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KD2®-KD20-KD21-KD22 Couplings

KD2-KD20-KD21-KD22

 

Non stock spacers are available in the KD® couplings and gear couplings for applications with extended shaft separations.

The KD2®, KD20, KD21 and KD22 spacer couplings are designed for medium to heavy-duty applications. They require moderate shaft separations. 

Full flex spacer gear couplings are used for 4 bearing installations with extended shaft ends. LEF END FLOAT (LEF) spacer couplings are used for sleeve bearing motor applications with extended shaft separations. LEF spacers are supplied with steel LEF plates installed in each end.

 

Product Cross Reference

 

 

Features & Benefits

KD® Series Couplings

 

KD2® SPACER COUPLINGS

  • Sizes 053 - 453.
  • Max. bores to 7.25" (standard hub).
  • Jumbo hubs available for larger bores.
  • Medium duty - 3 bolt design.
  • Standard shaft separation for industrial pumps.
  • Factory-assembled flexible center assembly with unitized disc packs.
  • Highly flexible, unitized disc packs.
  • AGMA Class 9 balance as manufactured.
  • Designed specifically for API 610.
  • Nomenclature: Example 203KD2SS700 -- size 203, type KD2®, two standard rough bore hubs with 7" spacer -- complete coupling.

KD20 SPACER COUPLINGS

  • Sizes 204 - 905.
  • Max. bore up to 13.5".
  • Strongest design in the market Standard shaft separation for industrial pumps.
  • Factory-assembled flexible center assembly with unitized disc packs.
  • High torque disc packs - 4 bolt design.
  • AGMA Class 9 balance as manufactured - class 10 and 11 available options.
  • Designed specifically for API 610.
  • Use jumbo hubs to downsize or for larger bores.
  • Nomenclature: Example 204KD20SS1200 -- size 204, type KD20, two standard rough bore hubs with 12" spacer -- complete coupling.

KD21 SPACER COUPLINGS

  • Sizes 103 - 905.
  • Max. bore up to 13.5".
  • Heavy duty applications.
  • Simple 3-piece design.
  • Standard shaft separation for industrial pumps.
  • Drop-out unitized disc packs.
  • Rating similar to gear couplings.
  • Economical design.
  • Nomenclature: Example 304KD21SS900 -- size 304, type KD21, two standard rough bore hubs with 9" spacing -- complete coupling.

KD22 SPACER COUPLINGS

  • Sizes 103 - 905.
  • Max. bore up to 11.5".
  • Heavy duty applications.
  • Designed to directly replace standard spacer style gear type couplings.
  • Drop out spacer for ease of installation.
  • Standard shaft separation for industrial pumps.
  • High torque unitized disc packs.
  • Ratings similar to gear couplings.
  • Uses KD42 flex half and standard gear coupling spacer.

 

Gear

 

FAST'S® COUPLINGS

  • 300% greater lube capacity.
  • All-metal end rings.
  • 2 to 3 times the life vs. o-ring style.
  • 6" (152 mm) to 78" (2 m) OD.
  • Max. bore up to 36" (914 mm).
  • Coupling of choice with longest history.
  • Custom-design and specials available see catalog.
  • O-ring style seal.
  • Half for half interchangeable with all AGMA standard couplings.
  • Max. bore up to 43.5" (1.1 meter).
  • Max. torque up to 284 million lb-in (32100 kN-m).
  • Slide, shear pin, floating shaft, alloy steel, and other styles available.
  • Custom design and specials available.

WALDRON® COUPLINGS

  • High misalignment seal to prevent grease leakage.
  • Greater tooth contact than other spherical styles.
  • 40° tooth.
  • Max. bore up to 9.25" (235 mm).
Related Documents
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KD2-KD20-KD21-KD22
KD2-KD20-KD21-KD22
KD2-KD20-KD21-KD22

Additional Data

 

KD2® Spacer coupling

Selection Data

 

Size Maximum Bores (in)  Coupling Rating  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 Spacer coupling

Selection Data

 
Size Maximum Bores (in)  Coupling Rating  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 Spacer coupling

Selection Data

 

Size  Maximum Bore (in)  Coupling Rating(HP/100 RPM)  Torque Rating  Maximum Speed RPM Total Weight(lbs)  Total WR2 (lb-in2)  Spacer Tube 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  250000  510000  7200  205  4360  2.54  37.0  +-.250
 504  7.00  570  360000  720000  6600  305  7460  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 Spacer coupling

Selection Data

 

