Skf ok shaft couplings en

OK shaft couplings

Contents 3 4 6 7 8 8 9 10 11 12 13 14 15 15 16 16 17 17 18 20 20 21 21 22

The clever connection The OK coupling explained OKC 100 - 190 OKC 200 - 400 OKC 410 - 490 OKC 500 - 520 OKC 530 - 1000 OKF 100 - 300 OKF 310 - 700 OKCS 178 - 360 OKTC 245 - 790 Tailor-made OK couplings Power transmission capacity Safety factors Shafts Conversion tables Hollow shafts for OKC Hollow shafts for OKCS and OKF Modular equipment for mounting and dismounting Oil Approved by leading classification societies Locating device for outer sleeve Mounting arrangements for OKC couplings The Supergrip bolt cuts down on downtime

The clever connection When using the OK couplings for shaft connections, you take advantage of our powerful oil injection method.

Preparation of the shaft is simple. No keyways to machine, no taper and no thrust ring.

When mounting the OK coupling, a thin inner sleeve with a tapered outer diameter slides onto the shaft. A thick outer sleeve with a matching tapered inner surface fits onto the inner sleeve.

Ordinary mineral oil is then injected between the sleeves. A built-in hydraulic jack drives the outer sleeve up the taper of the inner sleeve.

When the outer sleeve has reached its final position an interference fit is created – just as if the outer sleeve had been heated and shrunk on.

But no heat is required, and the coupling can be removed as easily as it was mounted.

This powerful use of friction enables the OK coupling to transmit torque and axial loads over the entire area of the shaft. There are no stress raisers at the keyway. And no fretting when high shock or reversing loads exist.

Make it the clever way!

Let the OK coupling work for you.

You’ll save both time and money!

3

The OK couplings explained With the OKC and OKF couplings SKF presents benefits impossible to achieve with traditional couplings. The simplicity of mounting and dismounting and the high torque transmission capacity characterised by the OK couplings are achieved using a powerful friction joint.

The five stages below illustrate the principle.

Up to 2011 more than 40 000 couplings have been delivered for use in many various applications.

The OKC coupling (see figure 1 on page 5) has been on the market since the early 40s. OKC couplings are the standard with many well-known controllable pitch propeller manufacturers in the world, but are also used for other applications such as rolling mills, pumps, diesel engines, etc.

The OKCS coupling evolved from a special design for engine builders where the torque requirements were less stringent compared to the shaft diameter.

The OKF coupling (see figure 2 on page 5) was developed to create a simple connection between a cylindrical shaft and engines or gearboxes having a flanged at the thrust shaft. The OKF coupling is available with or without a built-in tool for mounting/ dismounting. Since the coupling is mounted on a cylindrical shaft and not fixed by keyways, it can easily be adjusted axially and rotated to the desired position.

The OK coupling’s higher torque capacity is obtained due to the entire contact surface transmitting torque as opposed to conventional couplings. Since there is no need for keyways, the dimensions of the shafts and the couplings can be reduced. The OK coupling assures a simplified mounting and dismounting procedure.

Very large couplings, which previously could only be shrunk on after heating, can now be assembled cold with the OK method.

Typical installation with OKC and OKF for a propeller shaft line.

‘

4

When oil has drained from the contact surfaces of the two sleeves and friction has been restored, low pressure B is released. All oil connections are plugged. The exposed parts of the coupling should be covered with a rust preventive and the coupling is ready for years of trouble-free operation.

A

A

A

‘

‘

B

‘

5.

The coupling has reached its final position when the outer diameter of the coupling has grown by a predetermined value.

The oil pump is stopped, but pressure in B must remain.

Pressure in A is released.

A

‘

4.

B

‘

When there is a good oil film between the sleeves, oil leaks out at the thick end of the inner sleeve. Oil is pumped into B and the outer sleeve starts moving up the taper. Oil is continuously injected between the sleeves (A), in order to avoid metallic contact.

A

‘

3.

A

‘

Oil is injected into A under high pressure, building up an oil film between the inner and outer sleeves, eliminating metallic contact and reducing friction forces.

A

‘

2.

B

‘

The coupling is put into position. High pressure injectors are connected to A, and a low pressure to the hydraulic chamber B.

‘

1.

‘

And this is what happens...

A

Fig. 1 The OKC coupling.

Fig. 2 The OKF coupling.

5

Shaft couplings

OKC 100 – 190 Couplings in sizes OKC 180 – OKC 190 are provided with two injection holes A1 BSP 1/4”

A3

BSP 3/4”

A2 D

da h7/E7

A

BSP 1/4” = G 1/4 BSP 3/4” = G 3/4

Designation1)

da mm

D mm

A mm

A1 mm

A2 mm

A32) mm

D3) mm

Mass kg

OKC 100 OKC 110 OKC 120

100 110 120

170 185 200

275 296 322

260 280 300

108 118 130

8 8 10

0,16 0,17 0,18

30 38 48

26,0 34,6 44,9

OKC 130 OKC 140 OKC 150

130 140 150

215 230 250

344 373 396

325 350 370

140 150 162

10 10 12

0,21 0,23 0,23

58 71 91

57,1 71,3 87,7

OKC 160 OKC 170 OKC 180

160 170 180

260 280 300

420 442 475

395 415 445

172 182 195

12 12 15

0,27 0,27 0,28

101 125 155

107 128 152

OKC 190

190

310

505

475

205

15

0,31

175

179

1)

Couplings for shafts of intermediate diameters are, for instance, designated OKC 148.

