
152
6
35
6307 – 2RS
33 200
159
6
178
6
40
152
6
40
6308 – 2RS
41 000
159
6
178
6
193
6
219
6
45
178
6
45
6309 – 2RS
52 700
193
6

 

Shell wall thickness for CEMA idlers and rollers sized to meet CEMA guidelines for rotating mass and WK2 values.

SERIES
DIAMETER
(mm)
SHELL WALL
(mm)
NOMINAL SHAFTDIAMETER (mm) 
BEARING PART NO.
BRG.DYNAMICRATING (N) 
20
89
3
20
6204 – 2RS
12 700
102
3.5
114
3.5
127
3.8
25
102
3.5
25
6205 – 2RS
14 000
114
3.5
127
3.8
133
4
139
4
152
4
159
4
27
127
3.8
25
6305 – 2RS
22 500
133
4
139
4
152
4
159
4
32
152
4
30
6306 – 2RS
28 100
159
4
178
4
35
152
6
35
6307 – 2RS
33 200
159
6
178
6
40
152
6
40
6308 – 2RS
41 000
159
6
178
6
193
6
219
6
45
178
6
45
6309 – 2RS
52 700
193
6

 

Shell wall thickness for CEMA idlers and rollers sized to meet CEMA guidelines for rotating mass and WK2 values.

SERIES
DIAMETER
(mm)
SHELL WALL
(mm)
NOMINAL SHAFTDIAMETER (mm)
BEARING PART NO.
BRG.DYNAMICRATING (N)
SABS 25
127
3.8
25
6205 – 2RS
14 000
152
4
SABS 30
152
178
4
4
30
6306 – 2RS
28 100
SABS 35
152
6
35
6307 – 2RS
33 200
178
6
SABS 40
152
6
40
6308 – 2RS
41 000
178
6
SERIES
DIAMETER
(mm)
SHELL WALL
(mm)
NOMINAL SHAFTDIAMETER (mm)
BEARING PART NO.
BRG.DYNAMICRATING (N)
SABS 25
127
3.8
25
6205 – 2RS
14 000
152
4
SABS 30
152
4
30
6306 – 2RS
28 100 N
SERIES
DIAMETER
(mm)
SHELL WALL
(mm)
NOMINAL SHAFT
DIAMETER (mm)
BEARING PART NO.
BRG.DYNAMIC
RATING (N)
SABS 25
127
3.8
25
6205 – 2RS
14 000
152
4
SABS 30
152
4
30
6306 – 2RS
28 100 N
Bearings: Deep groove double sealed or shielded bearings of tolerance class C3 and C4 are used. This allows for a larger amount of angular misalignment at the bearing than other bearing designs and classes.Steel Tube: Only high quality tube specially manufactured for idlers for converyors is used and conforms to SABS 657/3 (1980). Shell ends are machined to prevent belt wear.Steel Shaft: Manufactured from steel which complies with the requirements for grade 070 M20 of BS 970-1. The shaft diameter tolerance is as recommended by bearing manufacturers and ensures a js6 fit. Shaft end slots are machined to customer standards.Hollow Shaft: Stepped light weight hollow steel shafts equivalent in strength and rigidity to solid shafts are available on request.Bearing Housing: Manufactured from deep drawing material KHR1. Housings are pressed and MIG-welded to the inside of the tube.Corrosion Protection: External coat of self Etch primer unless otherwise specified.Circular Movement Tolerance (TIR): TIR does not exceed 0,5 mm measured at a distance of 25 mm from the roller end face. Actual TIR values are less and can be verified by reference to historical data.

Roller Face Length (mm)
TIR
D<=127 D>127
Up to 536 0,5 0,6
586 to 965 0,7 0,9
994 to 1 450 1,3 1,6
1 602 to 2 518 1,9 2,3
Lorbrand Idlers for conveyors have frictionless seals.Idler drag is due to bearings only and is therefore easy to predict. Drag is dependent on factors such as loading, rpm, bearing type, characteristics and temperature.
Consult Lorbrand for friction values.
Lorbrand is able to test rollers according to CEMA (Edition 6, Appendix F) “Kis” test procedure and also actual friction values under various load and ambient temperature conditions. Tests can be performed on actual bearings supplied on a particular project.
Typical friction values for 3 roll carry idlers at rated load running at 500 rpm are listed below.

