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KD® Disc Couplings

KD

 

The KD® Disc Couplings are specifically designed to accommodate general purpose drive system applications. These include the following:


• Centrifugal Pumps
• Compressors
• Generators
• Cooling towers
• Machine tools
• Printing machines
• Pulp & Paper machines

The KD Couplings transmit torque. They also provide for angular and axial misalignment between shafts with a specific configuration. That configuration is comprised of shaft-mounted hubs connected through flexible disc packs with spacer or sleeve assemblies.

 

Product Cross Reference

 



All KD Couplings use stainless steel discs as flexible members, providing high strength and good corrosion resistance. The streamline disk pack design results in the reaction load on equipment bearings being minimized. These disc pack couplings are inherently self-centering; additional provision for limited end float is not required.

Most disc packs are unitized and self-locking nuts are provided. This simplifies installation and replacement.

The KD  Disc Couplings are now available in an expanded range of sizes and styles suitable for common installations. Or if you need something special, we can design a coupling to meet your specific requirements.

 

 

Features & Benefits:

  • Piloted Flange.
  • Standard disc couplings - no lubrication.
  • Theory of Operation: Transmits torque through thin scalloped flexible disc pack.
  • Available from shelf for immediate shipment.
  • Designed to meet API 610.
  • Close coupled and spacer style.
  • Custom-design available.
  • Wide variety of styles and sizes.
Related Documents
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Additional Data

DISC STYLE DESIGNATION
Close Coupled KD1, KD10, KD11
Spacer KD2, KD20, KD21, KD22
Cooling Tower KD33
Floating Shaft KD4, KD41/KD42, KD42 Slide

 

Close Coupled

KD1 and 10

KD1 Coupling With MT Disc Packs

Size range: 103 to 453

Bore range: .50 - 5.50"

Overview: Unitized Disc Pack replaced without moving connected machines

Medium Duty Applications

 

KD1 and 10

KD10 Coupling With HS Disc Packs

Size range: 103 to 905

Bore range: .50 - 11.50"

Overview: Unitized Disc Pack replaced without moving connected machines

Heavy Duty Applications

Rating similar to gear couplings

 

KD11

KD11 Coupling With HT Disc Packs

Size range: 103 to 905

Bore range: .50 - 11.50"

Overview: Unitized Disc Pack

Heavy Duty Applications

Rating similar to gear couplings

 

KD1 Coupling

The KD1 Coupling is designed for close coupled applications with minimal to short distance between shaft ends and light to medium loading. It can directly replace most REWTHOMAS*DBZ couplings and the unitized disc pack makes the installation simpler and easier.

 
Size   Max. Bore(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed Not Balanced(RPM)  Maximum Speed Balanced(RPM) Total Weight(lbs)   Total WR2 (lb-in2) Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.62  4.3  2710  5420  5400  9700  8.1  18.6  +/-060
 153  2.25  12.5  7880  15760  4500  7500  19.8  83.9  +/-075
 203  2.75  22.9  14400  28800  4100  6700  31.9  184  +/-090
 253  3.25  37.5  23600  47200  3600  5600  51.6  417  +/-105
 303  3.88  60.0  37800  75600  3200  5100  77.3  856  +/-125
 353  4.38  100  63000  126000  2900  4400  129  1940  +/-150
 403  5.00  155  97700  195000  2600  4000  189  3720  +/-175
 353  5.50  205  129000  258000  2400  3800  223  5170  +/-200

 

KD10 Coupling

The KD10 coupling is designed to work in place of standard close coupled gear coupling applications with minimal distance between shaft ends. the power capacity of the KD10 coupling is the highest in the industry, allowing the easiest conversion from a lubricated coupling to a low maintenance disc coupling.