2)

May be slightly greater or smaller when D is reached, depending on how the tolerance of coupling seatings and coupling bore have been used.

3)

Increase of outer diameter, D, after mounting.

4)

The safety factor referred to on page 15 must be applied to obtain the permissible torque.

Note: Required free length on one shaft for installation A + 75 mm.

6

Mt max.4) kNm

Shaft couplings

OKC 200 – 400 Couplings OKC 300 – OKC 490 have threaded holes for lifting at both ends.

Thread OKC A3

A1 BSP 3/4”

BSP 1/4”

A4

300 – 380: M20 x 2,5 390 – 440: M24 x 3 450 – 490: M30 x 3,5

G

A2 D

A

da h7/E7

BSP 1/4” = G 1/4 BSP 3/4” = G 3/4

Designation1)

da mm

D mm

A1 mm

A2 mm

A32) mm

A4 mm

D3) mm

G

OKC 200 OKC 210 OKC 220

200 210 220

330 340 360

525 550 575

500 520 540

215 225 235

15 15 15

30 30 30

0,31 0,35 0,35

M12-(4x) M12-(4x) M12-(4x)

215 230 265

208 241 277

OKC 230 OKC 240 OKC 250

230 240 250

370 390 400

600 620 645

565 585 610

250 260 270

20 20 20

30 30 30

0,38 0,38 0,41

M12-(4x) M12-(4x) M12-(4x)

285 330 350

317 360 407

OKC 260 OKC 270 OKC 280

260 270 280

420 440 450

670 690 715

635 655 680

280 290 300

20 20 20

30 30 30

0,42 0,42 0,46

M12-(4x) M12-(4x) M12-(4x)

410 470 510

457 512 571

OKC 290 OKC 300 OKC 310

290 300 310

470 480 500

740 773 793

700 730 750

315 325 335

25 25 25

30 27 27

0,46 0,50 0,50

M12-(4x) M16-(4x) M16-(4x)

580 625 700

634 702 775

OKC 320 OKC 330 OKC 340

320 330 340

520 530 550

818 843 863

770 795 815

345 355 365

25 25 25

27 27 27

0,50 0,54 0,54

M16-(4x) M16-(4x) M16-(4x)

790 830 930

852 935 1 020

OKC 350 OKC 360 OKC 370

350 360 370

560 580 600

888 908 928

840 860 880

375 385 395

25 25 25

27 27 27

0,57 0,58 0,58

M16-(4x) M16-(4x) M16-(4x)

980 1 080 1 190

1 120 1 220 1 320

OKC 380 OKC 390 OKC 400

380 390 400

610 630 640

958 983 1 003

905 925 950

410 420 430

30 30 30

27 27 27

0,61 0,62 0,65

M16-(4x) M16-(4x) M16-(4x)

1 250 1 370 1 440

1 430 1 550 1 670

A mm

1)

Couplings for shafts of intermediate diameters are, for instance, designated OKC 148.

2)

May be slightly greater or smaller when D is reached, depending on how the tolerance of coupling seatings and coupling bore have been used.

3)

Increase of outer diameter, D, after mounting.

4)

The safety factor referred to on page 15 must be applied to obtain the permissible torque.

Mass kg

Mt max.4) kNm

Note: Required free length on one shaft for installation A + 75 mm.

7

Shaft couplings

OKC 410 – 490 Designation1)

da mm

D mm

A mm

A1 mm

A2 mm

A32) mm

A4 mm

D3) mm

G

Mass kg

Mt max.4) kNm

OKC 410 OKC 420 OKC 430

410 420 430

660 680 690

1 028 1 053 1 073

975 995 1 015

440 450 460

30 30 30

27 27 27

0,66 0,67 0,69

M16-(4x) M16-(4x) M16-(4x)

1 580 1 730 1 800

1 800 1 930 2 070

OKC 440 OKC 450 OKC 460

440 450 460

710 720 740

1 098 1 123 1 148

1 040 1 065 1 085

470 485 495

30 35 35

27 27 27

0,69 0,74 0,74

M16-(4x) M16-(4x) M16-(4x)

1 960 2 050 2 200

2 220 2 370 2 530

OKC 470 OKC 480 OKC 490

470 480 490

750 760 780

1 170 1 195 1 215

1 110 1 135 1 155

505 515 525

35 35 35

27 27 27

0,77 0,80 0,81

M16-(4x) M16-(4x) M16-(4x)

2 290 2 360 2 530

2 700 2 880 3 060

1) 2)

3) 4)

Couplings for shafts of intermediate diameters are, for instance, designated OKC 299.

May be slightly greater or smaller when D is reached, depending on how the tolerance of coupling seatings and coupling bore have been used.

Increase of outer diameter, D, after mounting.

The safety factor referred to on page 15 must be applied to obtain the permissible torque.

Note: Required free length on one shaft for installation A + 75 mm.

