Flexible Disc Couplings
series 71 spacer coupling
Now with increased torque ratings, larger bore capacities, and extended sizes.
Flexible Disc Couplings
series 71, designed for the user… here’s why: Common surface for coupling pilot, alignment and field rebore
Patented jacking bolt feature
Non-metallic buffer ring
Factory assembled center member
Piloted hubs and center member
Oversize bore capacity
Self-locking, hex head bolts
■ Fewer parts — three piece design features unitized center member and two piloted fit hubs ■ Quick installation — no special wrenching, easily accessible bolting ■ Easy alignment — piloted flanges, common reference surface ■ Patented jacking bolt feature compresses coupling for easy installation and removal of center assembly
■ Optimized 4, 6 and 8 bolt designs ■ Disc design provides low flexing forces with high overload capacity ■ Manufactured to AGMA Class 9 balance specification when finish bored ■ Meets API 610 requirements when puller bolt holes are specified
A
STANDARD HUB
MAX. BORE
G
EXTENDED HUB
Stocked “C” Dimensions Coupling Size 150 175 225 300
General Dimensions — Inches
“C” Dimension (In.) 3-1/2 4-3/8 • • •
• •
350 375 412 462
5
5-1/2
• • • •
• •
• •
• •
512 562 600
7
B2➃
B1➂
C
B
MAX. BORE
LARGE HUB
E MAX.
7-1/2
8
9
Coupling Size
B & B1 Hub Max. Bore ❼
B2 Hub Max. Bore ❼
A
B
❸ B1
❹ B2
Std. C
Min. C
Max. E
G
• •
150 175 225 300
1.500 1.875 2.250 3.000
2.375 2.750 3.250 4.000
3.59 4.16 4.94 5.97
1.31 1.56 2.00 2.62
1.69 2.06 2.50 3.25
1.62 1.81 2.06 2.75
3.50 3.50 5.00 5.00
3.44 3.44 3.44 4.00
2.06 2.56 3.09 4.12
2.31 2.81 3.34 4.44
• • • •
350 375 412 462
3.500 3.750 4.125 4.625
4.500 5.000 — —
6.75 7.62 8.00 9.00
3.12 3.25 3.62 4.12
3.75 4.00 4.38 5.00
3.00 3.25 — —
5.00 5.50 7.00 7.00
5.00 5.00 6.50 7.00
5.00 5.31 5.75 6.31
5.25 5.66 6.09 6.84
512 562 600
5.125 5.625 6.000
— — —
10.03 10.97 11.72
4.50 5.00 5.25
5.38 6.00 6.38
— — —
7.00 8.00 9.00
7.00 8.00 9.00
7.06 7.69 8.31
7.62 8.38 8.94
712 800 875 1038
7.125 8.000 8.750 10.375
— — — —
13.88 15.56 17.12 19.75
6.25 7.00 7.75 9.00
— — — —
— — — —
9.38 10.88 12.00 14.00
8.88 10.25 11.38 13.25
10.18 11.37 12.50 14.87
10.75 12.00 13.12 15.56
WR2 Change Per Inch of “C” (Lb.-In.2)
Axial Deflection (In.) ❺
No. of Bolts Per Disc
.03 .09 .25 .66
±.050 ±.070 ±.075 ±.085
4 4 6 6
•
•
•
• • •
712 800 875 1038 For “C” dimensions other than shown, consult Rexnord.
Engineering Data Max. Horsepower Per 100 RPM Service Factor
Coupling Size 1.0
2.0
2.5
3.0
.59 1.0 1.9 4.6
.49 .86 1.6 3.8
Max. Continuous Torque (Lb.-In.)
Peak Overload Torque (Lb.-In.)