Size Max Bore(in) Maximum 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  2.64  57.1  36000  72000  12000  +-.110
254  3.25  82.5  52000  104000  10600  +-.140
304  3.75  141  89000  178000  9800  +-.170
354  4.25  238  150000  300000  8400  +-.200
404  4.75  340  215000  430000  7400  +-.225
454  5.50  405  255000  510000  6750  +-.250
504  5.75  570  360000  720000  6000  +-.275
554  6.25  800  505000  1010000  5500  +-.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

 

 

Coupling Size  Maximum Bore with Standard Keyway  Maximum Bore with Reduced Depth Keyway Reduced Depth Keyway  Rating HP/100 RPM Torque Rating(lb.-in.) Peak Torque Rating (lb.-in.) Maximum Speed (RPM)  Weight with Solid Hubs(lb.) Dimensions 
 A  B  C E  O 
 1 1/2  1 5/8  1 3/4  3/8 x 1/8  27  17000
   34000  12000  16.5  6  4  1/8 1 15/16   2 3/16
 2  2 1/8  2 1/4  1/2 x 3/16
   50  31500
   63000  9300  27.4  7  4 15/16  1/8  2 7/16  2 7/8
 2 1/2  2 3/4  3
  3/4 x 3/16  90  56700  113400  7900  48.0  8 3/8  6 3/16  3/16  3 1/32  3 5/8
 3  3 1/8  3 3/8  7/8 x 1/4  160  101000  202000  6800  70.8  9 7/16  7 5/16  1/4  3 19/32  4 1/4
 3 1/2  3 3/4  4  1 x 5/16  235  148000  296000  6000  113  11  8 1/2  1/4  4 3/16  5
 4  4 1/4  4 1/2  1 x 3/8  375  236000  472000  5260  177  12 1/2  9 3/4  5/16  4 3/4  5 3/4
 4 1/2  4 3/4  5 1/2  1 1/4 x 7/16  505  318000  636000  4770  231  13 5/8  10 15/16  5/16  5 5/16  6 1/2
 5  5 1/2  5 7/8  1 1/2 x 7/16  700  441000  882000  4300  351  15 5/16 12 1/16  5/16  6 1/32  7 5/16
 5 1/2  5 7/8  6 3/8  1 1/2 x 1/2  920  580000  1160000  3880  435  16 3/4 13 13/16  5/16  6 29/32  8
 6  6 1/2  7  1 3/4 x 1/2  1205  759000  1518000  3600  538  18 14 13/16  5/16  7 13/32  8 13/16
 7  8  8 1/2  2 x 1/2  1840  1160000  2320000  3000  860  20 3/4 17 5/16  3/8  8 11/16  10 5/16

 

Coupling Size  Maximum Bore with Standard Keyway   Rating HP/100 RPM Torque Rating(lb.-in.) Peak Torque Rating (lb.-in.)  Maximum Speed (RPM)  Weight with Solid Hubs(lb.)  Dimensions  Shrouded Bolt and Exposed Bolt 
 A  B C   E  O  Bolt Circle  Number and Size
 1  1 1/8  10.5  6600  13200  14500  5.5  4  2 5/8  1/8  1 1/4  1 9/16  3 5/16  6-1/4
 1 1/2  1 5/8  18.5  11500  23000  12000  11  5  3 1/2  1/8  1 11/16  2 3/16  4 3/32  6-5/16
 2  2 1/8  36.5  23000  46000  9300  19  6  4 5/16  1/8  2 3/32  2 7/8  5  6-3/8
 2 1/2  2 3/4  62  39000  78000  7900  31  7  5 1/4  1/8  2 9/16  3 11/16  6  6-3/8
 3  3 1/8  110  69300  138600  6800  57   8 3/8  6 1/2  3/16  3 5/32  4 1/4  7 3/16  8-1/2
 3 1/2  3 3/4  186  117200  234400  6000  81  9 7/16  7 3/4  3/16  3 25/32  5  8 1/4  10-1/2

 

