The Kop-Flex® KD® coupling product line was designed for pump, screw and reciprocating compressor applications. These high-value disc couplings are manufactured to finishes typically found on higher-cost offerings, providing simplified maintenance and best in class performance. The superior KS coupling product line is balanced to tighter tolerances for higher operating speeds and meets API 671 specifications
For over 30 years our High-Performance products have been the standard for reliability and performance. Our KD® and KS product lines use similar disc pack geometry and benefit from our experience in gas turbine and centrifugal compressor applications.
Kop-Flex® also offers resilient coupling designs which can be torsionally soft to isolate damaging vibratory torques or provide damping to minimize severe oscillations due to peak torques. The Max-C® replaceable rubber elements are available in various durometers in order to tune drivetrains away from damaging resonant frequencies.
Talk to one of our expert sales professionals about how our solutions can efficiently power your business.
The KD® product line provides great value. The feature-packed KD20, KD21, and KD23 all come standard with the following:
Features
Fully Machined Construction
Scalloped Disc Profile
Stainless Steel Unitized Disc Pack
As Machined AGMA Class 9 Balance
Forged Steel Components
Benefits
Improves dynamic balance compared to cast components
Optimize stress distribution and reduces reaction loads
Higher strength and facilitates replacement of the flex element
Allows for higher operating speeds, Class 10 optional
Allows for smaller, lower weight couplings
These factors combine to provide “best in class” torque capacity by size, allowing for the most power-dense coupling selection to be made.
KD® PRODUCT LINE OVERVIEW OPTIONAL FEATURES INCLUDE:
Torsionally Tuned Spacer
By machining a forging instead of using off the shelf cast components. The stiffness of the spacer can be adjusted to torsionally tune the coupling.
Shrink Disc Mounting
By incorporating a shrink disc mounted on the hub body the coupling can be installed or removed without heating the hubs.
Keyless Tapered Bushing
By using a tapered bushing, interference fit hubs can easily be removed through the use of hydraulic fittings and equipment.
KOP-FLEX® KD2®/KD20 COUPLINGS
The KD2® and KD20 are user-friendly spacer couplings designed to meet API 610 / ISO 13709. The medium-duty KD2® and the heavy-duty KD20 are for applications requiring moderate shaft separations. Installation and maintenance are simplified by the use of only three main parts: two hubs and a factory assembled center section.
Drop-out spacer style
Fully machined steel construction
AGMA Class 9 Balance standard
AGMA Class 10 or 11 Balance optional
Many sizes available to fit your application
Standard shaft separations for industrial applications
Many typical center section lengths stocked
For higher speed applications consider a KS coupling
SIZE
MAXIMUM BORE (in)
TORQUE RATINGS (in-lb)
RATED
SPEED
(RPM)
MISALIGNMENT RATINGS
TORSIONAL STIFFNESS (in-lb/rad x109)
KEYED
STANDARD/LONG
HUB
KEYLESS
STANDARD,/LONG
HUB
(ALLOY)
KEYED
JUMBO HUB
MAX.
CONTINUOUS
PEAK
AXIAL
(in)
ANGULAR
(deg)
k
TOTAL
k
SPACER PER
INCH
KD2
103
1.88
2.00
2.75
2710
5420
7200
± 0.038
0.25
1
18
153
2.88
3.12
4.00
7880
15760
6000
± 0.067
0.33
2
43
203
3.25
3.63
4.62
14400
28800
4800
± 0.090
0.33
4
68
KD20
204
3.25
3.62
4.62
54000
72000
4800
± 0.032
0.25
4
110
254
4.00
4.38
5.62
78000
104000
4200
± 0.060
0.25
6
180
304
4.75
5.12
6.50
133500
178000
3600
± 0.047
0.33
11
360
354
5.50
5.88
7.62
225000
300000
3600
± 0.063
0.33
18
690
404
6.25
6.88
8.75
322500
430000
3000
± 0.063
0.33
25
1050
454
7.25
7.75
9.38
383000
510000
3000
± 0.160
0.33
32
1500
504
7.50
8.00
-
540000
720000
2400
± 0.067
0.33
43
2500
554
8.25
8.75
-
758000
1010000
1800
± 1.068
0.33
59
3600
604
9.00
9.75
-
990000
1320000
1800
± 0.078
0.33
78
4700
705
10.88
11.62
-
2265000
3020000
1800
± 0.097
0.20
180
14000
805
12.25
13.12
-
3465000
4620000
1800
± 0.135
0.20
270
21000
905
13.50
14.50
-
3900000
5200000
1800
± 0.228
0.25
330
31000
Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
Standard keyed bores per ANSI/AGMA 9002. Contact Kop-Flex for other fit requirements.
Max. bore for allay keyless hubs is given for reference only. Contact Kop-Flex Engineering with specific requirements.
Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
Standard keyed bores per ANSI/AGMA 9002. Contact Kop-Flex for other fit requirements.
Max. bore for allay keyless hubs is given for reference only. Contact Kop-Flex Engineering with specific requirements.