Shaft couplings

OKC 500 – 520 A1 BSP 1/4” BSP 1/2”

A4

Couplings OKC 500 – OKC 1000 have threaded holes for lifting at both ends Thread OKC 500 – 520: M30 x 3,5 530 – 610: M36 x 4 620 – 690: M42 x 4,5 700 – 770: M48 x 5 780 – 1000: M64 x 6

A3 BSP 3/4” G

A2 D

A

da h7/E7

BSP 1/4” = G 1/4 BSP 3/4” = G 3/4 BSP 1/2” = G 1/2 Designation1)

da mm

D mm

A mm

A1 mm

A2 mm

A32) mm

A4 mm

D3) mm

G

Mass kg

Mt max.4) kNm

OKC 500 OKC 510 OKC 520

500 510 520

790 810 830

1 240 1 265 1 290

1 175 1 200 1 225

535 545 560

35 35 40

42 42 42

0,84 0,86 0,86

M20-(4x) M20-(4x) M20-(4x)

2 610 2 820 3 060

3 250 3 450 3 660

8

Shaft couplings

OKC 530 – 1000 Designation1)

da mm

D mm

A mm

A1 mm

A2 mm

A32) mm

A4 mm

D3) mm

G

Mass kg

Mt max.4) kNm

OKC 530 OKC 540 OKC 550

530 540 550

840 860 870

1 315 1 340 1 360

1 250 1 275 1 295

570 580 590

40 40 40

42 42 42

0,89 0,89 0,93

M20-(4x) M20-(4x) M20-(4x)

3 140 3 400 3 520

3 870 4 100 4 330

OKC 560 OKC 570 OKC 580

560 570 580

890 900 920

1 385 1 405 1 425

1 315 1 335 1 360

600 610 620

40 40 40

42 42 42

0,93 0,97 0,96

M20-(4x) M20-(4x) M20-(4x)

3 760 3 840 4 150

4 570 4 820 5 080

OKC 590 OKC 600 OKC 610

590 600 610

930 940 960

1 455 1 480 1 500

1 385 1 410 1 430

635 645 655

45 45 45

42 42 42

0,99 1,02 1,03

M20-(4x) M20-(4x) M20-(4x)

4 270 4 400 4 680

5 340 5 620 5 900

OKC 620 OKC 630 OKC 640

620 630 640

970 990 1 010

1 525 1 545 1 570

1 455 1 475 1 495

665 675 685

45 45 45

42 42 42

1,06 1,06 1,07

M20-(4x) M20-(4x) M20-(4x)

4 840 5 140 5 460

6 200 6 500 6 820

OKC 650 OKC 660 OKC 670

650 660 670

1 020 1 040 1 050

1 595 1 625 1 650

1 520 1 545 1 575

695 710 720

45 50 50

42 42 42

1,10 1,11 1,14

M20-(4x) M20-(4x) M20-(4x)

5 620 5 940 6 150

7 140 7 480 7 820

OKC 680 OKC 690 OKC 700

680 690 700

1 070 1 080 1 090

1 670 1 695 1 720

1 590 1 615 1 640

730 740 750

50 50 50

42 42 42

1,14 1,18 1,21

M20-(4x) M20-(4x) M20-(4x)

6 480 6 670 6 830

8 180 8 540 8 920

OKC 710 OKC 720 OKC 730

710 720 730

1 100 1 120 1 130

1 745 1 765 1 790

1 665 1 680 1 700

760 770 785

50 50 55

42 42 42

1,24 1,25 1,28

M20-(4x) M20-(4x) M20-(4x)

7 010 7 390 7 550

9 310 9 700 10 100

OKC 740 OKC 750 OKC 760

740 750 760

1 150 1 160 1 180

1 815 1 835 1 860

1 730 1 750 1 770

795 805 815

55 55 55

42 42 42

1,28 1,32 1,32

M20-(4x) M20-(4x) M20-(4x)

7 990 8 180 8 660

10 600 11 000 11 400

OKC 770 OKC 780 OKC 790

770 780 790

1 190 1 210 1 220

1 886 1 910 1 930

1 795 1 815 1 840

825 835 845

55 55 55

42 42 42

1,36 1,36 1,39

M20-(4x) M20-(4x) M20-(4x)

8 860 9 330 9 530

11 800 12 300 12 800

OKC 800 OKC 820 OKC 840

800 820 840

1 240 1 260 1 300

1 960 2 015 2 055

1 865 1 920 1 960

860 880 900

60 60 60

42 42 42

1,39 1,47 1,47

M20-(4x) M20-(4x) M20-(4x)

10 070 10 520 11 560

13 300 14 300 15 400

OKC 860 OKC 880 OKC 900

860 880 900

1 330 1 360 1 390

2 105 2 155 2 200

2 005 2 055 2 100

920 945 965

60 65 65

42 42 42

1,51 1,54 1,58

M20-(4x) M20-(4x) M20-(4x)

12 370 13 230 14 020

16 500 17 700 18 900

OKC 920 OKC 940 OKC 960

920 940 960

1 430 1 460 1 490

2 245 2 295 2 340

2 145 2 190 2 235

985 1 010 1 030

65 70 70

42 42 42

1,59 1,62 1,66

M20-(4x) M20-(4x) M20-(4x)

15 290 16 270 17 270

20 200 21 600 23 000

980 1 000

1 520 1 550

2 385 2 430

2 280 2 325

1 050 1 070

70 70

42 42

1,69 1,73

M20-(4x) M20-(4x)

18 310 19 390

24 400 26 000

OKC 980 OKC 1000 1)

Couplings for shafts of intermediate diameters are, for instance, designated OKC 505.