Coupling Size  Maximum Bore with Standard Keyway  Maximum Bore with Reduced Depth Keyway Reduced Depth Keyway  Rating HP/100 RPM Torque Rating(lb.-in.) Peak Torque Rating (lb.-in.)  Maximum Speed (RPM)  Weight with Solid Hubs(lb.) Dimensions 
 A  B  C C1 CW E  G  KN   KR O 
 1  1 5/8  1 3/4  3/8 x 1/8  12  7500  15000  14500  10  4 9/16  3 1/16  1/8  3/16  1/4  1 11/16  3 1/16  7/32  9/32  2 3/8
 1 1/2  2 1/4  2 3/8  5/8 x 7/32  27  17000  34000  12000  18  6  3 9/16  1/8  5/16  1/2  1 15/16  3 15/16  7/32  13/32  3 1/8
 2  2 7/8  3  3/4 x 1/4  50  31500  63000  9300  33  7  4 11/16  1/8  9/16  1  2 7/16  4 15/16  5/32  19/32  4
 2 1/2  3 1/2  3 3/4  7/8 x 5/16  90  56700  113400  7900  57  8 3/8  5 3/8  3/16  15/32  3/4  3 1/32  5 7/8  7/16  23/32  4 7/8
 3  4  4 3/8  1 x 3/8  160  101000  202000  6800  85  9 7/16  6 9/16  3/16  29/32  1 5/8  3 19/32  6 7/8  13/32  1 1/8  5 5/8
 3 1/2  4 5/8  5  1 1/4 x 7/16  235  148000  296000  6000  130  11  7 11/16  1/4  1 1/16  1 7/8  4 3/16  7 29/32  15/32  1 9/32  6 1/2
 4  5 1/2  6 1/8  1 1/2 x 1/2  375  236000  472000  5260  192  12 1/2  8 3/4  1/4  1 1/4  2 1/4  4 3/4  9 1/4  1/2  1 1/2 7 3/4 
 4 1/2  6 1/4  6 7/8  1 3/4 x 1/2  505  318000  636000  4770  261  13 5/8  9 11/16  5/16  1 7/16  2 9/16  5 5/16  10 3/8  5/8  1 3/4  8 1/2
 5  7 1/8  7 3/8  1 3/4 x 1/2  700  441000  882000  4300  376  15 5/16  11 1/16  5/16  1 31/32  3 5/8  6 1/32  11 9/16  21/32  2 5/16  9 1/2
 5 1/2  8  8 1/4  2 x 1/2  920  580000  116000  3880  474  16 3/4  12 7/16  5/16  2 3/32  3 7/8  6 29/32  12 11/16  27/32  2 5/8  10 1/2
 6  8 7/8  9 1/4  2 1/2 x 5/8  1205  759000  1518000  3600  604  18  13 5/16  5/16  2 11/32  4 3/8 7 13/32   13 7/8  29/32  2 15/16  11 1/2
 7  10 3/8  10 3/4  2 1/2 x 3/4  1840  1160000  2320000  3000  902  20 3/4  15 3/8  3/8  2 13/16  5 1/4  8 11/16  16 1/16  1 3/16  3 5/8  13 1/2

 

 

Coupling Size 

 Maximum Bore with Standard Key Rating HP/100 RPM Torque Rating(lb.-in.)  Peak Torque Rating (lb.-in.)  Maximum Speed (RPM)  Dimensions 
A  B  C  C1  CW  E  G   O
 1  1 5/8  10  6300  12600 10000  4 9/16  3 3/16  1/8  3/8  5/8  1 11/16 3   2 5/16
 1 1/2  2 3/16  24  15100  30200  7400  6  3 7/8  1/8  9/16  1  2 1/16  3 13/16  3 1/8
 2  2 3/4  50  31500  63000  5900  7  4 5/8  1/8  13/16  1 1/2  2 7/16  4 13/16  4
 2 1/2  3 1/4  90  56700  113400  5000  8 3/8  5 11/16  3/16  29/32  1 5/8  3 1/32  5 23/32  4 23/32
 3  4  150  96500  189000  4300  9 7/16  6 9/16  3/16  1 1/32  1 7/8  3 19/32  6 23/32  5 5/8
 3 1/2  4 3/4  230  145000  290000  3900  11  7 5/8  1/4  1 5/16  2 3/8  4 3/16  7 3/4  6 5/8
 4  5 3/8  350  221000  442000  3500  12 1/2  8 5/8  1/4  1 7/16  2 5/8  4 3/4  8 31/32  7 1/2
 4 1/2  6  480  300000  600000  3200  13 5/8  9 5/8  5/16  1 5/8  2 15/16  5 3/8  10 1/8  8 1/2
 5  6 3/4  650  410000  820000  2900  15 5/16  10 13/16  5/16  1 11/16  3 1/16  6 1/8  11 3/8  9 1/2
 5 1/2  7 1/2  850  536000  1072000  2700  16 3/4  11 5/8  5/16  1 7/8  3 7/16  6 5/8  12 9/16  10 27/64
 6  8 1/4  1100  693000  13860000  2500  18  13 1/4  5/16  2 5/16  4 5/16  7 3/8  13 7/8  11 3/4
 7  9 1/4  1600  1010000  20200000  2200  20 3/4  14 3/4  3/8  2 3/16  4  8 11/16  15 3/4  13 3/4

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Commercial Systems|Industrial Systems