SIZE
DIMENSIONS (in)
WEIGHT - COMPONENT (lb)
INERTIA - COMPONENT (lb-in2)
A
TYPICAL C
E
E1
G
STANDARD HUB “E”
TYPICAL
LENGTH
CENTER
ASSY
LONG
HUB
“E1”
JUMBO
HUB
“E1”
SPACER PER INCH
STANDARD HUB “E”
TYPICAL LENGTH CENTER ASSY
LONG HUB “E1”
JUMBO HUB “E1”
SPACER PER INCH
KD2
103
4.31
5.00
1.50
2.50
2.62
1.7
7.4
2.5
5.9
0.4
3.4
16
4.5
19
0.5
153
5.69
5.00
2.00
3.12
4.12
4.3
15
6.9
11
0.5
16
60
24
67
1.1
203
6.75
5.00
2.25
3.62
4.75
7.9
21
12
19
0.6
41
130
56
160
1.7
KD20
204
6.62
7.00
2.25
3.62
4.75
7.4
28
11.0
17.0
0.8
37
170
52
140.0
2.7
254
7.88
7.00
2.88
4.25
5.75
13
36
18
27
0.8
95
320
130
320
4.4
304
9.25
9.00
3.38
4.75
6.75
21
64
28
43
1.3
210
780
270
690
8.9
354
10.75
9.00
.00
5.38
7.75
32
104
41
65
2.0
430
1700
430
1400
17
404
12.00
12.00
4.44
6.12
9.00
49
155
65
85
2.4
850
3200
1100
2300
26
454
13.00
12.00
4.81
6.75
10.12
62
175
83
114
2.5
1300
4350
1750
3700
37
504
14.12
12.00
6.88
-
10.50
96
226
-
-
3.7
2250
6700
-
-
63
554
15.38
14.00
7.50
-
11.50
123
317
-
-
4.8
3400
11000
-
-
90
604
16.88
14.00
8.75
-
12.75
181
403
-
-
5.2
6100
16500
-
-
115
705
20.88
18.00
9.75
-
15.25
289
799
-
-
11
14000
49000
-
-
350
805
23.38
20.00
10.75
-
17.25
409
1410
-
-
13
26000
111000
-
-
500
905
25.88
20.00
11.75
-
19.00
538
1550
-
-
14
41000
157000
-
-
770
Additional standard center assembly lengths are available as stock items. Custom lengths are also available, contact Kop-Flex for more information.
Weight and Inertia are based on max. bore keyed standard hub, Hub Length "E” and Typical “C” Dimensions.
Torsional stiffness is based on 1/3 shaft penetration method, max bore keyed standard hub. Hub Length “E" and Typical "C" Dimensions.
Additional standard center assembly lengths are available as stock items. Custom lengths are also available, contact Kop-Flex for more information.
Weight and Inertia are based on max. bore keyed standard hub, Hub Length "E” and Typical “C” Dimensions.
Torsional stiffness is based on 1/3 shaft penetration method, max bore keyed standard hub. Hub Length “E" and Typical "C" Dimensions.
KOP-FLEX® KD21 COUPLINGS
The KD21 is an economical spacer coupling designed for pump applications. The unitized disc packs and close tolerance bolts provide good dynamic balance. The minimal number of components creates an economical disc coupling solution.
Economical spacer style
Fully machined steel construction
AGMA Class 9 Balance standard
AGMA Class 10 Balance optional
Many sizes available to fit your application
Standard shaft separations for industrial applications
Many typical spacer lengths stocked
For higher speed, applications consider a KS coupling
SIZE
MAXIMUM
BORE
(in)
TORQUE
RATINGS
(in-lb)
PEAK
RATED
SPEED
(RPM)
MISALIGNMENT RATINGS
TORSIONAL
STIFFNESS
(in-lb/rad x104)
KEYED
HUB
KEYLESS
HUB (ALLOY)
MAX.
CONTINUOUS
AXIAL
(in)
ANGULAR
(deg)
k TOTAL
k SPACER
PER INCH
204
3.00
3.25
54000
72000
4800
± 0.032
0.25
4
110
254
3.75
4.00
78003
104000
4200
± 0.060
0.25
6
180
304
4.50
4.75
133500
178000
3600
± 0.047
0.33
11
360
354
5.00
5.38
225000
300000
3600
± 0.063
0.33
18
690
404
5.50
6.13
322500
430000
3000
± 0.063
0.33
26
1050
454
6.38
6.88
383000
510000
3000
± 0 160
0.33
33
1500
504
7.00
7.50
540000
720000
2400
± 0.067
0.33
44
2500
554
7.75
8.13
758000
1010000
1800
± 0.068
0.33
60
3600
604
8.50
8.75
990000
1320000
1800
± 0.078
0.33
78
4700
705
10.75
10.88
2265000
3020000
1800
± 0.097
0.20
190
14000
805
12.00
12.13
3465000
4620000
1800
± 0.135
0.20
270
21000
905
13.50
13.75
3900000
5200000
1800
± 0.228
0.25
340
31000
Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
Standard keyed bores per ANSI/AGMA 9002. Contact Kop-Flex for other lit requirements.
Max bore for alloy keyless hubs is given for reference only. Contact Kip-Flex Engineering with specific requirements.
Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
Standard keyed bores per ANSI/AGMA 9002. Contact Kop-Flex for other lit requirements.
Max bore for alloy keyless hubs is given for reference only. Contact Kip-Flex Engineering with specific requirements.
SIZE
DIMENSIONS (in)
WEIGHT - COMPONENT (lb)
INERTIA - COMPONENT (lb-in2)
A
TYPICAL
C
E
E1
G
STANDARD
HUB “E”
DRIVE DISC
PACK AND
FASTENERS
TYPICAL
LENGTH
SPACER
DRIVEN
DISC
PACK AND
FASTENERS
LONG
HUB
“E1”
SPACER
PER
INCH
STANDARD
HUB “E”
DRIVE DISC
PACK AND
FASTENERS
TYPICAL
LENGTH
SPACER
DRIVEN
DISC
PACK AND
FASTENERS
LONG
HUB
“E”
SPACER
PER
INCH
204
6.38
7.00
2.38
3.03
4.32
73
3.1
10
3.1
8.7
0.8
34
20
55
20
39
2.7
254
7.62
7.00
3.00
3.59
5.34
13
3.5
12
3.5
14
0.8
84
32
100
32
94
4.4
304
9.00
7.00
3.56
4.19
6.16
19
6.3
20
6.3
22
1.3
180
79
230
79
200
8.9
354
10.50
7.00
4.12
4.75
6.99
31
11
32
11
34
2.0
380
180
500
180
410
17
404
11.75
8.00
4.62
5.31
7.91
46
17
48
17
51
2.4
720
370
940
370
780
26
454
12.75
8.00
5.25
6.03
8.83
57
19
50
19
64
2.5
1100
470
1200
470
1200
37
504
13.88
10.00
5.88
-
9.62
75
26
73
26
-
3.7
1700
800
2000
800
-
63
554
15.12
10.00
7.16
-
10.48
103
39
97
39
-
4.8
2700
1400
3100
1400
-
90
604
16.50
12.00
7.66
-
11.33
127
50
128
50
-
5.2
4000
2200
4800
2200
-
115
705
20.50
12.00
9.00
-
14.07
220
101
243
101
-
11
11000
6700
13500
6700
-
350
805
23.00
16.00
10.12
-
15.73
312
176
361
176
-
13
19500
15000
25000
15000
-
500
905
25.50
16.00
11.81
-
17.88
463
174
436
174
-
14
35500
18000
40000
18000
-
770
Additional standard center assembly lengths are available as stock items. Custom lengths are also available, contact Kop-Flex for more information
Weight and Inertia are based on max. bore keyed hub, Hub Length "E" and “Typical "C” Dimensions.