2)

May be slightly greater or smaller when D is reached, depending on how the tolerance of coupling seatings and coupling bore have been used.

3)

Increase of outer diameter, D, after mounting.

4)

The safety factor referred to on page 15 must be applied to obtain the permissible torque.

Note: Required free length on one shaft for installation A + 100 mm.

9

Flange couplings

OKF 100 – 300 A A1 C

Drive-up length

B

BSP 3/4”

R

BSP 1/4” BSP 3/4”

D1 D

L da h7/F7 L1

BSP 1/4” = G 1/4 BSP 3/4” = G 3/4

Lock levels from size OKF 300

The pitch circle is evaluated from: E = D1 – (1.6 x bolt diameter)

Designation mm

da

D

D1

A

A1

B

R

L

L1

C

Mass

Mt max.1)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

kNm

OKF 100 OKF 110 OKF 120

100 110 120

165 175 195

235 260 285

191 210 220

188 197 206

40 40 40

8 9 10

120 135 145

15 15 15

17,5 18,5 19,0

25 29 39

26,0 34,6 44,9

OKF 130 OKF 140 OKF 150

130 140 150

205 225 240

305 325 345

244 255 266

230 235 246

40 40 40

10 11 12

165 170 180

15 15 15

21,5 22,0 23,0

46 56 66

57,1 71,3 87,7

OKF 160 OKF 170 OKF 180

160 170 180

255 265 290

365 390 415

278 295 310

257 274 288

40 40 40

13 14 14

195 205 215

15 15 15

24,5 26,0 26,5

77 87 108

107 128 152

OKF 190 OKF 200 OKF 210

190 200 210

295 315 325

435 455 475

338 348 362

311 320 338

40 40 42

15 16 17

230 240 250

18 18 18

29,5 30,0 31,5

118 138 153

179 208 241

OKF 220 OKF 230 OKF 240

220 230 240

345 350 370

495 500 525

378 390 402

353 365 376

44 46 48

18 18 19

265 275 285

18 18 18

31,5 34,5 34,5

180 184 216

277 317 360

OKF 250 OKF 260 OKF 270

250 260 270

380 400 420

555 575 595

418 436 452

392 408 424

50 52 54

20 21 22

300 310 325

18 22 22

36,0 38,0 38,0

238 275 316

407 457 512

r ss

OKF 280 OKF 290 OKF 300

280 290 300

430 445 460

605 620 635

464 476 498

435 447 463

56 58 60

22 23 24

335 345 360

22 22 22

40,0 41,5 42,0

335 364 399

571 634 702

f OKBS 40 s s c

1)

The safety factor referred to on page 15 must be applied to obtain permissible torque.

