RUBBER SHAFT BEARINGS

RUBBER SHAFT BEARINGS


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 The external housing of the ERMAKSAN rubber shaft bearings are made of bronze, sitel pipe, GRP (glass rein forced polyester) and internal sections are made of rubber. They are easy to install and remove. Because the rubber bearing is water cooled and water lubricated, they shoul generally be used in water. The ERMAKSAN rubber shaft bearings eliminate the noise and vibrations caused by the revolution of the prooeller and have a longer life than the other bearings.
 The internal rubber parts are resistent against heat, friction, sea water, oil, diesel fuel and chemicals. 
 

   

                                                        ® Brand registration and image

                                                                             ERMAKSAN TUZLA / IST
​

 


 

SHAFT DIAMETER MM BY SIZE

  

SHAFT BY INCH DIAMETER SIZE
D
mm		 D1 L
mm inch mm
20 32 1 1/4" 31,75 80
22 35 1 3/8" 34,92 88
25 40 1 1/2" 38,10 100
28 42 1 5/8" 41,27 112
30 45 1 3/4" 44,45 120
32 45 1 3/4 44,45 128
35 48 1 7/8" 47,62 140
38 50 2" 50,80 152
38 55 2 1/8" 53,97 152
40 55 2 1/8" 53,97 160
45 60 2 3/8" 60,32 178
45 65  2 1/2" 63,50 178
50 70 2 5/8" 66,67 200
55 75 3" 76,20 220
60 80 3 1/4" 82,55 240
65 85 3 1/2" 88,90 260
70 90 3 1/2" 88,90 280
70 95 3 3/4" 95,25 280
75 95 3 3/4" 95,25 300
75 100 4" 101,60 300
80 100 4" 101,60 320
85 105 4 1/8" 104,77 340
85 110 4 1/4" 107,95 340
90 110 4 1/2" 114,30 360
95 115 4 1/2" 114,30 380
98 125 5" 127,00 400
100 125 5" 127,00 400
100 130 5 3/8" 136,52 400
105 130 5 1/4" 133,35 420
108 135 5 1/2" 139,70 440
110 135 5 3/8" 136,52 440
110 140 5 1/2" 139,70 440
115 145 5 1/2" 139,70 460
118 156 6 1/8" 155,57 480
120 156 6" 152,40 480
125 165 6 1/2" 165,10 500
130 170 6 5/8" 168,27 520
130 180 6 5/8" 168,27 520
135 170 6 5/8" 168,27 522
135 180 6 5/8" 168,27 522
140 180 7" 177,80 560
145 180 7" 177,80 562
150 190 7 1/2" 190,50 600
155 190 7 1/2" 190,50 600
160 200 8" 203,20 602
165 210 8 3/8" 212,72 602-660
170 220 8 3/4" 222,25 602
170 220 8 3/4" 222,25 680
175 230 9" 228,60 602
180 230 9" 228,60 602
180 230 9" 228,60 720
185 230 9" 228,60 602
190 240 9 1/2" 241,30 602
195 250 9 7/8" 250,80 724
195 255 10" 254,00 724
200 260 10 1/4" 260,35 748
205 260 10 1/4" 260,35 748
210 265 10 1/2" 266,70 774
215 270 10 3/4" 273,05 800
220 275 11" 279,40 825
225 280 11" 279,40 850
230 290 11 1/2" 292,10 875
235 290 11 1/2" 292,10 875
240 295 11 3/4" 298,45 900
245 305 12 1/8" 307,97 925
250 310 12 3/8" 314,32 950
255 310 12 3/8" 314,32 950
260 320 12 5/8" 320,67 1000
265 325 12 7/8" 327,00 1000
265 330 13 1/8" 333,37 1000
270 325 12 7/8" 327,00 1015
275 330 13 1/8" 333,15 1015
280 340 13 1/2" 342,90 1054
285 345 13 3/4" 349,25 1079
290 355 14 1/8" 358,77 1104
295 365 14 3/8" 365,12 1130
300 365 14 3/8" 365,12 1130
305 370 14 1/4" 374,65 1155
310 380 15" 381,00 1180
315 385 15 1/4" 387,85 1205
320 390 15 1/2" 393,70 1230
325 390 15 1/2" 393,70 1230
330 400 15 7/8" 403,20 1270
335 405 16 1/8" 409,57 1295
340 415 16 3/8" 415,92 1315
345 430 16 5/8" 422,27 1345
350 435 17 1/4" 422,27 1345
355 430 17" 431,8 1370
*360 435 17 1/4" 438,15 1325
*365 435 17 1/4" 438,15 1325
*370 445 17 5/8" 447,60 1350
*375 445 17 5/8" 447,60 1350
*380 460 18" 457,20 2x760
*380 460 18 1/8" 460,37 2x760
*385 460 18" 457,20 2x760
*385 460 18 1/8" 460,37 2x760
*390 470 18 1/2" 469,90 2x780
*395 470 18 1/2" 469,90 2x780
*400 480 18 7/8" 479,42 2x800
*405 480 18 7/8" 479,42 2x800
*410 490 19 1/4" 488,95 2x820
*415 490 19 1/4" 488,95 2x820
*420 500 19 5/8" 498,47 2x840
*425 500 19 5/8" 498,47 2x840
*430 510 20" 508 2x860
*435 510 20" 508 2x860
*440 520 20 3/8" 517,52 2x880
*440 520 20 1/2" 520,70 2x880
*445 520 20 3/8" 517,52 2x880
*445 520 20 1/2" 520,70 2x880
*450 530 20 7/8" 530,22 2x900
*455 530 20 3/4" 527,05 2x900
*455 530 20 7/8" 530,22 2x900
*460 540 21 1/4" 539,75 2x920
*465 540 21 1/4" 539,75 2x920
*470 550 21 5/8" 549,27 2x940
*475 550 21 5/8" 549,27 2x940
*480 560 22" 558,80 2x960
*485 560 22" 558,80 2x960
*490 570 22 1/2" 571,5 2x980
*495 570 22 1/2" 571,5 2x980
*500 580 22 7/8" 581,02 2x1000
*505 580 22 3/4" 577,85 2x1000
*505 580 22 7/8" 581,02 2x1000
*510 590 23 1/4" 590,55 2x1020
*515 590 23 1/4" 590,55 2x1020
*520 600 23 5/8" 600,07 2x1040
*525 600 23 5/8" 600,07 2x1040
*530 610 24" 609,60 2x1060
*535 610 24" 609,60 2x1060
*540 620 24 3/8" 619,12 2x1080
*545 620 24 3/8" 619,12 2x1080
*550 630 24 3/4" 628,65 2x1100
*555 630 24 3/4" 628,65 2x1100
*560 640 25 1/8" 638,17 2x1120
*565 640 25 1/8" 638,17 2x1120
*570 650 25 5/8" 650,87 2x1140
*575 650 25 5/8" 650,87 2x1140
*580 660 26" 660,40 2x1160
*585 660 26" 660,40 2x1160
*590 670 26 3/8" 669,92 2x1180
*595 670 26 3/8" 669,92 2x1180
*600 680 26 3/4" 679,45 2x1200
*605 680 26 3/4" 679,45 2x1200

