K608

 

  Material

Material

PTFE+ 40% Bronze + O ring NBR : Brown Color. Code K608B

PTFE+ 40% Bronze + O ring NBR : Green Color. Code K608G

PTFE 15% Glass + O ring NBR

Introduction

K608 is a rod buffer seal. It provides the designer with a compact low friction seal for light to medium duty hydraulic cylinders.

 

This compact rod/gland seal provides optimum sealing performance combined with smooth operation and low levels of breakout and dynamic friction. These features are efficiently achieved by using a PTFE sleeve supported by a rectangular elastomeric energizer.

 

In operation, the rectangular energizer helps to keep leakage to a minimum by evenly supporting the PTFE sleeve,

preventing it from twisting or rocking in the housing. Stable fluid film conditions and consistent low friction values are therefore maintained.

 

In addition, the profile of the PTFE sleeve is designed to control leakage by ensuring that the maximum possible

amount of residual fluid film is recovered from the piston rod on the return stroke. Due to the self-lubricating properties of the running face of the seal, and its single-acting profile, two seals may be fitted in tandem to provide optimum leakage control without the risk of inter-seal pressure trapping.

 

The special PTFE ring has the low frictional properties normally associated with this material but is strengthened by additives to reduce creep. It has a low breakout friction so stick-slip is eliminated.

 

FEATURES

 

Ø  No stick-slip effect when starting for smooth operation

Ø  High wear resistance ensures long sevice life

Ø  Suitable for most hydraulic fluids in relation with most modern hardware materials and surface finish depending on material selected.

Ø  Available for all cylinder diameters up to 2700mm

Ø  Suitable for non lubricating fluids depending on seal material for optimum design flexibility

Ø  High maximum speed

Application

Ø  Hydraulic application

Ø  Cranes

Ø  Steel mill

 

 

Material

Power-transmission fluid

Temperature C

Speed

Pressure

Max. Gap F

PTFE+bronze

Mineral Oil (NBR)

-30  -  +110

≤   15m/s

160 bar

F  ≤   0,6 mm

Mineral Oil (FKM)

-30  -  +220

 

250 bar

F  ≤   0,4 mm

 

 

 

 

 

 

400 bar

F  ≤   0,2 mm

 

Chamfers & Rad

Tolerance

Surface Finishing

(mm)

µm Ra

µm Rt

S  ≤

3.75

5.5

7.5

10.5

12.5

15

ø d1

f8 / h9

0,1-0,4

≤  4

C  ≥

2

3

5

7.5

8

8.5

ø D1

H9

≤  1,6

≤ 10

r1  ≤

0.4

0.8

1.2

1.6

1.6

2.0

L

+0,2      -0

≤  3,2

≤ 16

 

 

              

ø d

ø D

H

 

ø d

ø D

H

 

ø d

ø D

H

6

10.9

2.2

 

70

85.1

6.3

 

230

250.5

8.1

7

11.9

2.2

 

70

90.5

8.1

 

235

255.5

8.1

8

12.9

2.2

 

72

82.7

4.2

 

240

260.5

8.1

8

15.3

3.2

 

73

88.1

6.3

 

245

265.5

8.1

9

13.9

2.2

 

75

85.7

4.2

 

250

270.5

8.1

9

16.3

3.2

 

75

90.1

6.3

 

260

284

8.1

10

14.9

2.2

 

76.2

91.3

6.3

 

265

289

8.1

10

17.3

3.2

 

78

93.1

6.3

 

270

290.5

8.1

12

16.9

2.2

 

80

90.7

4.2

 

270

294

8.1

12

19.3

3.2

 

80

95.1

6.3

 

275

299

8.1

12.7

17.6

2.2

 

80

100.5

8.1

 

280

304

8.1

12.7

20.1

3.2

 

82.5

97.6

6.3

 

285

309

8.1

14

8.9

2.2

 

83

93.7

4.2

 

290

314

8.1

14

21.3

3.2

 

85

95.7

4.2

 

295

319

8.1

15

19.9

2.2

 

85

100.1

6.3

 

300

320.5

8.1

15

22.3

3.2

 

85

105.5

8.1

 

300

324

8.1

16

20

2.2

 