Torsional stiffness is based on 1/3 shaft penetration method, max bore keyed hub. Hub Length "E" and Typical "C" Dimensions.
Additional standard center assembly lengths are available as stock items. Custom lengths are also available, contact Kop-Flex for more information
Weight and Inertia are based on max. bore keyed hub, Hub Length "E" and “Typical "C” Dimensions.
Torsional stiffness is based on 1/3 shaft penetration method, max bore keyed hub. Hub Length "E" and Typical "C" Dimensions.
KOP-FLEX® KD23 COUPLINGS
The KD23 is a flywheel style coupling, designed for use on reciprocating equipment. The machined plate adapter is designed to connect to standard SAE flywheels.
Flywheel style
Fully machined steel construction
AGMA Class 9 Balance standard
Torque ratings optimized for compression industry
Many sizes available to fit your application
SIZE
SALES
FLY-
WHEEL
MAXIMUM BORE
(in)
TORQUE RATINGS
(in-lb)
RATED
SPEED
(RPM)
MISALIGNMENT
RATINGS
DIMENSIONS (in)
TORSIONAL
STIMIESS
(in-lb/rad)
KEYED
HUB
KEYLESS
HUB
(ALLOY)
MAXIMUM
CONTINUOUS
PEAK
AXIAL
(in)
ANGULAR
100
A
TYPICAL
C
E
E1
G
FW
k
TOTAL
k SPACER
PER INCH
204
8
3.00
3.25
54000
72000
4800
±0.032
0.25
6.38
9.00
2.38
3.03
4.32
10.375
4
110
254
8
3.75
4.00
78000
104000
4200
±0.060
0.25
7.62
9.00
3.00
3.59
5.34
10.375
6
180
254
10
3.75
4.00
78000
104000
4200
±0.060
0.25
7.62
9.00
3.00
3.59
5.34
12.375
6
180
304
10
4.50
4.75
133500
178000
3600
±0.047
0.33
9.00
9.00
3.56
4.19
6.16
12.375
12
360
304
11 1/2
4.50
4.75
133500
178000
3600
±0.047
0.33
9.00
9.00
3.56
4.19
6.16
13.875
11
360
354
11 1/2
5.00
5.38
225000
300000
3600
±0.063
0.33
10.50
9.00
4.12
4.75
6.99
13.875
18
690
354
14
5.00
6.38
225000
300000
3600
±0.063
0.33
10.50
9.00
4.12
4.75
6.99
18.375
18
690
404
11 1/2
5.50
6.13
322500
430000
3000
±0.063
0.33
11.75
10.00
4.62
5.31
7.91
13.275
27
1050
404
14
5.50
6.13
322500
430000
3000
±0.063
0.33
11.75
10.00
4.62
5.31
7.91
18.375
27
1050
404
18
5.50
6.13
322500
430000
3000
±0.063
0.33
11.75
10.00
4.62
5.31
7.91
22.500
27
1050
454
14
6.38
6.88
383000
510000
3000
±0.160
0.33
12.75
10.00
5.25
6.03
8.83
18.375
34
1500
454
18
6.38
6.88
383000
510000
3000
±0.160
0.33
12.75
10.00
5.25
6.03
8.83
22.500
34
1500
504
14
7.00
7.50
540000
720000
2400
±0.067
0.33
13.88
12.00
5.88
-
9.62
18.375
47
2500
504
18
7.00
7.50
540000
720000
2400
±0.067
0.33
13.88
12.00
5.88
-
9.62
22.500
47
2500
504
21
7.00
7.50
540000
720000
2400
±0.067
0.33
13.88
12.00
5.88
-
9.62
26.500
47
2500
554
14
7.75
8.13
758000
1010000
1800
±0.068
0.33
15.12
13.00
7.16
-
10.48
18.375
63
3600
554
18
7.75
8.13
758000
1010000
1800
±0.068
0.33
15.12
13.00
7.16
-
10.48
22.500
63
3600
554
21
7.75
8.13
758000
1010000
1800
±0.068
0.33
15.12
13.00
7.16
-
10.48
26.500
63
3600
554
24
7.75
8.13
758000
1010000
1800
±0.068
0.33
15.12
13.00
7.16
-
10.48
28.875
63
3600
604
18
8.50
8.75
990000
1320000
1800
±0.078
0.33
16.50
15.00
7.66
-
11.33
22.600
82
4700
604
21
8.50
8.75
990000
1320000
1800
±0.078
0.33
16.50
15.00
7.66
-
11.33
26.500
82
4700
604
24
8.50
8.75
990000
1320000
1800
±0.078
0.33
16.50
15.00
7.66
-
11.33
28.875
82
4700
705
21
10.75
10.88
2265000
3020000
1800
±0.097
0.20
20.50
18.00
9.00
-
14.07
26.500
190
14000
705
24
10.75
10.88
2265000
3020000
1800
±0.097
0.20
20.50
18.00
9.00
-
14.07
28.875
190
14000
805
24
12.00
12.13
3465000
4620000
1800
±0.135
0.20
23.00
20.00
10.12
-
15.73
28.875
280
21000
905
24
13.50
13.75
3900000
5200000
1800
±0.228
0.25
25.50
20.00
11.81
-
17.88
28.875
360
31000
Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
Standard keyed bores per ANSI/ALMA 9002. Contact Kop-Flex for other fit requirements.