 

Size   Max. Bore(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed Not Balanced(RPM)  Maximum Speed Balanced(RPM) Total Weight(lbs)   Total WR2(lb-in2) Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.50  6.3  4000  8000  5400  9700  6.9  16  +/-080
 153  2.12  21.6  13600  27200  4500  7500  17.5  73  +/-140
 204  2.62  57.1  36000  72000  4100  6700  27.2  148  +/-110
 254  3.25  82.5  52000  104000  3600  5600  47.2  400  +/-140
 304  3.75  141  89000  178000  3200  5100  78.0  916  +/-170
 354  4.25  238  145000  290000  2900  4400  134  2140  +/-200
 404  4.75  340  215000  430000  2600  4000  193  3850  +/-225
 454  5.50  405  255000  510000  2400  3800  229  5540  +/-250
 504  5.75  570  360000  720000  2200  3500  316  8640  +/-275
 554  6.25  800  505000  1010000  1900  3000  404  13100  +/-300
 604  6.75  1050  660000  1320000  1850  2900  559  22200  +/-320
 705  8.50  2400  1510000  3020000  1800  2800  925  56400  +/-270
 805  9.50  3670  2100000  4200000  1600  2500  1340  102000  +/-310
 905  11.50  4130  2300000  4600000  1500  2300  1700  163000  +/-400
  

KD11 Coupling

KD11 coupling is designed to work in place of standard close coupled gear coupling applications with higher speed service. the power capacity of the KD11 coupling is the highest in the industry, allowing the easiest conversion from a lubricated coupling to a low maintenance disc coupling.

   
Size   Max. Bore(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed (RPM) Total Weight(lbs)   Total WR2 (lb-in2) Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.50  6.3  4000  8000  14200  9.0  27  +/-080
 153  2.12  21.6  13600  27200  12500  18.6  90  +/-140
 204  2.62  57.1  36000  72000  11100  29.2  189  +/-110
 254  3.25  82.5  52000  104000  9900  43.8  400  +/-140
 304  3.75  141  89000  178000  9700  69.6  839  +/-170
 354  4.25  238  150000  300000  7500  111  1790  +/-200
 404  4.75  340  215000  430000  6600  168  3450  +/-225
 454  5.50  405  255000  510000  6000  204  5220  +/-250
 504  5.75  570  360000  720000  5600  272  7920  +/-275
 554  6.25  800  505000  1010000  4800  364  13200  +/-300
 604  6.75  1050  660000  1320000  4600  458  21100  +/-320
 705  8.50  2400  1510000  3020000  3860  824  52400  +/-270
 805  9.50  3670  2310000  4620000  3450  1220 98000  +/-310
 905  11.50  4130  2600000  5200000  1520  1520  151000  +/-400

Spacer Styles

KD2 and 20

KD2® Coupling With MT Disc Packs

Size range: 103 to 453

Bore range: .50 - 5.50"

Overview: Unitized Disc Pack replaced without moving connected machines

Medium Duty Applications

 

KD2 and 20

KD20 Coupling With HT Disc Packs

Size range: 103 to 905

Bore range: .50 - 11.50"

Overview: Unitized Disc Pack replaced without moving connected machines

Heavy Duty Applications

Rating similar to gear couplings

 

KD21

KD21 Coupling With HT Disc Packs

Size range: 103 to 905

Bore range: .50 - 11.50"

Overview: Unitized Disc Pack

Heavy Duty Applications

Rating similar to gear couplings

 

KD2®  Coupling

The KD2 coupling is designed for medium duty applications requiring moderate shaft separations, and was specifically engineered to meet API610 specifications for industrial, pump couplings. Consisting of three main parts, two hubs and a factory assembled flexible center section which installs or drops out as one unit, the KD2 greatly simplifies installation or maintenance.