89

104.1

6.3

 

310

334

8.1

16

23.3

3.2

 

90

100.7

4.2

 

320

344

8.1

17

21.9

2.2

 

90

105.1

6.3

 

330

354

8.1

18

22.9

2.2

 

90

110.5

8.1

 

340

364

8.1

18

25.3

3.2

 

92

102.7

4.2

 

350

370.5

8.1

19

29.7

4.2

 

92

107.1

6.3

 

350

374

8.1

20

27.3

3.2

 

95

105.7

4.2

 

360

384

8.1

20

30.7

4.2

 

95

110.1

6.3

 

365

389

8.1

22

29.3

3.2

 

100

110.7

4.2

 

370

394

8.1

22

32.7

4.2

 

100

115.1

6.3

 

375

399

8.1

24

31.3

3.2

 

100

120.5

8.1

 

380

404

8.1

25

32.3

3.2

 

101.6

116.7

6.3

 

390

414

8.1

25

35.7

4.2

 

104.7

119.8

6.3

 

400

424

8.1

25.4

32.7

3.2

 

105

120.1

6.3

 

410

434

8.1

25.4

36.1

4.2

 

105

125.5

8.1

 

420

444

8.1

26

33.3

3.2

 

110

120.7

4.2

 

430

454

8.1

26

36.7

4.2

 

110

125.1

6.3

 

435

459

8.1

28

35.3

3.2

 

110

130.5

8.1

 

440

464

8.1

28

38.7

4.2

 

115

130.1

6.3

 

450

474

8.1

28.58

35.88

3.2

 

120

135.1

6.3

 

460

484

8.1

30

37.3

3.2

 

120

145.5

8.1

 

470

494

8.1

30

40.7

4.2

 

125

140.1

6.3

 

480

504

8.1

32

39.3

3.2

 

125

145.5

8.1

 

485

509

8.1

32

42.7

4.2

 

125.4

140.5

6.3

 

490

514

8.1

35

42.3

3.2

 

127

142.1

6.3

 

500

524

8.1

35

45.7

4.2

 

130

145.1

6.3

 

510

534

8.1

36

43.3

3.2

 

130

150.5

8.1

 

520

544

8.1

36

46.7

4.2

 

132

147.1

6.3

 

525

549

8.1

37

44.3

3.2

 

135

145.7

4.2

 

530

554

8.1

37

47.7

4.2

 

135

150.1

6.3

 

540

564

8.1

38

48.7

4.2

 

137

152.1

6.3

 

550

574

8.1

38

53.1

6.3

 

138

153.1

6.3

 

560

584

8.1

40

50.7

4.2

 

140

150.7

4.2

 

570

594

8.1

40

55.1

6.3

 

140

155.1

6.3

 

580

604

8.1

42

52.7

4.2

 

140

160.5

8.1

 

585

609

8.1

42

57.1

6.3

 

140.5

155.6

6.3

 

590

614

8.1

43

53.7

4.2

 

145

160.1

6.3

 

600

624

8.1

44.45

59.55

6.3

 

145

165.5

8.1

 

610

634

8.1

45

55.7

4.2

 

150

165.1

6.3

 

620

644

8.1

45

60.1

6.3

 

150

170.5

8.1

 

630

654

8.1

48

58.7

4.2

 

153

168.1

6.3

 

640

664

8.1

48

63.1

6.3

 

155

170.1

6.3

 

650

677.3

9.5

50

60.7

4.2

 

160

175.1

6.3

 

656

683.3

9.5

50

65.1

6.3

 

160

180.5

8.1

 

660

687.3

9.5

50.8

61.5

4.2

 

165

180.1

6.3

 

680

707.3

9.5

50.8

65.9

6.3

 

170

185.1

6.3

 

685

712.3

9.5

52

62.7

4.2

 

170

190.5

8.1

 

700

724

8.1

52

67.1

6.3

 

173

188.1

6.3

 

700

727.3

9.5

54

69.1

6.3

 

175

190.1

6.3

 

710

737.3

9.5

55

65.7

4.2

 

180

195.1

6.3

 

730

757.3

9.5

55

70.1

6.3

 

180

200.5