Max. bore for alloy keyless hubs is given for reference only. Contact Kop-Flex Engineering with specific requirements.
Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
Standard keyed bores per ANSI/ALMA 9002. Contact Kop-Flex for other fit requirements.
Max. bore for alloy keyless hubs is given for reference only. Contact Kop-Flex Engineering with specific requirements.
SIZE
WEIGHT - COMPONENT (lb)
INERTIA – COMPONENT (lb-in2)
DRIVEN
HUB
“E”
DRIVEN
HUB
“E1”
DRIVE DISC
PACK AND
FASTENERS
TYPICAL
LENGTH
SPACER
DRIVEN DISC
PACK AND
FASTENERS
FLYWHEEL
ADAPTER
SPACER
PER INCH
DRIVEN
HUB
“E”
DRIVEN
HUB
“E1”
DRIVE DISC
PACK AND
FASTENERS
TYPICAL
LENGTH
SPACER
DRIVEN DISC
PACK AND
FASTENERS
FLYWHEEL
ADAPTER
SPACER
PER INCH
204
7.3
8.7
3.1
11
3.1
15
0.8
34
39
20
57
20
240
2.7
254
13
14
3.5
13
3.5
14
0.8
84
94
32
105
32
210
4.4
254
13
14
3.5
13
3.5
23
0.8
84
94
32
105
32
530
4.4
304
19
22
6.3
21
6.3
22
1.3
180
200
79
230
79
520
8.9
304
19
22
6.3
21
6.3
32
1.3
180
200
79
230
79
930
8.9
354
31
34
11
33
11
33
2.0
380
410
180
510
180
880
17
354
31
34
11
33
11
75
2.0
380
410
180
510
180
3700
17
404
46
51
17
48
17
32
2.4
720
780
370
950
370
840
26
404
46
51
17
48
17
77
2.4
720
780
370
950
370
3900
26
404
46
51
17
48
17
140
2.4
720
780
370
950
370
10000
26
454
57
64
19
51
19
70
2.5
1100
1200
470
1200
470
3700
37
454
57
64
19
51
19
133
2.5
1100
1200
470
1200
470
10000
37
504
75
-
26
74
26
73
3.7
1700
-
800
2000
800
3500
63
504
75
-
26
74
26
134
3.7
1700
-
800
2000
800
10000
63
504
75
-
26
74
26
206
3.7
1700
-
800
2000
800
22000
63
554
103
-
39
100
39
74
4.8
2700
-
1400
3100
1400
3400
90
554
103
-
39
100
39
141
4.8
2700
-
1400
3100
1400
11000
90
554
103
-
39
100
39
227
4.8
2700
-
1400
3100
1400
24000
90
554
103
-
39
100
39
294
4.8
2700
-
1400
3100
1400
36000
90
604
127
-
50
132
50
135
5.2
4000
-
2200
4900
2200
11000
115
604
127
-
50
132
50
225
5.2
4000
-
2200
4900
2200
24000
115
604
127
-
50
132
50
295
5.2
4000
-
2200
4900
2200
36000
115
705
220
-
101
279
101
236
11
11000
-
6700
15000
6700
22000
350
705
220
-
101
279
101
282
11
11000
-
6700
15000
6700
36000
350
805
312
-
176
371
176
301
13
19500
-
15000
25000
15000
34000
500
905
463
-
174
446
174
266
14
35500
-
18000
40000
18000
31000
770
Weight and Inertia are based on max bore keyed hub. Hub Length "E" and Typical “C” Dimensions.
Torsional stifness is based on 1/3 shaft penetration method, max bore keyed hub. Hub Length "E" and Typical “C” Dimensions
Weight and Inertia are based on max bore keyed hub. Hub Length "E" and Typical “C” Dimensions.
Torsional stiffness is based on 1/3 shaft penetration method, max bore keyed hub. Hub Length "E" and Typical “C” Dimensions
>
KOP-FLEX® MAX-C® CB COUPLINGS
The Max-C® CB is a resilient coupling used on reciprocating equipment to isolate damaging vibratory torques from connected equipment. Contact Kop-Flex® Engineering with specific application information so a custom-engineered and torsionally tuned Max-C® can be designed to your requirements.
Torsionally soft
Rubber block in cylindrical shape
Various durometers available
Custom engineered for applications
Maintenance free operation
Hybrid designs are available with disc, gear or diaphragm flex elements
For applications requiring a higher degree of torsional stiffness, consider a Max-C® WB. Contact Kop-Flex® Engineering for details
SIZE
④
MAX
BORE
OF FLEX
HUB
(in)
PEAK
CAPACITY
(HP/100 RPM)
PEAK
TORQUE
(in-lbx102)
③
VIBRATORY
TORQUE
(in-lb x 102)
⑥
MAX.