BW
BW
3 Roll Carry Idler Running Friction (N)
in
mm
CEMA B 6204
CEMA C 6205
   
rated load

3 rolls


3 rolls


rated load


3 rolls


3 rolls

   
kg


102 DIA


127 DIA


kg


102 DIA


127 DIA

400
 
 
 
18
450
186
2.3
1.9
409
3.5
3.0
20
500
186
2.3
1.9
409
3.5
3.0
24
600
186
2.3
1.9
409
3.5
3.0
30
750
186
2.3
1.9
409
3.5
3.0
36
900
186
2.3
1.9
380
3.4
2.8
1000
175
2.3
1.8
370
3.3
2.8
42
1050
165
2.2
1.8
360
3.2
2.7
48
1200
160
2.2
1.8
338
3.1
2.6
54
1350
 
317
3.0
2.5
1400
 
310
2.9
2.4
60
1500
 
 
295
2.8
2.4

 

BW
BW
3 Roll Carry Idler Running Friction (N)

in

mm
SERIES 27 6305
SERIES 30 6206
 
rated load


3 rolls


3 rolls


rated load


3 rolls


3 rolls

 
kg


127 DIA


152 DIA


kg


127 DIA


152 DIA

400
18
450
409
3.8
3.2
20
500
409
3.8
3.2
24
600
409
3.8
3.2
464
4.7
4.0
30
750
409
3.8
3.2
464
4.7
4.0
36
900
380
3.7
3.1
464
4.7
4.0
1000
370
3.6
3.0
464
4.7
4.0
42
1050
360
3.5
3.0
464
4.7
4.0
48
1200
338
3.4
2.9
464
4.7
4.0
54
1350
317
3.3
2.8
391
4.2
3.5
1400
310
3.2
2.7
385
4.2
3.5
60
1500
295
3.2
2.7
375
4.1
3.4
1600
365
4.0
3.4
72
1800
343
3.9
3.2

 

BW
BW
3 Roll Carry Idler Running Friction (N)

in

mm
CEMA D 6306
SERIES 35 6307
   
rated load


3 rolls


3 rolls


rated load


3 rolls


3 rolls

   
kg


152 DIA


178 DIA


kg


152 DIA


178 DIA

24
600
545
4.7
4.0
30
750
545
4.7
4.0
36
900
545
4.7
4.0
818
7.4
6.3
1000
545
4.7
4.0
818
7.4
6.3
42
1050
545
4.7
4.0
818
7.4
6.3
48
1200
545
4.7
4.0
818
7.4
6.3
54
1350
507
4.5
3.9
818
7.4
6.3
1400
500
4.5
3.8
818
7.4
6.3
60
1500
486
4.4
3.7
818
7.4
6.3
1600
472
4.3
3.7
818
7.4
6.3
72
1800
444
4.1
3.5
818
7.4
6.3
2000
780
7.1
6.1
84
2100
761
7.0
6.0
96
2400
740
6.8
5.8

 

BW
BW
3 Roll Carry Idler Running Friction (N)

in

mm
CEMA E 6308
SERIES 45 6309
   
rated load


3 rolls


3 rolls


rated load


3 rolls


3 rolls

   
kg


152 DIA


178 DIA


kg


152 DIA


178 DIA

36
900
818
8.6
7.3
1000
818
8.6
7.3
42
1050
818
8.6
7.3
48
1200
818
8.6
7.3
54
1350
818
8.6
7.3
1400
818
8.6
7.3
60
1500
818
8.6
7.3
1250
13.6
11.6
1600
818
8.6
7.3
1250
13.6
11.6
72
1800
818
8.6
7.3
1250
13.6
11.6
2000
780
8.3
7.1
1250
13.6
11.6
84
2100
761
8.2
7.0
1250
13.6
11.6
96
2400
740
8.0
6.8
1150
12.7
10.9

 

BW
BW
3 Roll Carry Idler Running Friction (N)

in

mm
CEMA F 6310
SERIES 60 6312
   
rated load


3 rolls


3 rolls


rated load


3 rolls

   
kg


178 DIA


219 DIA


kg


219 DIA

60
1500
1364
14.0
11.4
1600
1364
14.0
11.4
72
1800
1364
14.0
11.4
1600
16.1
2000
1364
14.0
11.4
1600
16.1
84
2100
1364
14.0
11.4
1600
16.1
96
2400
1273
13.3
10.8
1600
16.1
108
2500
1600
16.1
2600
1600
16.1
2800
1600
16.1
3000
1600
16.1
Primary Sealing
The success of the primary sealing area lies in the fact that dirt which enters is ALLOWED TO ESCAPE. The metal seal collects dirt and flings it radially outward due to centrifugal force (3-9 times gravitational).