 

Size   Max. Bores(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed (RPM) Total Weight(lbs)   Total WR2 (lb-in2)  Spacer Tube Weight per inch Axial Capacity(in) 
 Std & Long Hub  Jumbo Hub  Continuous(in-lb)  Peak(in-lb)  Weight(lbs)  WR2 (lb-in2)
 023  1.50  2.00  2.3  1450  2900  25500  5.5  10.5  0.17  0.10  +/-040
 103  1.88  2.75  4.3  2710  5420  17000  9.9  22.0  0.44  0.45  +/-060
 153  2.88  4.00  12.5  7880  15760  14200  23.2  93.1  0.54  1.06  +/-075
 203  3.25  4.62  22.9  14400  28800  12800  35.5  205  0.56  1.67  +/-090
 253  4.00  5.62  37.5  23600  47200  11500  58.8  475  0.73  3.59  +/-105
 303  4.75  6.50  60.0  37800  75600  10000  89.6  989  1.14  7.52  +/-125
 353  5.50  7.62  100  63000  126000  8500  145  2160  1.57  12.70  +/-150
 403  6.25  8.75  155  97700  195000  7500  220  4290  1.84  19.80  +/-175
 453  7.25  9.38  205  129000  258000  7000  261  6180  2.01  27.00  +/-200
  

KD20 Coupling

The KD20 coupling is designed for heavy duty applications requiring moderate shaft separations, and was  specifically engineered to meet API610 specifications for industrial, pump couplings. Consisting of three main parts, two hubs and a factory assembled flexible center section which installs or drops out as one unit, the KD20 greatly simplifies installation or maintenance.

    
Size   Max. Bores(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed (RPM) Total Weight(lbs)   Total WR2 (lb-in2)  Spacer Tube Weight per inch Axial Capacity(in) 
 Std & Long Hub  Jumbo Hub  Continuous(in-lb)  Peak(in-lb)  Weight(lbs)  WR2(lb-in2)
 204  3.25  4.62  57.1  36000  72000  13000  39.2  230  0.81  2.67  +/-110
 254  4.00  5.62  82.5  52000  104000  11200  61.2  510  0.79  4.36  +/-140
 304  4.75  6.5  141  89000  178000  9900 104  1190  1.17  8.06  +/-170
 354  5.50  7.62  238  150000  300000  8800  172  2630  1.96 17.0  +/-200
 404  6.25  8.75  340  215000  430000  7800  251  4920  2.21  24.3  +/-225
 454  7.25  9.38  405  255000  510000  7200  302  7200  2.54  37.0  +/-250
 504  7.50  -  570  360000  720000  6600  427  11600  3.67  62.6  +/-275
 554  8.25  -  800  505000  1010000  6100  569  18200  3.89  74.7  +/-300
 604  9.00  - 1050  660000  1320000  5600  777  29500  5.21  115  +/-320
 705  10.88  -  2400  1510000  3020000  4500  1360  77500  9.40  303  +/-270
 805  12.25  -  3670  2310000  4620000  4000  2060  150000  12.6  507  +/-310
 905  13.50  -  4130  2600000  5200000  3600  2490  227000  11.7  662  +/-400

KD21 Coupling

The KD21 coupling is designed for medium and heavy duty applications requiring moderate shaft separations. The minimal number of components yields an economical disc coupling solution to spacer applications. The larger sizes available in the KD21 Series allow application to larger, higher power machines.

 

Size   Max. Bores(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed (RPM) Total Weight(lbs)   Total WR2 (lb-in2)  Spacer Tube Weight per inch Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)  Weight(lbs)  WR2 (lb-in2)
 053  1.75  3.2  2000  4000  8200  7.7  16  0.50  0.42  +/-055
 103  1.75  6.3  4000  8000  18200  7.8  16  0.24  0.27  +/-080
 153  2.50  21.6  13600  27200  14800  17.7  67  0.39  0.80  +/-140
 204  3.00  57.1  36000  72000  13000  29.8  160  0.81  2.67  +/-110
 254  3.75  82.5  52000  104000  11200  44.3  336  0.79  4.36  +/-140
 304  4.50  141  89000  178000  9900  70.4  745  1.17  8.06  +/-170
 354  5.00  238  150000  300000  8800  117  1640  1.96  17.0  +/-200
 404  5.50  340  215000  430000  7800  177  3150  2.21  24.3  +/-225
 454  6.38  405  255000  510000  7200  205  4360  2.54  37.0  +/-250
 504  7.00  570  360000  720000  6600  305  7640  3.67  62.6  +/-275
 554  7.75  800  505000  1010000  6100  402  11800  3.89  74.7  +/-300
 604  8.50  1050  660000  1320000  5600  512  17800  5.21  115  +/-320
 705  10.75  2400  1510000  3020000  4500  922  50000  9.40  303  +/-270
 805  12.00  3670  2310000  4620000  4000  1350  93800  12.6  507  +/-310
 905  13.50  4130  2600000  5200000  3600  1700  146000  11.8  675  +/-400