SPEED
(RPM)
NUMBER
OF
CAVITIES
②
NUMBER
OF
BLOCKS
DIMENSIONS (in)
BOLTS -
No. &
DIA
(in)
BOLTS -
No. &
DIA
(in)
A
B
C
D
E
E1
F
G
K ①
0
T
H
J
1.5
1.75
7
4.41
.55
6900
10
10
.625
4.407
0.0938
5.00
2.156
2.156
4.75
5.875
2.75
2.625
0.75
8–0.375
5–0.25
2
2.125
12
7.56
.95
5900
10
10
7.75
4.906
0.0938
6.125
2.406
2.406
5.75
7.00
300
3.219
0.75
8–0.375
5–0.313
2
2.625
22
13.86
.55
4800
10
10
9.50
5.375
0.125
7.875
2.625
2.625
6.75
8.75
3.25
3.969
0.75
10–0.375
5–0.375
3
3.188
40
25.2
3.15
4100
10
10
11.125
6.625
0.125
9.50
3.25
3.25
7.75
10.375
4.25
4.875
0.75
10–0.375
5–0.438
3.5
3.813
70
44.1
5.51
3600
10
10
13.25
7.875
0.125
11.25
3.875
3.875
10.125
12.25
4.75
5.875
0.75
10–0.50
5–0.50
4
4.625
120
75.6
9.45
3000
10
10
15.75
9.25
0.125
13.625
4.563
4.563
10.75
14.75
5.75
7.188
0.75
10–0.50
5–0.625
5
5.625
220
138.6
17.33
2400
10
10
19.125
11.375
0.125
16.50
5.625
5.583
10.00
17.875
7.25
8.781
0.875
10–0.625
5–0.75
6
6.875
400
252
31.5
1950
10
10
23.50
13.125
0.188
20.25
6.813
6.125
12.00
22.00
8.75
10.625
1.125
10–0.75
6–0.875
7
7.813
600
378
47.25
1760
10
10
26.125
15.938
0.188
22.875
7.875
7.875
14.00
24.625
10.25
12.125
1.5
12–0.75
5–0.875
8
8.625
800
504
63.0
1600
10
10
29.00
16.938
0.188
25.375
8.375
8.375
15.25
27.25
11.00
13.563
1.125
16–0.875
5–1.00
9
9.875
1200
756
94.5
1400
10
10
33.00
19.313
0.188
29.00
9.563
9.563
17.625
31.00
12.75
15.438
1.375
16–1.00
5–1.125
10
10.875
1600
1008
123.5
1265
10
10
36.25
21.75
0.25
31.50
10.75
10.75
19.25
34.00
14.00
16.813
1.438
16–1.125
5–1.25
12
12.125
2200
1386
173.3
1150
10
10
40.00
24.00
0.25
36.125
11.875
11.875
21.625
37.50
15.75
18.719
1.75
16–1.25
5–1.50
13
13.50
3000
1890
236.3
1110
12
24
41.50
28.188
0.313
36.00
13.938
13.938
24.00
39.00
9.75
21.031
1.75
20–1.25
6–1.25
14
14.75
4000
2520
315.0
1030
12
24
44.50
31.75
0.375
39.375
15.688
15.688
26.00
42.0O
11.00
22.906
1.75
20–1.25
8–1.50
16
16.875
6000
3780
472.5
960
16
32
48.00
36.375
0.375
41.625
18.00
18.00
29.625
45.00
13.00
27.625
2.00
20–1.50
9–1.125
① Space needed for block removal
② Number of blocks employed is shown in Tables No. 1 and 2
③ Vibratory torque values tabulated relate to vibration frequencies up to 500 vib/min. For higher frequencies, coupling vibratory torque capacity is derated on the following
① Space needed for block removal
② Number of blocks employed is shown in Tables No. 1 and 2
③ Vibratory torque values tabulated relate to vibration frequencies up to 500 vib/min. For higher frequencies, coupling vibratory torque capacity is derated on the following
Where
T = Vibratory torque capacity (lb. in.) at frequency F (vib/min.).
TF = Vibratory torque (lb. in.) from table.
F = Frequency (vib/min.) at which torque capacity is required.
SIZE
⑤ INERTIA W/NO BORES (lb-n2 x 103)
⑤ FINISHED WEIGHT W/ NO BORES (lb)
HUB
RESILLIENT
BLOCKS
SLEEVE &
END RING
RIGID HALF
⑤
TOTAL
HUB
RESILLIENT
BLOCKS
SLEEVE &
END RING
RIGID HALF
⑤
TOTAL
1.5
.006
.002
.043
.061
.112
4.4
.47
6.6
14
25.5
2
.013
.004
.086
.126
.229
7.1
.84
10
22
40
2.5
.036
.014
.194
.280
.524
12
1.7
12
34
61.7
3
.091
.037
.481
.572
1.181
22
3
25
54
104
3.5
.223
.089
1.032
1.566
2.910
37
5
38
101
181
4
.577
.222
2.480
2.715
5.994
64
9
64
140
277
5
1.579
.592
5.460
5.545
13.176
117
15
92
198
422
6
4.200
1.627
18.111
12.30
36.24
211
28
210
290
739
7
7.464
3.084
30.39
19.80
60.74
285
42
274
437
1038
8
12.35
5.109
47.31
39.28
104.1
378
56
353
647
1434
9
23.48
9.820
95.76
74.56
203.6
562
83
531
967
2143
10
37.64
15.99
150.2
120.1
323.9
761
113
702
1286
2862
12
63.45
26.96
240.1
206.2
535.6
1036
154
963
1773
3926
13
106.9
39.57
297.3
276.9
720.7
1524
200
1064
2300
5088
14
167.9
55.06
458.5
410.2
1092
2000
234
1361
2978
6573
16
336.1
75.48
516.2
674.5
1602
3063
258
1327
4157
8805
④ A reduction in maximum bore is required for limited end float couplings, please consult Kop-flex.
⑤ Weight and WR3 values are based on ductile iron hubs and sleeves, and steel forged rigids and end rings.
⑥ Max. speeds based on ductile iron. Greater speeds allayed for forged steel.
④ A reduction in the maximum bore is required for limited end float couplings, please consult Kop-flex.
⑤ Weight and WR3 values are based on ductile iron hubs and sleeves, and steel forged rigid and end rings.