Weight (Lbs.) ❷
Weight Change Per Inch WR2 of “C” (Lb.-In.2) (Lbs.) ❷
Not. Bal. ➏
Balanced
9,000 8,300 7,700 6,800
20,800 17,000 16,000 14,000
930 1,630 3,060 7,260
1,860 3,260 6,120 14,520
6.7 9.4 14 26
.10 .14 .19 .26
150 175 225 300
1.5 2.6 4.8 11.5
350 375 412 462
21.2 30.6 35.7 64.1
14.2 20.4 23.8 42.7
10.6 15.3 17.8 32.1
8.4 12.2 14.3 25.6
7.1 10.2 11.9 21.4
6,200 5,650 5,350 5,000
13,500 12,000 11,000 10,000
13,400 19,300 22,500 40,400
26,800 38,600 45,000 80,800
43 55 71 101
.42 .43 .60 .80
259 423 615 1,110
1.18 1.62 2.90 4.65
±.090 ±.095 ±.110 ±.120
6 6 6 6
512 562 600
87.3 133 145
58.2 89.0 97.0
43.6 66.7 72.8
34.9 53.4 58.2
29.1 44.5 48.5
4,700 4,350 4,150
9,200 8,300 7,800
55,000 84,100 91,700
110,000 168,200 183,400
135 186 228
1.04 1.28 1.75
1,830 3,020 4,250
7.43 10.38 17.51
±.130 ±.145 ±.160
6 6 6
87.0 128 187 275
69.6 102 149 220
58.0 85.0 123 183
3,450 3,250 3,050 2,900
7,200 6,800 6,400 5,800
110,000 161,000 235,000 346,000
220,000 322,000 470,000 692,000
355 504 672 1,120
1.37 2.17 2.41 3.21
9,090 16,200 26,200 57,000
16.9 33.2 45.6 74.4
±.082 ±.092 ±.102 ±.115
8 8 8 8
712 800 875 1038 ❶ ❷ ❸ ❹ ❺ ❻ ❼
1.5
Max. RPM ❶
174 255 373 549
.98 1.7 3.2 7.7
116 170 250 366
.74 1.3 2.4 5.8
10.6 20.6 42 121
See p. E-46 in the engineering catalog for explanation of RPM limits and balancing recommendations. Weight and WR2 with standard length hubs, maximum bore and standard “C”. Extended hub length is designed longer in order to include a counter-bore for the threaded extension on a tapered shaft. Large hub length. For sizes not shown, consult Rexnord. Thomas Flexible Disc Couplings meet all NEMA (MG1-14.37) specifications without modification or additional end-float restricting devices. Series 71 Coupling assembly meets AGMA Balance Class 9 when furnished with finished bores. Hub sizes 150-600 furnished without a finished bore will be solid. Hub sizes 712 and larger will have a minimum rough bore when finish bore is not specified.
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.
A
STANDARD HUB
MAX. BORE
G
E MAX.
EXTENDED HUB
➃
➂
B
Stocked “C” Dimensions Coupling Size 150 175 225 300
General Dimensions — Millimeters
“C” Dimension (mm) 89 100 111 127 140 178 180 190.5 203.2 228.6 • • •
• •
350 375 412 462
• •
• • • •
• • •
• •
• •
512 562 600
• •
• •
• • • •
• • •
B2
B1
C
MAX. BORE
LARGE HUB
•
•
•
• • •
712 800 875 1038
Coupling Size
B & B1 Hub Max. Bore ❼
B2 Hub Max. Bore ❼
A
B
❸ B1
❹ B2
150 175 225 300
38 48 58 76
— 70 83 102
91.28 105.6 125.4 151.6
33.3 39.7 50.8 66.7
42.9 52.4 63.5 82.6
41.3 46.0 52.4 69.9
350 375 412 462
89 95 105 118
114 127 — —
171.5 193.7 203.2 228.6
79.4 82.6 92.1 104.8
95.3 101.6 111.1 127.0
512 562 600
130 143 152
— — —
254.8 278.6 297.7
114.3 127.0 133.4
712 800 875 1038
181 203 222 264
— — — —
352.4 395.3 435.0 501.7
158.8 177.8 196.9 228.6
Std. C
Min. C
Max. E
G
89 89 127 127
87 87 87 102
52.3 65.0 78.5 104.6
58.7 71.4 84.9 112.8
76.2 82.6 — —
127 139.7 178 178
127 127 165 178
127.0 134.9 146.0 160.3
133.4 143.7 154.8 173.8
136.5 152.4 161.9
— — —
178 203.2 228.6
178 203 229
179.3 195.3 211.1
193.7 212.7 227.0
— — — —
— — — —
238.1 276.2 304.8 355.6
225 260 289 337
258.6 288.8 317.5 377.7
273.1 304.8 333.4 395.3
Weight Change Per cm of “C” (kg)
J (kg-cm2) ❷
Axial Deflection (mm) ❺
No. of Bolts Per Disc
For “C” dimensions other than shown, consult Rexnord.