 

( * ) Research and Development and is under construction.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
D D1 L
7/8" 1 3/8" 3 1/2"
1" 1 1/2" 4"
1 1/8" 1 5/8" 4 3/8"
1 1/4" 1 3/4" 5"
1 3/8" 1 7/8" 5 1/2"
1 1/2" 2" 6"
1 1/2" 2 1/8" 6"
1 3/4" 2 3/8" 7"
1 3/4" 2 1/2" 7"
2" 2 5/8" 8"
2" 2 3/4" 8"
2" 3" 8"
2 1/4" 3" 8 3/4"
2 3/8" 3 1/4" 9 1/2"
2 1/2" 3 1/4" 10"
2 1/2" 3 3/8" 10"
2 1/2" 3 1/2" 10"
2 5/8" 3 3/8" 11"
2 7/8" 3 1/2" 11"
2 15/16" 4" 12"
3" 4" 12"
3 1/4" 4" 13"
3 1/4" 4 1/4" 13"
3 3/8" 4 1/4" 13 3/8"
3 1/2" 4 3/8" 14"
3 3/4" 4 1/2" 15"
3 7/8" 5" 16"
4" 5" 16"
4" 5 3/8" 16"
4 1/8" 5 1/4" 16 1/2"
4 1/4" 5 1/2" 16"
4 1/4" 5 1/2" 17 3/8"
4 3/8" 5 1/2" 17"
4 1/2" 5 5/8" 18"
4 5/8" 5" 18 7/8"
4 3/4" 6 1/8" 19"
5" 6 1/2" 20"
5 1/2" 7" 22"
5 3/4" 7" 22"
6" 7 1/2" 23 1/2"
6 1/8" 7 1/2" 23 1/2"
6 1/4" 8" 23 5/8"
6 1/2" 8 3/8" 23 5/8"
6 3/4" 8 3/4" 23 5/8"
6 7/8" 8 7/8" 23 5/8"
7" 8 7/8" 23 5/8"
7" 8 7/8" 23 5/8"
7 1/2" 9 1/2" 23 5/8"
7 5/8" 9 1/2" 23 5/8"
7 3/4" 9 7/8" 28 1/2"
7 7/8" 10 1/4" 29 1/2"
8" 10 1/4" 29 1/2"
8 1/4" 10 1/2" 30 1/2"
8 1/4" 10 1/2" 30 1/2"
8 1/2" 10 3/4" 31 1/2"
8 3/4" 11" 32 1/2"
8 7/8" 11 1/4" 33 1/2"
9" 11 1/4" 33 1/2"
9 1/4" 11 1/2" 34 1/2"
9 1/2" 11 3/4" 35 1/2"
9 5/8" 12 1/8" 36 1/2"
9 3/4" 12 1/8" 36 1/2"
9 7/8" 12 3/8" 37 1/2"
10" 12 3/8" 37 1/2"
10 1/4" 12 5/8" 39"
10 1/2" 12 7/8" 39 1/2"
10 1/2" 13 1/8" 39 1/2"
10 5/8" 12 7/8" 40"
10 3/4" 13 1/8" 40"
10 7/8" 13 1/8" 40"
11" 13 1/2" 41 1/2"
11 1/4" 13 3/4" 42 1/2"
11 1/2" 14 1/8" 43 1/2"
11 5/8" 14 3/8" 44 1/2"
11 3/4" 14 3/8" 44 1/2"
11 7/8" 14 3/8" 44 1/2"
12" 14 3/4" 45 1/2"
12 1/4" 15" 46 1/2"
12 1/2" 15 1/4" 47 1/2"
12 5/8" 15 1/2" 48 1/2"
12 3/4" 15 1/2" 48 1/2"