10

Suitable Supergrip Bolt size

Flange couplings

OKF 310 – 700 Designation OKF 310 OKF 320 OKF 330

da

D

D1

A

A1

B

R

L

L1

C

Mass

Mt max.1)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

kNm

62 64 66

25 26 26

370 380 395

22 25 25

43,5 44,5 46,5

310 320 330

475 495 505

675 695 705

510 526 544

479 494 512

451 508 537

775 r 852 s 935 s

OKF 340 OKF 350 OKF 360

340 350 360

525 530 550

730 735 760

555 572 584

522 538 550

68 70 72

27 28 29

405 420 430

25 25 25

47,0 49,0 50,0

599 615 680

f s 1 020 s 1 120 s 1 220 c

OKF 370 OKF 380 OKF 390

370 380 390

570 580 600

810 820 840

595 612 624

560 577 588

74 76 78

30 30 31

440 455 465

25 25 25

50,5 51,5 52,5

770 805 885

1 320 r 1 430 s 1 550 f

OKF 400 OKF 410 OKF 420

400 410 420

610 630 640

855 875 890

648 660 672

611 627 639

80 82 84

32 33 34

480 490 500

25 30 30

54,0 55,5 57,5

930 1 030 1 070

s 1 670 s 1 800 s 1 930 c

OKF 430 OKF 440 OKF 450

430 440 450

655 675 685

935 955 970

688 700 716

654 665 681

86 88 90

34 35 36

515 525 540

30 30 30

58,0 58,5 60,5

1 170 1 270 1 330

2 070 r 2 220 s 2 370 s

OKF 460 OKF 470 OKF 480

460 470 480

700 715 720

985 1 000 1 005

728 740 758

692 703 717

92 94 96

37 38 38

550 560 570

30 30 30

61,5 62,5 65,0

1 410 1 480 1 510

2 530 f 2 700 s 2 880 s

OKF 490 OKF 500 OKF 510

490 500 510

740 750 770

1 030 1 040 1 090

770 790 810

728 748 766

98 100 102

39 40 41

580 600 610

30 30 35

66,0 67,0 69,5

1 630 1 700 1 870

3 060 s 3 250 c 3 450 r

OKF 520 OKF 530 OKF 540

520 530 540

790 800 815

1 115 1 125 1 145

820 834 845

776 789 800

104 106 108

42 42 43

620 630 640

35 35 35

70,0 72,0 73,5

2 020 2 080 2 190

OKF 550 OKF 560 OKF 570

550 560 570

825 845 855

1 155 1 175 1 190

868 878 890

822 832 843

110 112 114

44 45 46

660 670 680

35 35 35

74,5 75,0 77,0

2 270 2 420 2 510

s s sf s s 4 330 s 4 570 s 4 820 c

OKF 580 OKF 590 OKF 600

580 590 600

875 885 895

1 235 1 245 1 260

900 914 926

853 866 877

116 118 120

46 47 48

690 700 710

35 35 35

77,0 79,0 81,0

2 710 2 780 2 860

5 080 r 5 340 s 5 620 s

OKF 610 OKF 620 OKF 630

610 620 630

910 920 940

1 275 1 290 1 310

938 950 962

888 900 911

122 124 126

49 50 50

720 730 740

35 35 35

82,0 84,0 84,5

2 880 3 070 3 230

5 900 f 6 200 6 500 s

OKF 640 OKF 650 OKF 660

640 650 660

960 970 990

1 330 990 1 345 1 004 1 395 1 018

938 951 961

128 130 132

51 52 53

760 770 780

40 40 40

85,5 87,5 88,0

3 510 3 600 3 750

6 820 s 7 140 c 7 480 r

OKF 670 OKF 680 OKF 690

670 680 690

995 1 015 1 025

1 410 1 030 1 420 1 042 1 435 1 054

973 984 996

134 136 138

54 54 55

790 800 810

40 40 40

91,0 91,5 93,5

3 930 4 130 4 230

s 7 820 s 8 180 f 8 540 s

OKF 700

700

1 035

1 445 1 068 1 009

140

56

820

40

96,0

4 330

8 920 c

Suitable Supergrip Bolt size

OKBS 50

OKBS 60

s

3 660 3 870 4 100

OKBS 70

OKBS 80

s OKBS 90

s

OKBS 100

s 1)

The safety factor referred to on page 15 must be applied to obtain the permissible torque.

11

Shaft couplings

OKCS 178 – 360 A A1 BSP 1/4”

10

–0 – 0,5

BSP 3/4”

A2 da D h6/F7

F

BSP 1/4” = G 1/4 BSP 3/4” = G 3/4 Designation1)

da mm

D mm

A mm

A1 mm

A2 mm

F mm

Mass kg

Mt max.2) kNm

OKCS 178 OKCS 210 OKCS 214

178 210 214

310 350 365

282 331 345

244 295 308

105 127,5 132

8 8 8

98 166 170

65 110 118,6

OKCS 230 OKCS 250 OKCS 270

230 250 270

400 420 460

348 364 386

315 328 350

134,5 140 149

8 8 8

209 231 300

141 180 225

OKCS 300 OKCS 310 OKCS 330 OKCS 360

300 310 330 360

510 525 560 600

426 446 457 493

385 400 410 455

164 170 177 190

9 9 9 9

406 429 521 635

301,8 338,8 391,5 525

1)

Couplings for shafts of intermediate diameters are, for instance, designated OKCS 215.

2)

The safety factor referred to on page 15 must be applied to obtain the permissible torque

Note: Required free length on one shaft for installation A + 75 mm.

12

Hydraulic rings and propeller nuts

OKTC 245 – 790 L BSP 1/4”

Propeller nut

Propeller nut

Propeller

Propeller nut

Propeller

Propeller

d Ø D1 d1 d2 Ø D2

S

Nut with integrated thread is designated OKTH.

Designation

d mm

D1 mm

d1 mm

d2 mm

D2 mm

L mm

Smax. mm

Max. force kN (at 70 MPa)

Mass kg

OKTC 245 OKTC 265 OKTC 285

260 – 275 275 – 295 295 – 315

245 265 285

275 295 315

340 365 385

390 415 435

55 55 55

15 15 15

2 195 2 540 2 690

31 35 37

OKTC 305 OKTC 325 OKTC 345

315 – 335 335 – 365 365 – 385

305 325 345

335 365 385

415 445 470

465 510 535

55 70 70

15 20 20

3 295 3 560 3 995

42 66 72

OKTC 365 OKTC 385 OKTC 405

385 – 405 405 – 425 425 – 445

365 385 405

405 425 445

495 520 545

560 585 610

70 70 70

20 20 20

4 450 4 935 5 440

77 84 90

OKTC 425 OKTC 445 OKTC 465

445 – 465 465 – 485 485 – 505

425 445 465

465 485 505

570 595 620

635 660 685

70 70 70

20 20 20

5 975 6 530 7 110

96 103 110

OKTC 485 OKTC 505 OKTC 525

505 – 525 525 – 545 545 – 565

485 505 525

525 545 565

645 670 695

710 735 760

70 70 70

20 20 20

7 715 8 350 9 005

116 123 130

OKTC 545 OKTC 565 OKTC 585

565 – 595 595 – 615 615 – 635

545 565 585

595 615 635

725 750 775

805 830 855

90 90 90

25 25 25

9 430 10 130 10 850

195 205 216

OKTC 605 OKTC 625 OKTC 645

635 – 655 655 – 675 675 – 695

605 625 645

655 675 695

800 825 860

880 905 940

90 90 90

25 25 25

11 595 12 370 14 105

226 238 260

OKTC 670 OKTC 690 OKTC 720

695 – 720 720 – 740 740 – 770

670 690 720

720 740 770

885 915 955

965 995 1 050

90 90 100

25 25 30

14 560 15 920 17 545

267 285 360

OKTC 750 OKTC 770 OKTC 790

770 – 800 800 – 820 820 – 840

750 770 790

800 820 840

985 1 010 1 035

1 080 1 105 1 130

100 100 100

30 30 30

18 155 19 115 20 100

372 387 402

This list is designed as a guide. If the ring you require is not listed, please contact your closest distributor, and we will design a ring for you on the receipt of the following information: a. Dimensions of propeller boss. b. Maximum power, kW. c. Speed, r/min. d. Safety factor. e. Modulus of elasticity for boss and shaft respectively, N/mm2. f. Temperature coefficient of linear expansion for boss and shaft respectively. g. Yield point for shaft and boss, N/mm2.