KD22 Coupling

The KD22 coupling is designed to be the most direct replacement for standard spacer style gear couplings and is meant for heavy duty applications where the flexible section must be located on the equipment shafts. the power capacity of the KD22 coupling is the highest in the industry, allowing the easiest conversion from a lubricated coupling to a low maintenance disc coupling.

 

Size   Max. Bore(in) Max. Continuous Rating (HP/100 RPM)   Torque Rating  Maximum Speed (RPM) Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.50  6.3  4000  8000  17000  +/-080
 153  2.12  21.6  13600  27200  13500  +/-140
 204  2.62  57.1  36000  72000  12000  +/-110
 254  3.25  82.5  52000  104000  9800  +/-140
 304  3.75  141  89000  178000  8400  +/-170
 354  4.25  238  150000  300000  7400  +/-200
 404  4.75  340  215000  430000  6750  +/-225
 454  5.50  405  255000  510000  6000  +/-250
 504  5.75  570  360000  720000  5500  +/-275
 554  6.25  800  505000  1010000  4800  +/-300
 604  6.75  1050  660000  1320000  5100  +/-320
 705  8.50  2400  1510000  3020000  4500  +/-270
 805  9.50  3670  1278000  2556000  3950  +/-310
 905  11.50  4130  1784000  3568000  3300  +/-400

COOLING TOWER

 

Cooling Tower

KD2® Coupling With MT Disc Packs

Size range: 103 to 453

Bore range: .50 - 5.50"

Overview: Unitized Disc Pack replaced without moving connected machines

Medium Duty Applications

 

KD33 Coupling

Designed specifically for cooling tower drives and long span applications, the KD33 coupling is easy to handle, install and maintain. The drive shaft is a corrosion resistant lightweight composite tube of either special fiberglass or carbon graphite fibers engineered to provide the optimum combination of strength and bending stiffness required of cooling tower couplings.

 

Single Flex & Floating Shafts

 

KD4

KD4 Coupling With HT Disc Packs

Size range: 103 to 905

Bore range: .50 - 13.50"

Overview: Single Flex

Unitized "Drop-Out" Disc Pack

Heavy Duty Applications

 

KD41

KD41 Coupling With HT Disc Packs

Size range: 103 to 905

Bore range: .50 - 13.50"

Overview: Floating Shaft design

Unitized "Drop-Out" Disc Pack

Heavy Duty Applications

 

KD42

KD42 Coupling With HT Disc Packs

Size range: 103 to 905

Bore range: .50 - 11.50" flex-half

Overview: Floating Shaft design

Bolts Directly to Gear Coupling Rigids

Unitized Disc Pack

Heavy Duty Applications

 

KD4 Coupling

The KD4 coupling is designed for medium and heavy duty applications requiring only angular misalignment capacity as in three bearing installations or floating shaft arrangements. Consisting of three main parts, two hubs and a unitized disc pack which installs or drops out, the KD4 simplifies installation or maintenance. The close tolerance bolts and safety overload washers insure superior performance and trouble free operation.

