Compressor and Pump Couplings

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.

kopflex


KD® PRODUCT LINE OVERVIEW

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


kopflex


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
kopflex


  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


  1. Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
  2. Standard keyed bores per ANSI/AGMA 9002. Contact Kop-Flex for other fit requirements.
  3. Max. bore for allay keyless hubs is given for reference only. Contact Kop-Flex Engineering with specific requirements.


Kop-flex Kd2 or Kd20 Couplings drawing


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


  1. Additional standard center assembly lengths are available as stock items. Custom lengths are also available, contact Kop-Flex for more information.
  2. Weight and Inertia are based on max. bore keyed standard hub, Hub Length "E” and Typical “C” Dimensions.
  3. 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
kopflex


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


  1. Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
  2. Standard keyed bores per ANSI/AGMA 9002. Contact Kop-Flex for other lit requirements.
  3. Max bore for alloy keyless hubs is given for reference only. Contact Kip-Flex Engineering with specific requirements.


Kop-flex Kd21 Couplings


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


  1. Additional standard center assembly lengths are available as stock items. Custom lengths are also available, contact Kop-Flex for more information
  2. Weight and Inertia are based on max. bore keyed hub, Hub Length "E" and “Typical "C” Dimensions.
  3. 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
kopflex


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


  1. Combined coupling ratings are based on simultaneous conditions shown. Contact Kop-Flex Engineering for maximum allowable values for your specific application.
  2. Standard keyed bores per ANSI/ALMA 9002. Contact Kop-Flex for other fit requirements.
  3. Max. bore for alloy keyless hubs is given for reference only. Contact Kop-Flex Engineering with specific requirements.


KD23 Couplings Drawing


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


  1. Weight and Inertia are based on max bore keyed hub. Hub Length "E" and Typical “C” Dimensions.
  2. Torsional stifness 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
 
kopflex


SIZE
MAX
BORE
OF FLEX
HUB
(in)
PEAK
CAPACITY
(HP/100 RPM)
PEAK
TORQUE
(in-lbx102)

VIBRATORY
TORQUE
(in-lb x 102)

MAX.
SPEED
(RPM)
NUMBER
OF
CAVITIES

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


Math Equation

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.

 

CB Couplings drawing


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
TOTAL
HUB RESILLIENT
BLOCKS
SLEEVE &
END RING
RIGID HALF
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.



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
kopflex


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


  1. 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.
  2. For infrequently applied loads not to exceed once per hour.
  3. For higher speeds, refer to Kop-Flex.


ELASTOMERIC Couplings


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
kopflex


SIZE ① MAX TORQUE RATING MAX.
SPEED (RPM)
MAX.
BORE
(in)

TOTAL WEIGHT
(lb)

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.



Kop flex Ks Couplings drawing


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.



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
kopflex


SIZE
NOMINAL
BORE
CAPACITY

MAX.
CONTINUOUS TORQUE
RATING
(in-lb)

MAX MOMENTARY
TORQUE RATING
(in-lb)
MAX. SPEED
(RPM)

TOTAL WEIGHT
(lb)

TOTAL INERTIA
(lb-in2)

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.



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


kopflex
SIZE
NOMINAL
BORE
CAPACITY
(in)

MAX.
CONTINUOUS
TORQUE
RATING
(in-lb)

MAX MOMENTARY
TORQUE RATING
(in-lb)
MAXIMUM
SPEED (RPM)

TOTAL
WEIGHT
(lb)

TOTAL INERTIA
(lb-in2)

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

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