If drive-up force and drive-up length is being calculated by customer that information together with the propeller shaft thread and the small inner diameter of the propeller boss only are required.

SKF pump 728619 E is recommended for the ring as well as for injecting oil in the propeller hub. For sizes OKTC 505 or larger, an air driven pump, THAP 150 is recommended.

13

Tailor-made OK couplings Besides standard series of OK couplings, SKF Coupling Systems design and manufacture ‘‘tailor-made’’ OK couplings for shaft diameters from 100 mm and up.

Some examples:

Flange couplings with oil chamber under the flange and Supergrip bolts combination for limited space

Double sleeve arrangement for bearing installation

Hub for gear couplings

Oil power shrink disc couplings

Double flange couplings

14

Power transmission capacity Torque transmitted by the OKC coupling is directly proportional to the surface pressure between the inner sleeve of the coupling and the shaft after the outer sleeve has been driven up axially. The necessary driveup, which is reached when the diameter of the outer sleeve has increased by dimension D for OKC and OKCS couplings, and the stated drive-up length for OKF couplings given in the tables, will ensure a pressure of 120 N/mm2 for OKC couplings, and 100 N/mm2 for OKF couplings.

If the coupling is subjected to axial forces, their effect on the power transmission capacity is generally insignificant. The transmissible torque is obtained from the equation:

P Mtmax.

The table lists the maximum torque which can be transmitted calculated using the equation:

t F xd y 2 a a s v 2 x 103 b

– a

where:

p . da2 . B . p . µ Mtmax. = 2 .103

Mtmax.

maximum transmissible torque, Nm

Fa

axial force, N

da

shaft diameter, mm

The permissible torque is obtained from:

where: Mtmax.

maximum transmissible torque, Nm

da

shaft diameter, mm

B

effective pressure length (equal to da for OKC) in mm

p

minimum surface pressure between shaft and inner sleeve in N/mm2 – 120 N/mm2 for OKC and OKCS – 100 N/mm2 for OKF

µ

2

Mt =

M=

Mtmax. or Mt f

where M

permissible torque, Nm

Mtmax.

maximum transmissible torque, Nm

Mt

transmissible torque, Nm

f

safety factor, which can be selected from the table below

coefficient of friction (0,14)

Safety factor f at different loads Type of power source

Type of load on the driven machine Uniform load Centrifugal pumps Fans Light conveyors Turbo compressors Agitators

Moderate shock-loads Piston compressors Small piston pumps Cutting tool machines Packeting machines Wood working machines

Heavy shock-loads Excenter presses Draw benches Plane machines Large piston compressors

Electric motor, turbine

2

2,25 – 2,5

2,5 – 2,75

Multiple cylinder piston engine

2,25 – 2,5

2,5 – 2,75

2,75 – 3

Single cylinder piston engine

2,75 – 3

3

3,25 – 4

– 2,25

– 3,25

When the coupling is intended for marine applications, the safety factor has to be selected according to the rules of the referred classification society.

15

Shafts To facilitate shaft alignment for OKC and OKCS couplings one of the shafts should be so designed that the coupling can be slid along it far enough to expose the outermost part of the coupling seating.

Ø da

Surface roughness is to be within Ra 2,5 µm.

ISO tolerance h8 applies to coupling seatings from 25 - 90 mm. ISO tolerance h7 is used for larger diameters.

Shaft diameter da over mm

to mm

IT 7 2

Tolerance

Cylindricity tolerance

h7 deviation upper lower µm µm

IT7 2 µm

100 120 180

120 180 250

0 0 0

– 35 – 40 – 46

17,5 20 23

250 315 400

315 400 500

0 0 0

– 52 – 57 – 63

26 28,5 31,5

500 630 800

630 800 1 000

0 0 0

– 70 – 80 – 90

35 40 45

Conversion tables Conversion: millimetre to inch Shaft diameter da Millimetre Inch over to over to