Secondary Sealing
Dirt which enters secondary sealing area is again propelled outwards by centrifugal force. All sealing surfaces are clean and free from contact and do not require packing with grease. The sealing arrangement is so designed that water drains out of the seal when the idler is stationary.Most secondary seals on the market are of the labyrinth type and centrifugal force actually helps keep dirt in the sealing area where it can work its way back to the bearing.

Bearing Sealing
Greased for life bearings complete with seals on both sides are used. The bearing seals form the final barrier against dirt ingress, especially rust particles which are formed due to condensation inside the shell tube.


Standard Lorbrand idler rolls used in Shotblast Booth still turning
freely after 1 year operation
Steel Rollers
HDPE Roller
Current: Impact & Rubber Disk Rollers
Aluminium Roller
Idler Ratings

Idlers (Impact & Rubber Disc Rollers)

 

Impact and rubber disc rolls consist of steel reinforced rubber impact discs press fitted onto a conventional steel roller body. Each rubber disc is positively located and there is no possibility of rubbers moving due to impact loads. Spacers and end-stops are not required.Apart from the rubber discs, the same components and seals are used for the steel rollers.

Have a look at the range below:

SERIES
DIAMETER
NOMINAL SHAFT
DIAMETER (mm)
BEARING PART NO.
BRG.DYNAMIC
RATING (N)
(in)
(mm)
25
5
127
25
6205 – 2RS
14 000
5 ¼
133
6
152
6 ¼
159
27
5
127
25
6305 – 2RS
22 500
5 ¼
133
6
152
6 ¼
159
32
6
152
30
6306 – 2RS
28 100
7
178
35
7
178
35
6307 – 2RS
33 200
8
203
40
7
178
40
6308 – 2RS
41 000
8
203
45
8
203
45
6309 – 2RS
52 700
50
8
203
50
6310 – 2RS
61 800
60
10
250
60
6312 – 2RS
81 900
SERIES
DIAMETER
(mm)
NOMINAL SHAFT DIAMETER (mm)
BEARING PART NO.
BRG.DYNAMIC RATING (N)
25
127
25
6205 – 2RS
14 000
133
152
159
27
127
25
6305 – 2RS
22 500
133
152
159
32
152
30
6306 – 2RS
28 100
178
35
178
35
6307 – 2RS
33 200
203
40
178
40
6308 – 2RS
41 000
203
45
203
45
6309 – 2RS
52 700
50
203
50
6310 – 2RS
61 800
60
250
60
6312 – 2RS
81 900

 

SERIES
DIAMETER
(mm)
NOMINAL SHAFT DIAMETER (mm)
BEARING PART NO.
BRG.DYNAMIC RATING (N)
SABS 25
127
25
6205 – 2RS
14 000
133
152
159
SABS 30
152
30
6306 – 2RS
28 100 N
159
SABS 30
178
30
6306 – 2RS
28 100
SABS 40
178
40
6308 – 2RS
41 000
Steel Rollers
HDPE Roller
Impact & Rubber Disk Rollers
Aluminium Roller
Current: Idler Ratings

Idlers (Idler Ratings)

CEMA Load Ratings for 3 Roll Carry & Impact Idlers (kg)

BW
CEMA B
CEMA C
 
CEMA D
CEMA E
 
CEMA F
in
mm
SER 20
SER 25/27
SER 30
SER 32
SER 35/40
SER 45
SER 50
SER 60
 
400
 
 
 
18
450
186
409
 
 
 
 
 
20
500
186
409
 
 
 
 
24
600
186
409
464
545
 
 
30
750
186
409
464
545
 
 
 
36
900
186
380
464
545
818
 
 
 
1000
158
353
464
545
818
 
 
42
1050
165
360
464
545
818
 
48
1200
160
338
464
545
818
 
 
54
1350
 
317
391
507
818
 
 
1400
 
310
385
500
818
 
60
1500
295
375
486
818
1250
1364
 
1600
 
365
472
818
1250
1364
 
72
1800
 
343
444
818
1250
1364
1600
 
2000
 
 
 
780
1250
1364
1600
84
2100
  
 
761
1250
1364
1600
96
2400
 
740
1150
1273
1600
108
2500
 
 
 
 
1600
 
2600
 
 
 
 
 
 
1600
2800
 
 
 
 
 