⑥ Max. speeds based on ductile iron. Greater speeds allayed for forged steel.
KOP-FLEX® ELASTOMERIC® COUPLINGS
A proven and unique concept for a non-lubricated “maintenance free” flexible coupling. The Elastomeric® provides long service life for the coupling, and equipment bearings and seals. The design concept provides low-cost power transmission with the added benefits of absorbing shock loads and damping damaging vibrations.
Cushions the shock of impact loading
Dampens torsional vibrations
Rubber in compression increases torque capacity over shear
Torsionally soft
Dynamically stable
Split insert facilitates installation
SIZE
COUPLING RATING (1)
HP/100 RPM
TORQUE RATING
MAX SPEED
(RPM)(3)
STATIC TORSIONAL
STIFFNESS
(lb-in/rad)
MAXIMUM OFFSET
MISALIGNMENT
RATINGS
(in)
MAXIMUM AXIAL
MISALIGNMENT
RATINGS
(in)
CONTINUOUS DUTY
(in-lb)
PEAK LOAD
(in-lb)(2)
20
0.334
217
630
4100
3180
0.029
±.013
30
0.664
418
1245
4100
7460
0.032
±.017
40
1.15
725
2100
4100
11800
0.034
±.019
50
2.00
1260
3630
4100
21600
0.036
±.023
60
3.05
1920
5700
4100
42800
0.038
±.026
70
7.20
4540
13350
3600
97000
0.042
±.030
80
13.0
8190
24270
>2800
186000
0.056
±.036
90
22.6
14200
42300
2000
284000
0.079
±.046
100
42.0
26500
78600
1800
557000
0.086
±.052
If actual maximum torque loads are known, do not use Service Factors but rather select coupling size under "Torque Rating" in Table I. These figures are those which the coupling is capable of transmitting under continuous operation and normal alignment so as to be consistent with reasonable industnal service life.
For infrequently applied loads not to exceed once per hour.
For higher speeds, refer to Kop-Flex.
If actual maximum torque loads are known, do not use Service Factors but rather select coupling size under "Torque Rating" in Table I. These figures are those which the coupling is capable of transmitting under continuous operation and normal alignment so as to be consistent with reasonable industrial service life.
For infrequently applied loads not to exceed once per hour.
For higher speeds, refer to Kop-Flex.
SIZE
DIMENSIONS (in)
WIDE MOUNT
CLOSE MOUNT
BORE WITH
STANDARD
KEYWAY
STOCK
ROUGH
BORE
HUB
SEP.
L
SHAFT
SEPARATION
C
0A
B
D
E
F
00
OR
SIZE
HUB &
SHAFT
SEPARATION
L
B
MAX.
MIN.
MIN.
MAX.
20
1.125
0.50
0.375
1
0.125
1
3.688
3.125
0.125
1.063
0.625
1.875
4
20
0.125
2.50
30
1.50
0.50
0.375
1.50
0.125
1.50
4.375
4.125
0.125
1.313
0.625
2.438
4.625
30
0.125
2.75
40
1.875
0.50
0.375
1.625
0.125
1.625
5.375
5.125
0.125
1.75
1
2.75
5.688
40
0.125
3.625
*50
2.125
0.75
0.625
2.125
0.125
2.125
6.063
6.125
0.125
2
1
3.125
6.75
50
0.125
4.125
* 60
2.875
1.125
0.938
2.125
0.125
2.125
7
6.125
0.125
2
1
4.219
7.625
60
0.125
4.125
70
3
1.25
1.063
2.375
0.125
2.375
8
6.625
0.125
2.125
1
4.438
8.688
70
0.125
4.375
* 80
3.75
1.50
1.25
3
0.125
3
9.438
8.375
0.125
2.688
1.25
5.313
10.50
80
0.125
5.50
90
4.75
1.75
1.50
4.125
0.125
4.125
12.125
11.125
0.125
3.50
1.50
6.625
13.063
90
0.125
7.125
100
5.375
2.25
2
4.125
0.125
4.125
13.875
12.125
0.125
4
2
7.375
15.50
100
0.125
8.125
KOP-FLEX® KS COUPLINGS
KS disc couplings are designed to meet API 671 specification requirements and provide a less expensive alternative when application speeds are in the intermediate range. They are typically used for turbine and motor drive applications, where the additional features of the High Performance product line are not required.
Economical API 671 solution
Drop out anti-flail center section
Dynamically balanced for higher speed applications
Rigid hubs allow for large bore capacity
Includes shims to facilitate axial alignment
SIZE
① MAX TORQUE RATING
MAX.
SPEED (RPM)
MAX.
BORE
(in)
②
TOTAL WEIGHT
(lb)
②
TOTAL INERTIA
(lb-in2)
TOTAL STIFFNESS
(lb-in/radx1011)
MISALIGNMENT
RATINGS
CONTINUOUS (n-lb)
PEAK
(in-lb)
AXIAL
(in)
ANGULAR (deg)
103
6000
8000
14200
2.88
22.0
61
0.3
±.080
0.20
153
20400
27200
12500
3.88
41.4
187
1.1
±.115
0.25
204
54000
72000
11100
4.63
69.1
420
2.8
±.100
0.20
254
78000
104000
9900
5.50
99.8
893
4.2
±.120
0.20
304
133500
178000
8700
6.50
152
1770
8.0
±.140
0.20
354
225000
300000
7500
7.50
240
3730
14
±.160
0.20
404
322500
430000
6600
9.00
344
6830
21
±.180
0.20
454
383000
510000
6000
9.75
>455
11400
27
±.200
0.20
504
540000
720000
5600
10.75
576
16600
38
±.230
0.20
554
758000
101000
4800
12.00
792
28400
50
±.250
0.20
604
990000
4600
4600
13.00
992
40700
69
±.270
0.20
705
2265000
3860
3860
15.75
1690
102000
160
±.230
0.15
805
3465000
3450
3450
18.00
2440
186000
240
±.260
0.15
905
3900000
3100
3100
20.00
3180
304000
300
±.340
0.15
① To account for off-design fluctuating or continuous torques, an experience or application factor should be used. API 671 and Kop-Flex recommends 1.5 minimum for general turbomachinery
applications.