Tolerance h7 deviation Millimetre upper lower

Inch upper

100 120 180

120 180 250

3,937 4,724 7,087

4,724 7,087 9,843

0 0 0

– 0,035 – 0,040 – 0,046

0 0 0

– 0,001378 – 0,001575 – 0,001811

250 315 400

315 9,843 400 12,402 500 15,748

12,402 15,748 19,685

0 0 0

– 0,052 – 0,058 – 0,063

0 0 0

– 0,002047 – 0,002244 – 0,002480

500 630 800

630 19,685 800 24,803 1 000 31,496

24,803 31,496 39,370

0 0 0

– 0,070 – 0,080 – 0,090

0 0 0

– 0,002756 – 0,003150 – 0,003543

Length

1 mm = 0,03937 in 1 in = 25,4 mm

Mass

1 kg = 2,205 lb 1 lb = 0,4536 kg

Force

1 N = 0,225 lbf 1 lbf = 4,45 N

Torque

1 Nmm = 0,00885 in.lbf 1 Nm = 8,85 in.lbf 1 lbf.in = 113 Nmm = 0,113 Nm 1 lbf.ft = 1356,23 Nmm = 1,35623 Nm

Power

1 W = 0,00136 HP 1 HP = 736 W

Pressure

1 MPa = 1 N/mm2 = 145 psi 1 psi = 0,007 N/mm2 = 0,007 MPa

Kinematic viscosity

1 mm2/s = 1 cSt

lower

Temperature 0 °C = 32 °F °F = 1,8 x °C + 32

16

Hollow shafts for OKC couplings The outer sleeve must be driven further up with hollow shafts than with solid ones if the same pressure and power transmission capacity are to be achieved. The shafts must also be reinforced by means of sleeves shrunk into recess turned beneath the coupling seatings. This will prevent the stresses, which arise in the shaft material when the coupling has been mounted, from exceeding the permissible value.

The reinforcement sleeve should be made of toughened steel with a yield point of at least 850 N/mm2.

The length of the sleeves should be 15 mm longer than the pressure length (= A2 - A3 + 15 mm). The outside diameter, the required interference between the sleeves and the shafts, and the increase in the drive-up distance (the reduction in dimension A3) can be obtained from the table below for various values of diameter ratio dc/da.

Suitable tolerance ranges for the outside diameter of the sleeves and the recesses in the shafts are IT6 and IT7 respectively. Note that the coupling seatings should be machined to the prescribed diameter tolerance only after the reinforcement sleeves have been fitted. dc da

db da

d db

R da

0,1 0,15 0,2

0,38 0,41 0,45

0,0006 0,0008 0,0009

0,001 0,002 0,004

0,25 0,3 0,35

0,48 0,49 0,51

0,0011 0,0013 0,0015

0,006 0,009 0,013

0,4 0,45 0,5 0,55

0,54 0,58 0,62 0,67

0,0017 0,0019 0,0021 0,0023

0,018 0,024 0,031 0,040

Example: An OKC coupling is to be mounted on shafts with an outside diameter of 400 mm and a bore of 120 mm. i.e.

dc 120 = = 0,3 da 400

The outside diameter of the reinforcement sleeve is d obtained from b = 0,49, i.e. db = 196 mm. da The interference d is obtained from d = 0,0013, i.e. d = 0,25 mm db The increase in drive-up distance, R, is obtained R from the ratio = 0,009. Thus dimension A3 in da the table on page 7 (30 mm) must be reduced by 3,6 mm.

A3– R

dc db da

With hollow shafts whose diameter ratio exceeds 0,55 the normal pressure and transmitted torque cannot be fully achieved. In such cases, please consult us or your local representative.

Hollow shafts for OKCS and OKF couplings For OKCS and OKF couplings mounted on hollow shafts, please contact your local representative.

17

Modular equipment for mounting and dismounting

TMHK 36 Suitable for OKC 100 - OKC 170 and OKCS 178 - OKCS 360 1 Tool case 728245/3A 1 Oil injector 226400 1 Hand operated pump TMJL 50 1 Set of hex keys 1 Spare parts for injector 226400 Mass: 19 kg

TMHK 37 Suitable for OKC 180 - OKC 250 and OKF 100 - OKF 300 1 Tool case 728245/3A 2 Oil injectors 226400 1 Hand operated pump TMJL 50 1 Pipe 227958A 1 Adapter block 226402 1 Set of hex keys 1 Spare parts for injector 226400 Mass: 28,1 kg Set TMHK 38 can also be used for these coupling sizes.

The set contains a hydraulic pump driven by compressed air which enables the coupling to be mounted more quickly.

TMHK 38 Suitable for OKC 180 - OKC 490 and OKF 300 - OKF 700 1 Air-driven pump set THAP 030/SET 1 Return hose 729147A 2 Oil injectors 226400 1 Set of hex keys 1 Spare parts for injector 226400 Mass: 32,1 kg

18

TMHK 38S Suitable for OKC 180 - OKC 490 and OKF 300 - OKF 700 1 Air-driven pump set THAP 030/SET 1 Return hose 729147A 1 Air-driven pump THAP 300E 1 Oil injector 226400 1 Set of hex keys 1 Spare parts for injector 226400 Mass: 78,2 kg including weight of pallet

TMHK 39 Suitable for OKC 500 and larger 1 Air-driven pump set THAP 030/SET 1 Return hose 729147A 3 Oil injectors 226400 1 Set of hex keys 1 Spare parts for injector 226400 Mass: 35,1 kg This set is intended for use on board ship where dismounting and mounting is only carried out infrequently. For shipyards and workshops sets TMHK 40 or TMHK 41 with an air-driven high pressure pump are recommended.

TMHK 40 Suitable for OKC 500 and larger 1 Air-driven pump set THAP 030/SET 1 Return hose 729147A 1 Air-driven pump THAP 300E 2 Oil injectors 226400 1 Set of hex keys 1 Spare parts for injector 226400 Mass: 80,2 kg including weight of pallet This set or also set TMHK 41 are recommended for shipyards and workshops. The air-driven high pressure pump simplifies works considerably.