13" 15 7/8" 50"
13 1/4" 16 1/8" 51"
13 1/2" 16 3/8" 51 3/4"
13 5/8" 16 5/8" 53"
13 3/4" 16 5/8" 53"
14" 17" 54"
14 1/8" 17 1/4" 53 1/4"
*14 1/4" 17 1/4" 52 5/16"
*14 3/8" 17 1/4" 52 5/16"
*14 1/2" 17 5/8" 53 1/8"
*14 5/8" 17 5/8" 53 1/8"
*14 3/4" 17 5/8" 53 1/8"
*14 7/8" 18 1/8" 54 5/16"
*15" 18 1/8" 2 x 30''
*15 1/8" 18 1/8" 2 x 30''
*15 1/4" 18 1/8" 2 x 30''
*15 3/8" 18 1/2" 2 x 30 3/4''
*15 1/2" 18 1/2" 2 x 30 3/4''
*15 5/8" 18 1/2" 2 x 30 3/4''
*15 3/4" 18 7/8" 2 x 31 1/2''
*16" 18 7/8" 2 x 31 1/2''
*16 1/4" 19 5/16" 2 x 31 1/2''
*16 3/8" 19 5/16" 2 x 31 1/2''
*16 5/8" 19 3/4" 2 x 33"
*16 3/4" 19 3/4" 2 x 33"
*17" 20 1/8" 2 x 33 7/8''
*17 1/8" 20 1/8" 2 x 33 7/8''
*17 3/8" 20 1/2" 2 x 34 5/8''
*17 1/2" 20 1/2" 2 x 34 5/8''
*17 3/4" 20 7/8" 2 x 35 7/16''
*18" 20 7/8" 2 x 35 7/16''
*18 1/8" 21 1/4" 2 x 36 1/4''
*18 5/16" 21 1/4" 2 x 36 1/4''
*18 1/2" 21 3/4" 2 x 37''
*18 3/4" 21 3/4" 2 x 37''
*19" 22" 2 x 37 3/4''
*19 1/8" 22" 2 x 37 3/4''
*19 3/8" 22 1/2" 2 x 38 9/16''
*19 1/2" 22 1/2" 2 x 38 9/16''
*19 3/4" 22 7/8" 2 x 39 3/8''
*19 7/8" 22 7/8" 2 x 39 3/8''
*20 1/8" 23 1/4" 2 x 40 1/8''
*20 3/8" 23 1/4" 2 x 40 1/8''
*20 1/2" 23 5/8" 2 x 40 15/16''
*20 3/4" 23 5/8" 2 x 40 15/16''
*20 7/8" 24" 2 x 41 3/4''
*21 1/8" 24" 2 x 41 3/4''
*21 3/8" 24 1/2" 2 x 42 1/2''
*21 1/2" 24 1/2" 2 x 42 1/2''
*21 3/4" 24 7/8" 2 x 43 5/16''
*21 7/8" 24 7/8" 2 x 43 5/16''
*22 1/8" 25 1/4" 2 x 44''
*22 1/4" 25 1/4" 2 x 44''
*22 1/2" 25 5/8" 2 x 44 7/8''
*22 5/8" 25 5/8" 2 x 44 7/8''
*22 7/8" 26" 2 x 45 5/8''
*23 1/8" 26" 2 x 45 5/8''
*23 1/4" 26 1/2" 2 x 46 7/16''
*23 1/2" 26 1/2" 2 x 46 7/16''
*23 3/4" 26 7/8" 2 x 47 1/4''
*23 7/8" 26 7/8" 2 x 47 1/4''