 

Size   Max. Bore(in) Coupling Rating (HP/100 RPM)   Torque Rating  Maximum Speed (RPM) Total Weight(lbs)   Total WR2 (lb-in2) Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.75  6.3  4000  8000  18200  5.2  9.5  +/-040
 153  2.50  21.6  13600  27200  14800  11.4  38.5  +/-070
 204  3.00  57.1  36000  72000  13000  24.1  124  +/-055
 254  3.75  82.5  52000  104000  11200  32.2  212  +/-070
 304  4.50  141  89000  178000  9900  50.5  462  +/-085
 354  5.00  238  150000  300000  8800  78.5  980  +/-100
 404  5.50  340  215000  430000  7800  118  1880  +/-113
 454  6.38  405  255000  510000  7200  150  2780  +/-125
 504  7.00  570  360000  720000  6600  197  4380  +/-138
 554  7.75  800  505000  1010000  6100  277  7250  +/-150
 604  8.50  1050  660000  1320000  5600  348  10900  +/-160
 705  10.75  2400  1510000  3020000  4500  625  30500  +/-135
 805  12.00  3670  2310000  4620000  4000  915  57000  +/-155
 905  13.50  4130  2600000  5200000  3600  1250  95000  +/-200

KD41 Coupling

The KD41 coupling is designed for medium and heavy duty applications requiring longer shaft separations. The minimal number of components yields an economical disc coupling solution to spacer applications. The larger sizes available in the KD41 Series allow application to larger, higher power machines.

  
Size   Max. Bore(in) Coupling Rating (HP/100 RPM)   Torque Rating Total Weight(lbs)   Total WR2 (lb-in2) Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.75  6.3  4000  8000  10.4  19  +/-080
 153  2.50  21.6  13600  27200 22.8  77  +/-140
 204  3.00  57.1  36000  72000  48.2  247  +/-110
 254  3.75  82.5  52000  104000  64.5  425  +/-140
 304  4.50  141  89000  178000  101  925  +/-170
 354  5.00  238  150000  300000  157  1960  +/-200
 404  5.50  340  215000  430000  237  3760  +/-225
 454  6.38  405  255000  510000  299  5550  +/-250
 504  7.00  570  360000  720000  395  8750  +/-275
 554  7.75  800  505000  1010000  554  14500  +/-300
 604  8.50  1050  660000  1320000  697  21700  +/-320
 705  10.75  2400  1510000  3020000  1250  61000  +/-270
 805  12.00  3670  2310000  4620000  1830  114000  +/-310
 905  13.50  4130  2600000  5200000  2510  190000  +/-400

KD42 Coupling

The KD42 coupling is designed for medium and heavy duty applications requiring longer shaft separations. The minimal number of components yields an economical disc coupling solution to spacer applications. The larger sizes available in the KD42  Series allow application to larger, higher power machines.

 

Size  Flex Max. Bore(in) Coupling Rating (HP/100 RPM)   Torque Rating Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 103  1.50  6.3  4000  8000  +/-080
 153  2.12  21.6  13600  27200  +/-140
 204  2.62  57.1  36000  72000  +/-110
 254  3.25  82.5  52000  104000  +/-140
 304  3.75  141  89000  178000  +/-170
 354  4.25  238  150000  300000  +/-200
 404  4.75  340  215000  430000  +/-225
 454  5.50  405  255000  510000  +/-250
 504  5.75  570  360000  720000  +/-275
 554  6.25  800  505000  1010000  +/-300
 604  6.75 920  640000  1290000  +/-320
 705  8.50  1840  1280000  2560000  +/-270
 805  9.50  2230  1780000  3560000  +/-310
 905  11.50  4130  2600000  5200000  +/-400
  

KD42 Floating shaft

The KD42 floating shaft coupling uses two flexible half couplings mounted on a solid center shaft, simplifying installation or maintenance. the unitized disc packs, close tolerance bolts and safety overload washers provide superior performance and trouble-free near zero back-lash operation.

 

Size  Coupling Rating (HP/100 RPM)   Torque Rating Axial Capacity(in) 
 Continuous(in-lb)  Peak(in-lb)
 204  57.1  36000  72000  +/-1.50
 254  82.5  52000  104000  +/-1.50
 304  141  89000  178000  +/-1.50
 354  238  150000  300000  +/-1.50
 404  340  215000  430000  +/-1.50
 454  405  255000  510000  +/-1.50
 504  570  360000  720000  +/-2.00
 554  800  505000  1010000  +/-2.00
 

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Commercial Systems|Industrial Systems