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 ⁰C
|
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
|
8.1
|
|
760
|
787.3
|
9.5
|
|
56
|
66.7
|
4.2
|
|
185
|
200.1
|
6.3
|
|
765
|
792.3
|
9.5
|
|
56
|
71.1
|
6.3
|
|
185
|
205.5
|
8.1
|
|
780
|
807.3
|
9.5
|
|
56
|
76.5
|
8.1
|
|
190
|
205.1
|
6.3
|
|
790
|
817.3
|
9.5
|
|
57
|
72.1
|
6.3
|
|
190
|
210.5
|
8.1
|
|
800
|
827.3
|
9.5
|
|
59
|
69.7
|
4.2
|
|
195
|
210.1
|
6.3
|
|
810
|
837.3
|
9.5
|
|
60
|
70.7
|
4.2
|
|
200
|
215.1
|
6.3
|
|
820
|
847.3
|
9.5
|
|
60
|
75.1
|
6.3
|
|
200
|
220.5
|
8.1
|
|
830
|
857.3
|
9.5
|
|
63
|
73.7
|
4.2
|
|
205
|
225.5
|
8.1
|
|
850
|
877.3
|
9.5
|
|
63
|
78.1
|
6.3
|
|
210
|
230.5
|
8.1
|
|
870
|
897.3
|
9.5
|
|
63.5
|
78.6
|
6.3
|
|
211
|
231.5
|
8.1
|
|
880
|
907.3
|
9.5
|
|
65
|
75.7
|
4.2
|
|
212
|
232.5
|
8.1
|
|
885
|
912.3
|
9.5
|
|
65
|
80.1
|
6.3
|
|
215
|
235.5
|
8.1
|
|
890
|
917.3
|
9.5
|
|
67
|
77.7
|
4.2
|
|
220
|
240.5
|
8.1
|
|
930
|
957.3
|
9.5
|
|
69
|
84.1
|
6.3
|
|
225
|
245.5
|
8.1
|
|
955
|
982.3
|
9.5
|
|
70
|
80.7
|
4.2
|
|
230
|
245.1
|
6.3
|
|
|
|
|