② Mass elastic data based on couplings with typical bores and 18 00" shaft separation up to #705, and min. C for #805 and #905; design and data can be changed to meet specific requirements. All major components are made of carbon steel.
① To account for off-design fluctuating or continuous torques, an experience or application factor should be used. API 671 and Kop-Flex recommend a 1.5 minimum for general turbomachinery
applications.
② Mass elastic data based on couplings with typical bores and 18 00" shaft separation up to #705, and min. C for #805 and #905; design and data can be changed to meet specific requirements. All major components are made of carbon steel.
DIMENSIONS
SIZE
A
(IN)
NO
(in)
NI
(in)
TYPICAL
BORE
TYPICAL E
(in)
TYPICAL 0
(in)
MIN. C
(in)
103
5.44
2.25
2.00
2.0
1.94
3.81
4.63
153
6.81
3.00
2.69
2.5
2.38
4.81
5.75
204
7.81
3.88
3.38
3.0
3.00
5.75
6.38
254
9.31
4.88
4.50
3.5
3.56
6.75
6.50
304
10.62
5.50
5.00
4.0
4.12
7.75
7.75
354
12.28
6.25
5.50
4.5
4.62
9.00
9.25
404
13.94
7.00
6.25
5.0
5.25
10.12
10.88
454
15.56
8.00
7.25
5.5
5.88
11.38
1125
504
16.69
8.75
7.75
6.0
6.38
12.25
12.25
554
18.69
9.25
8.25
6.5
7.00
13.62
13.75
604
20.00
10.00
8.75
7.0
7.62
14.62
14.63
705
24.00
12.25
10.38
8.5
9.00
17.50
17.88
805
26.88
13.75
11.50
9.5
10.00
19.50
20.13
905
30.00
16.00
14.25
11.0
11.50
22.00
21.38
① To account for off-design fluctuating or continuous torques, an experience or application factor should be used. API 671 and Kop-Flex recommends 1.5 minimum for general turbomachinery application.
② Mass elastic data based on couplings with typical bores and 18.00" shaft separation up to #705, and min. C for #805 and #905; design and data can be changed to meet specific requirements. All major components are made of carbon steel.
① To account for off-design fluctuating or continuous torques, an experience or application factor should be used. API 671 and Kop-Flex recommend a 1.5 minimum for general turbomachinery application.
② Mass elastic data based on couplings with typical bores and 18.00" shaft separation up to #705, and min. C for #805 and #905; design and data can be changed to meet specific requirements. All major components are made of carbon steel.
KOP-FLEX® HIGH PERFORMANCE MP COUPLINGS
Kop-Flex® High Performance couplings satisfy the requirements for high speed applications. The marine style, MP High Performance Disc coupling is typically used on steam turbines, generators and compressors and meets API 671 specification requirements.
Higher torque capacity than KS product line
Full alloy steel construction
Removable center section
Improved anti-flail design
Rigid hubs allow for large bore capacity
Reduced windage disc pack cover
SIZE
①
NOMINAL
BORE
CAPACITY
④
MAX.
CONTINUOUS TORQUE
RATING
(in-lb)
⑤
MAX MOMENTARY
TORQUE RATING
(in-lb)
MAX. SPEED
(RPM)
⑥
TOTAL WEIGHT
(lb)
⑥
TOTAL INERTIA
(lb-in2)
⑥
HALF COUPLING
C.G (in)
⑥ ⑦
TORSIONAL
STIFFNESS
K
(lb-in/rad x 102)
103
2.5
12000
19000
27700
18.5
52
-0.04
0.52
153
3.5
30000
48000
23100
33.3
154
0.01
1.4
154
3.5
47000
75000
23100
34.3
156
-0.01
1.7
203
4.0
56000
89000
20200
47.8
300
0.17
2.3
204
4.0
83000
132000
20200
48.5
304
0.14
2.6
253
5.0
85000
135000
16900
74.6
669
0.28
4.3
254
5.0
132000
210000
16900
75.5
679
0.25
4.7
303
6.0
138000
219000
14800
109
1290
0.31
7.9
304
6.0
209000
332000
14800
111
1320
0.28
8.8
353
6.5
216000
343000
12800
163
2590
0.26
13
354
6.5
326000
518000
12800
166
2640
0.22
14
355
6.5
407000
647000
12800
169
2670
0.16
15
403
7.5
315000
501000
11300
233
4730
0.23
19
404
7.5
473000
752000
11300
236
4800
0.19
21
405
7.5
591000
940000
11300
240
4840
0.12
24
453
8.5
416000
661000
10100
314
7940
0.44
27
454
8.5
642000
1021000
10100
318
8050
0.40
31
455
8.5
801000
1274000
10100
320
8050
0.35
29
504
9.0
813000
1293000
9400
392
11500
0.56
37
505
9.0
1016000
1615000
9400
399
11700
0.50
40
554
10.0
1082000
1720000
8400
554
20100
0.41
49
555
10.0
1354000
2153000
8400
553
20500
0.35
53
604
11.0
1379000
2193000
7900
655
27700
0.62
70
605
11.0
1724000
2741000
7900
666
28200
0.55
76
655
12.0
2293000
3646000
7000
877
44000
0.33
82
704
13.0
2603000
4139000
6500
1130
69400
0.65
150
705
13.0
3253000
5172000
6500
1150
71100
0.57
160
755
14.0
3663000
5824000
6300
1320
95300
0.46
206
804
14.5
3852000
6125000
6100
1590
140000
0.60
210
805
14.5
4814000
7654000
5900
1650
145000
0.42
250
905
15.0
6516000
10360000
5200
2050
185000
0.76
300
④ 1006
18.0
10361000
18240000
4700
3760
501700
0.03
595
④ 106
20.0
15000000
26400000
3000
4950
795000
1.07
830
General Notes: ① Based on 1.5 hub O.D./ bore ratio; larger bores we possible, consult Kop-Flex for specific applications.