Engineering Data Max. Kilowatt Per 100 RPM Service Factor
Coupling Size 1.0
2.0
2.5
3.0
.44 .77 1.4 3.4
.36 .64 1.2 2.9
Max. Continuous Torque (Nm)
Peak Overload Torque (Nm)
Weight (kg) ❷
J Change Per cm of “C” (kg-cm2)
Not. Bal. ➏
Balanced
9,000 8,300 7,700 6,800
20,800 17,000 16,000 14,000
105 184 346 820
210 368 692 1,640
3.05 4.24 6.30 11.75
.017 .025 .034 .046
32 60 120 360
.04 .10 .29 .76
±1.3 ±1.8 ±1.9 ±2.2
4 4 6 6
150 175 225 300
1.1 1.9 3.6 8.6
350 375 412 462
15.8 22.8 26.6 47.8
10.6 15.2 17.7 31.9
7.9 11.4 13.3 23.9
6.3 9.1 10.6 19.1
5.3 7.6 8.9 15.9
6,200 5,650 5,350 5,000
13,500 12,000 11,000 10,000
1,515 2,180 2,540 4,565
3,030 4,360 5,080 9,130
19.4 25.1 32.0 45.8
.075 .077 .107 .143
760 1,250 1,800 3,280
1.36 1.87 3.34 5.36
±2.3 ±2.4 ±2.8 ±3.0
6 6 6 6
512 562 600
65.1 99.5 108.5
43.4 66.4 72.4
32.5 49.8 54.3
26.0 39.8 43.4
21.7 33.2 36.2
4,700 4,350 4,150
9,200 8,300 7,800
6,215 9,500 10,360
12,430 19,000 20,720
61.2 84.4 103.4
.185 .229 .313
5,400 8,900 12,500
8.56 12.0 20.2
±3.3 ±3.7 ±4.1
6 6 6
86.8 127 185 273
65.1 95.3 139 205
52.1 76.2 111 164
43.4 63.5 92.7 136
3,450 3,250 3,050 2,900
7,200 6,800 6,400 5,800
12,400 18,200 26,500 39,100
24,800 36,400 53,000 78,200
161 229 305 490
.245 .387 .430 .573
26,650 47,700 77,550 165,000
19.5 38.2 52.5 85.7
±2.1 ±2.3 ±2.6 ±2.9
8 8 8 8
712 800 875 1038 ❶ ❷ ❸ ❹ ❺ ❻ ❼
1.5
Max. RPM ❶
129 190 278 409
.73 1.3 2.4 5.7
.55 .96 1.8 4.3
See p. E-46 in the engineering catalog for explanation of RPM limits and balancing recommendations. Weight and WR2 with standard length hubs, maximum bore and standard “C”. Extended hub length is designed longer in order to include a counter-bore for the threaded extension on a tapered shaft. Large hub length. For sizes not shown, consult Rexnord. Thomas Flexible Disc Couplings meet all NEMA (MG1-14.37) specifications without modification or additional end-float restricting devices. Series 71 Coupling assembly meets ISO G6.3 BALANCE when furnished with finished bores. ISO G2.5 available when specified. Hub sizes 150-600 furnished without a finished bore will be solid. Hub sizes 712 and larger will have a minimum rough bore when finish bore is not specified.
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.
Selection Procedures The following procedure is used to select disc couplings for most applications. Special consideration must be given to coupling selection for those applications involving abnormal loading or design. Rexnord engineers are readily available for selection advice and assistance. Coupling Selection: 1. Determine HP/100 RPM: Horsepower x 100 HP/100 RPM = RPM 2. Determine Service Factor: Select the proper Service Factor from the Table. 3. Select the Coupling Size. 4. Check Limiting Conditions: a. Check maximum speed. b. Check maximum bore. c. Check other dimensions such as shaft separation, overall length, O.D. etc. d. Check to be sure that the maximum torque to be transmitted, such as start-up or stall torques, do not exceed the coupling’s Peak Overload Torque Rating.
Service Factors Service Factors are a means of classifying different equipment and applications into various load classifications. Due to variations in application of equipment, service factors are used to adjust equipment ratings to accommodate for variable loading conditions. Service Factors
Continuous service and running loads vary only slightly.
1.0
Torque loading varies during operation of the equipment.
1.5
Torque loading varies during operation, frequent stop/start cycles are encountered.
2.0
For shock loading and substantial torque variations.
2.5
For heavy shock loading or light reversing drives.