TMHK 41 Suitable for OKC 500 and larger 1 Air-driven pump set THAP 030/SET 1 Return hose 729147A 3 Air-driven pumps THAP 300E 1 Set of hex keys Mass: 132,7 kg including weight of pallet This pump set is recommended for shipyards and workshops.

19

Oil The mineral motor oil to be used for the pump and the injectors should have a viscosity of 300 mm2/s (300 cSt) at the temperature of the coupling. This viscosity will generally be obtained with sufficient accuracy if the oil is chosen according to the table below.

Temperature range

0 – 8 °C 8 – 18 °C 18 – 27 °C 27 – 32 °C 32 – 38 °C

Viscosity

mineral motor oil mineral motor oil mineral motor oil mineral motor oil mineral motor oil

SAE 10 W SAE 20 W SAE 30 W SAE 40 W SAE 50 W

Approved by all leading classification societies Connecting rigid shafts with OK couplings is a timesaving solution that has been usen on land and at sea for more than fifty years. The couplings are well known all over the world for their high quality, creative design and operational safety.

In the production line each step is carefully controlled and the finished couplings are subjected to a rigid final inspection regarding dimensions and steel quality before delivery. The couplings are also approved by all major classification societies, for example Det Norske Veritas.

20

Locating device for outer sleeve and nut All OKC couplings for shafts with diameters 200 mm or bigger and OKF couplings for shafts with diameter 300 mm or bigger are equipped with lock levers, which prevent the outer sleeve from being driven up un-

Locating device before mounting

intentionally on the inner sleeve during transport and when the coupling is being mounted or dismounted.

The lock levers also lock the nut when the coupling has been installed.

Locating device after mounting

Mounting arrangements for OKC couplings To facilitate the mounting and dismounting of large OKC couplings, it is advisable to use some type of lifting arrangement. The types of arrangements shown will also allow radial shaft alignment.

In both cases the carriages should move in line with the shafts.

OPTION I A wheeled carriage is provided with two hydraulic jacks, positioned as shown. This allows the coupling to be adjusted as required.

OPTION II An overhead carriage with two fixed chain blocks is positioned above the coupling. Lifting ropes are positioned as shown giving the required adjustment or lifting eyebolts can be used from size OKC ≤ 400.

21

The Supergrip bolt cuts down on downtime At a time when maintenance cost efficiency in heavy industries is a make-or-break factor in operational economy, the time-saving Supergrip concept can cut costs dramatically.

When you connect your couplings with Supergrip bolts, there is no uncertainty about the length of downtime for removing the bolts. No worry about whether the bolts have jammed or seized in the holes. You know that once the tension and expansion pressure have been released, each bolt will slide out as easily as it went in.

Ninety percent reduction of downtime A study released by the Swedish State Power Board on the comparison of individually fitted bolts with Supergrip bolts showed a 90 % reduction in the time required to disassemble and reassemble the couplings of two turbo sets (eight couplings).

The unit equipped with Supergrip bolts was reconnected to the power grid 48 hours earlier than the unit with conventional bolts. Total savings were 19 200 000 kWh (48 hours x 400 MW).

Oil injection method The Supergrip bolts are a superior solution for connecting rotating flange couplings.

Compared with traditional bolt systems, Supergrip bolts are easier to install and remove, take much less time and hold the coupling halves together much more securely.

The torque in a coupling connected with Supergrip bolts is transmitted in two ways: by shear strength of the expanded bolt in the hole, and by the friction effect at the flange faces created by pre-loading the bolt.

Designed specifically for such high-torque applications as propeller shafts, rudder assemblies, turbo generators, the Supergrip bolt offers significant advantages.

Simplified machining of the holes and no grinding of the bolts. You eliminate re-reaming and re-honing. The bolts are designed to be inserted and removed with an initial clearance fit. There is no risk of seizure.

It is easy to see why we have delivered some 150 000 bolts over the years!

For more detailed information and design recommendations, please ask for our Supergrip brochure.

22

The oil injection method used in our OK couplings was developed by us in the early 1940s. Since then more than 40 000 couplings have been supplied to ships, power installations, etc all over the world.

The OK couplings are manufactured in modern NC-controlled equipment utilizing CAD/CAM technology. Our most important resource is, however, a well-trained staff with a long experience and tradition of manufacturing precision engineering products.

SKF Coupling Systems AB was established in the early 1940s when SKF’s Chief Designer, Erland Bratt, invented the SKF oil injection method.

As the result of continuous development, SKF is currently a world leader in selected market niches.

Our business concept is to develop, produce and supply products based on the SKF oil injection method.

These products significantly reduce downtime and lower maintenance costs of the capital-intensive equipment in which they are used.

® SKF is a registered trademark of the SKF Group. © SKF Group 2011 The contents of this catalogue are the copyright of the publisher and may not be reproduced (even extracts) unless permission is granted. Every care has been taken to ensure the accuracy of the information contained in this catalogue 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.

Publication November 2011 Printed in Sweden on environmentally friendly, chlorine-free paper.

2000

SE-813 82 Hofors, Sweden.

Tel: +46 290 284 00. Fax: +46 290 282 70 E-mail: skf.coupling.systems@skf.com Website: www.couplings.skf.com