 

 

TECHNICAL DETAILS OF THE RUBBER BEARING

Those bearings manufactured by our company are the water slider type of bearings used for the ships, yachts and water pumps. Oil is never used. The water taken from the sea or lakes or the water discharged by the coolers are used as lubricant in such bearings. The rubber acts as a brake on dry surfaces as an intrinsic technical property. But it is a material that allows good slipping on wet surfaces. As an example, the car tires help brake effectively on dry surfaces, but slide easily on wet surfaces. The threads in the tire are used for removing the water from the tire surface. They also improve breaking by ensuring a better contact with the ground. But, in the rubber bearings, supplying plenty of water facilitates better sliding of the shaft on the rubber and prevents wear. Therefore rubber shaft bearings exhibit a longer service life. The wear is minimized.

            THE TOLERANCES IN THE RUBBER SHAFT BEARINGS AND OPERATING CONDITIONS:

Standard rubber bearing clearance:

Shaft diameter Ø20 to Ø100 mm between clearance
Shaft diameter x 0.005 + 0.05 mm = between clearance		 For example: 
Ø100x0.005+0.05=0.55 mm between clearance
   
Shaft diameter Ø100 to Ø150 mm between clearance
Shaft diameter x 0.005 + 0.1 mm = between clearance 		  
   
Shaft diameter Ø150 to Ø200 mm between clearance  
Shaft diameter x 0.005 + 0.15 mm = between clearance		  
   
Shaft diameter Ø200 to Ø600 mm between clearance
Shaft diameter x 0.005 + 0.2 mm = between clearance		 For example:
Ø400x0.005+0.2=2.2 mm between clearance

       In pump bearings Pump shaft diameter x 0.004 or 0.005 = between clearance 

Changing clearance of the rubber bearings = Shaft diameter x 0.020 with 0.025
   
For example: for a 100 mm shaft  = 100 x 0.020 with 0.025
= between clearance 2 mm wiht 2.5 mm

 The ofter shafts can be calculated from the above example.

 

⦁    The surface carrying pressure on the rubber bearings is 4 bars ( 4 KG/cm² )

Shaft diameter: – D  cm    
Bearimgs length: – L cm
                                                                               DxπxLx4
he carrying capacity of the bearings KG.  =    ---------------
                                                                                     3

⦁    Example
                                                                              10x3,14x40x4
 The carrying capacity of  Ø100 mm bearing:   -------------------     = 1675 KG
                                                                                         3     
                                                                          

⦁    The maximum peripheral speed of the rubber bearings is 8 m/sec.

                                                                                             480000 
The speed according to the shaft diameter (rpm)   =      ----------
                                                                                                Dxπ

⦁    Example
Shaft diameter D = 100 mm;                                    480000
The speed according to the shaft diameter:   =     ----------    =  1528   Rpm/Min.
                                                                                  100x3,14
                                                     
                                    
⦁    The minimum amount of water to be used;
⦁    Liter / hour = 0.008xDxL , Shaft diameter = D mm , Rubber bearing length = L mm

Example:
Example: For a 100 mm shaft ;
Liter / Hour = 0.008x100x400 = 320 L/HThe operating temperature range of the rubber bearings is -40°C to +70°c
 
 
 
 

 

NOTE: Our production is made according to the metric and withworth systems. Please contact our company for the special sizes and flanged connection systems.