3.0
Typical Service Factor
Application Blowers Centrifugal ............................................. Lobe....................................................... Vane ...................................................... Compressors Centrifugal ............................................. Lobe, Vane, Screw ................................ Reciprocating – Multi-Cylinder............... Axial ....................................................... Fans Centrifugal Forced Draft (Hostile Environment) .......................... Induced Draft (Hostile Environment) .......................... Axial Forced Draft (Hostile Environment) .......................... Induced Draft (Hostile Environment) .......................... Light Duty Blowers & Fans ..................................... Generators Non-Welding .......................................... Oil Industry Chillers................................................... Oil Well Pumping ................................... Paraffin Filter Press ............................... Rotary Kilns ........................................... Pumps Centrifugal General Duty (Liquid)........................... Boiler Feed .......................................... Slurry (Sewage, etc.) ........................... Dredge ................................................. Reciprocating Double Acting ...................................... Single Acting 1 or 2 Cylinders.................................. 3 or more Cylinders ........................... Rotary – Gear, Lobe, Vane.................... Sewage Disposal Equipment................... Sewage Treatment Pumps ......................
1.0 1.5 1.5 1.0 1.5 Consult Rexnord 1.0
1.5 1.5 1.5 1.5 1.0 1.5 1.5 2.0 2.0 2.0
1.0 1.0 1.5 2.0 2.0 2.5 2.0 1.5 1.5 1.5
Balance Recommendations 1038 875
REXNOR D
LASS 10
LASS 11
AG M A C
600 562
AG M A C
712
CONSULT
800
COUPLING SIZE
Load Classifications
Typical Service Factors Motor and Turbine Driven Equipment
512 AGMA CLASS 9 STANDARD
462 412 375 350
Footnote: The Service Factor Table considers the driven equipment only and assumes a normal electric motor or turbine driver. For prime movers of the reciprocating type (engines, etc.) add the following to the Service Factor: For 8 or more cylinders, add 0.5 For 6 cylinders, add 1.0 For 4 cylinders, add 1.5 For less than 4 cylinders, consult Rexnord
300
225 175 1
2
3
4
5 6 7 8 9 10
15
Operating Speed (Thousands of RPM) Note: The above recommendations and balance classes are based on AGMA Specifications 515.02, High Sensitivity. If conditions exist other than as defined in 515.03 for high sensitivity, consult Rexnord. The above information should be used as a guide only. AGMA Class 9 balance furnished as standard with finished bore couplings.
www.rexnord.com World Class Customer Service For over 100 years the dedicated people of Rexnord have delivered excellence in quality and service to our customers around the globe. Rexnord is a trusted name when it comes to providing skillfully engineered products that improve productivity and efficiency for industrial applications worldwide. We are committed to exceeding customer expectations in every area of our business: product design, application engineering, operations and customer service. Because of our customer focus, we are able to more thoroughly understand the needs of your business and have the resources available to work closely with you to reduce maintenance costs, eliminate redundant inventories and prevent equipment down time. Rexnord represents the most comprehensive portfolio of power transmission and conveying components in the world with the brands you know and trust.
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EUROPE Rexnord NV Vilvoorde, Belgium Phone: 32.2.255.8311 Fax: 32.2.720.1023
LATIN AMERICA Rexnord International, Inc. Milwaukee, Wisconsin Phone: 1.414.643.3000 Fax: 1.414.643.3222
UNITED STATES Eastern Service Center Smyrna, Georgia Phone: 1.770.431.7200 Fax: 1.770.431.7299
BRAZIL Rexnord Correntes Ltda. Sao Leopoldo - RS Phone: 55.51.579.8022 Fax: 55.51.579.8029
CHINA Rexnord China Shanghai, China Phone: 86.21.62701942 Fax: 86.21.62701943
Rexnord Kette GmbH Betzdorf, Germany Phone: 49.2741.2840 Fax: 49.2741.284362
MEXICO Rexnord S.A. de C.V. Queretaro, Qro. Phone: 52.442.218.5000 Fax: 52.442.218.1090
Central Service Center Grove City, Ohio Phone: 1.614.675.1800 Fax: 1.614.675.1898
SINGAPORE Rexnord International, Inc. Singapore City, Singapore Phone: 65.6338.5622 Fax: 65.6338.5422
2002
© Copyright 2001 Rexnord Industries, Inc.
Southern Service Center Arlington, Texas Phone: 1.817.385.2800 Fax: 1.817.385.2873
02/01 2.5M - CC Printed in the U.S.A.