④ API 4th Edition Rating (0.2 degrees misalignment with full axial misalignment capacity).
⑤ Maximum momentary torque capacity as defined by API 671 is used to evaluate applications such as generators with short circuits. RM and MS interlocking flanges can be modified, along with the rest of the coupling, to accommodate capacities 1.5 times this value.
⑥ Data based on coupling with 18' shaft separation and nominal tapered bores for keyless hydraulic shaft connections; data can be changed to meet specific requirements.
⑦ Kop-Flex torsional stiffness calculation.
General Notes: ① Based on 1.5 hub O.D./ bore ratio; larger bores we possible, consult Kop-Flex for specific applications.
④ API 4th Edition Rating (0.2 degrees misalignment with full axial misalignment capacity).
⑤ Maximum momentary torque capacity as defined by API 671 is used to evaluate applications such as generators with short circuits. RM and MS interlocking flanges can be modified, along with the rest of the coupling, to accommodate capacities 1.5 times this value.
⑥ Data based on coupling with 18' shaft separation and nominal tapered bores for keyless hydraulic shaft connections; data can be changed to meet specific requirements.
⑦ Kop-Flex torsional stiffness calculation.
KOP-FLEX® HIGH PERFORMANCE RZS COUPLINGS
Building on our foundation of reliability, safety and exceptional performance, the Kop-Flex® High Performance Disc Coupling 2.0 was created for your highly engineered equipment. To achieve the best weight and power density possible, the coupling diameter was reduced while the torque capacity was aligned with the application. The HPD2.0 design is the lightest coupling available on the market, improving equipment performance in the most critical applications.
Optimized disc geometry improves stress distribution
20-30% weight reduction over previous generation
Lowest overhung moment available
Reduced OD improves balance and reduces windage
22 sizes driven by common customer shafts
SIZE
①
NOMINAL
BORE
CAPACITY
(in)
④
MAX.
CONTINUOUS
TORQUE
RATING
(in-lb)
⑤
MAX MOMENTARY
TORQUE RATING
(in-lb)
MAXIMUM
SPEED (RPM)
⑥
TOTAL
WEIGHT
(lb)
⑥
TOTAL INERTIA
(lb-in2)
⑥
HALF COUPLING
C.G (in)
⑥ ⑦
TORSIONAL
STIFFNESS
K
(lb-in/rad x 102)
2103
1.51
12000
19000
34300
12.2
20
1.12
0.37
2504
1.71
22000
35000
33000
15.5
35
1.17
0.50
3004
2.00
30000
48000
30800
18.2
50
1.45
0.70
3304
2.29
39000
62000
29400
21.3
70
1.67
0.93
3604
2.53
53000
85000
26700
25.9
100
1.91
1.3
4104
2.84
76000
121000
23700
33.5
160
2.16
1.8
4304
3.01
90000
144000
22500
38.1
210
2.26
2.2
4704
3.26
115000
184000
20700
46.2
290
2.44
2.8
5104
3.54
147000
235000
19100
60
450
2 57
3.7
5504
3.79
180000
288000
17800
72
630
2.81
4.7
5804
4.02
215000
344000
16800
84
820
2.96
5.6
6204
4.33
268000
428000
15600
103
1200
3.23
7.3
6504
4.S0
301000
481000
15000
119
1500
3.36
8.6
6904
4.81
367000
587000
14100
140
2000
3.51
10.5
7404
5.12
425000
680000
13200
164
2600
3.84
13.1
7904
5.51
527000
843000
12300
212
4000
4.05
17
8604
5.99
670000
1070000
11300
265
5800
4.33
22
9404
6.49
842000
1350000
10400
331
8500
4.91
29
10104
7.00
1020000
1630000
9700
419
12000
5.16
36
10804
7.51
1270000
2030000
9000
508
18000
5.51
47
11604
8.04
1550000
2480000
8400
635
25000
5.77
57
12404
8.58
1880000
3010000
7900
747
34000
6.13
72
① 4th edition Rating (0.2 degrees misalignment with full axial misalignment capacity).
② Maximum momentary torque capacity as defined by API 671 is used to evaluate applications such as generators with short circuits. Other large noncontinuous torques, called Transient torques in API 671, such as induction and synchronous motor start-ups, are evaluated using low cycle fatigue analysis. The magnitude and frequency of these transient (peaks) are required information. The transient capacity of Kop-Flex High Performance disc couplings is 1.2 times the max. continuous coupling rating for 10.000 cycles.
③ Data based on coupling with 18” shaft separation and nominal tapered bores for keyless hydraulic shaft correction, data can changed to meet specific requirements.
Kop-Flex torsional stillness calculation method.
Specifications and selection data are subject to change without notice
① 4th edition Rating (0.2 degrees misalignment with full axial misalignment capacity).
② Maximum momentary torque capacity as defined by API 671 is used to evaluate applications such as generators with short circuits. Other large noncontinuous torques, called Transient torques in API 671, such as induction and synchronous motor start-ups, are evaluated using low cycle fatigue analysis. The magnitude and frequency of this transient (peaks) are required information. The transient capacity of Kop-Flex High-Performance disc couplings is 1.2 times the max. continuous coupling rating for 10.000 cycles.
③ Data based on coupling with 18” shaft separation and nominal tapered bores for keyless hydraulic shaft correction, data can be changed to meet specific requirements.
Kop-Flex torsional stillness calculation method.
Specifications and selection data are subject to change without notice
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