1600
 
3000
1600

CEMA Load Ratings for 2 Roll Vee Return Idlers (kg)

BW
CEMA C
 
CEMA D
CEMA E
 
 
 
in
mm
SER 25
SER 27
SER 30
SER 32
SER 35
SER 40
SER 45
400
18
450
20
500
24
600
227
227
30
750
227
227
36
900
227
227
386
591
591
1000
227
227
386
591
591
42
1050
227
227
386
591
591
48
1200
227
227
386
591
591
750
750
54
1350
227
227
386
591
591
750
750
1400
227
227
386
591
591
750
750
60
1500
227
227
386
591
591
750
750
1600
386
591
591
750
750
72
1800
386
591
591
750
750
2000
591
591
750
750
84
2100
591
591
750
750
96
2400
591
591
750
750

CEMA Load Ratings for Flat Return Idlers (kg)

BW
CEMA B
CEMA C
CEMA D
CEMA E
CEMA F
in
mm
SER 20
SER 25/27
SER 30
SER 32
SER 40/45

 
400
 
 
18
450
100
216
 
 
20
500
 
24
600
86
148
273
 
30
750
75
114
273
 
36
900
70
91
273
455
 
 
1000
 
 
 
42
1050
64
68
227
455
 
48
1200
59
57
193
455
54
1350
170
420
 
 
1400
 
 
 
 
60
1500
127
386
682
 
1600
 
 
 
72
1800
 
70
318
545

Load Ratings (kg) for SABS 3 Roll Carry & Impact Idlers

BW (mm)
SABS SER25
SABS SER30
SABS SER35
SABS SER40
400
 
 
450
409
 
 
500
409
 
600
409
464
 
750
409
464
 
900
380
464
818
818
1050
360
464
818
818
1200
328
464
818
818
1350
233
391
818
818
1500
217
375
818
818
1650
359
818
818
1800
 
343
818
818
2000
741
741
2100
 
761
761
2400
 
740
740


Load Ratings (kg) for SABS 5 Roll Carry & Impact Idlers

BW (mm)
SABS SER25
SABS SER30
BRG
6205
6206
1050
545
818
1200
545
818
1350
507
818
1500
486
818
1650
465
818
1800
444
818
2000
391
782
2100
380
761
2400
371
740


Load Ratings (kg) for SABS 2 Roll Vee Return Idlers

BW (mm)
SABS SER25
SABS SER30
600
227
 
750
227
 
900
227
386
1050
227
386
1200
227
386
1350
200
386
1500
153
350
1650
135
270
1800
125
240
2000
 
220
2100
 
200
2400
 
175


Load Ratings (kg) for SABS Flat Return Idlers

BW (mm)
SABS SER25
SABS SER30
450
216
 
500
193
 
600
148
750
114
150
900
91
145
1050
68
123
1200
54
105
1350
48
93
1500
43
86
1650
39
77
1800
36
70
Steel Rollers
Current: HDPE Roller
Impact & Rubber Disk Rollers
Aluminium Roller
Idler Ratings

Idlers (HDPE Roller)

Lorbrand HDPE rollers are the toughest around. Combining the strength of a proven standard welded steel body with the non-stick properties of an HDPE sleeve.

HDPE tube is interference fit over steel tube and machined to 0.15mm T.I.R. Rollers are ideally suited for low noise applications and as scale idlers.Features

  • Extremely low noise. Take care when walking next to the belt, chances are its running!
  • Fine tolerances – 0.15 mm T.I.R.
  • Corrosion resistant.
  • Non-stick properties.
  • Same strength as steel construction and are available up to CEMA F load rating.
Steel Rollers
HDPE Roller
Impact & Rubber Disk Rollers
Current: Aluminium Roller
Idler Ratings

Idlers (Aluminium Roller)

Aluminum rollers are lightweight and quieter than steel and are thus becoming more and more of a requirement on installations with strict OH&S codes.Large belt width installations such as coal loading terminals where there are aerial walkways increasingly use aluminum rolls.The corrosion resistance of aluminum rolls is a huge advantage at coastal or high humidity locations.Features

  • Light weight – OH&S
  • Quieter than steel – OH&S
  • High tensile strength alloys, no fatigue type failures.
  • Fine tolerance. Better T.I.R. than steel.
  • Corrosion resistance
  • Uses less energy (Power Consumption)
  • All aluminum tube flair tested.
  • Can be used in underground applications – depends on local regulations.
CEMA Idlers Catalogue
SABS Idlers Catalogue