ATRA-FLEX Catalog 2025

COUPLINGS ARE MADE TO ORDER

M-SERIES

FLYWHEEL COUPLINGS

G

I

H

FIGURE 6 FLYWHEEL

"E"

BC

FIGURE 22 FLYWHEEL

d1

D5

BC

D2

D3

D1

D5

d2

K

CH

CH

L4

SIZE M4 M5 M6 M7 M8 M9 M10 M12 SAE FLYWHEEL COUPLING DIMENSIONS (IN INCHES) FOR Millennium

D1

7.600 9.700 11.800 13.260 15.460 17.860 19.875 27.600

SIZE

d1

d2

E

L4

H

I

MAX BORE MAX RPM W/O BALANCING

D1

D2

D3

G

D2

5.500 6.500 8.000 9.000 10.500 12.000 14.000 18.500

D3 M4 7.600 5.500 6.400 0.500 0.050 0.200 0.375 5.725 3.250 2.275 M5 9.700 6.500 8.180 0.090 0.060 0.200 0.375 6.815 4.500 2.115 d1 M6 11.800 8.000 9.930 0.600 .060 0.200 0.625 8.875 5.550 3.125 M7 13.260 9.000 11.900 1.000 0.060 0.200 0.750 10.450 6.000 4.250 M8 15.460 10.500 13.900 1.500 0.060 0.200 0.750 12.700 7.250 5.250 d2 M9 17.860 12.000 15.900 1.500 0.060 0.200 1.000 14.825 9.000 5.625 E

3.375 4.500 5.500 6.000 7.250 9.000

3000 2500 2100 1800 1500 1300 1000

6.400 8.180 9.930 11.900 13.900 15.900 17.900 23.900

0.500 0.090 0.600 1.000 1.500 1.500 1.250 1.500

0.050 0.060 0.060 0.060 0.060 0.060 0.060 0.060

0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.250

L4 0.375 0.375 0.625 0.750 0.750 1.000 1.250 1.250 M10 19.875 14.000 17.900 1.250 0.060 0.200 1.250 16.000 10.000 5.750 10.000 G 5.725 6.815 8.875 10.450 12.700 14.825 16.000 20.750 M12 27.600 18.500 23.900 1.500 0.060 0.250 1.250 20.750 13.250 7.250 13.250

900

H

3.250 4.500 5.550 6.000 7.250 9.000 10.000 13.250

FLYWHEEL DIMENSIONS FOR STANDARD CLUTCH DIAMETERS

I

2.275 2.115 3.125 4.250 5.250 5.625 5.750 7.250

6.57

.5 MAX BORE

81

0

11.51

41

61

82

12

4

SAE

3.375 4.500 5.500 6.000 7.250 9.000 10.000 13.250

8.500 9.500 10.375 12.375 13.875 18.375 20.375 22.500 26.500 28.875 7.875 8.750 9.625 11.625 13.125 17.250 19.250 21.375 25.250 27.250 MAX RPM W/O BALANCING 3,000 2,500 2,100 1,800 1,500 1,300 1,000 900

D5 BC

.3125 .3125

.375

.375

.375

.625

.625

.750

.750

.750

L4

.3281 .3281 .3906 .3906 .3906 .5156 .5156 .6406 .6406 .7656

CH

CHX

68688886

12

12

SAE 6.5 7.5 8 10 11.5 14 16 18 21 24

D5 8.500 9.500 10.375 12.375 13.875 18.375 20.375 22.500 26.500 28.875

*Factory recommends a service factor of 3.0 to 4.0 **Refer to horsepower capacity at various RPM on page 4 for Millennium® ***Consult factory for custom sizes

BC 7.875 8.750 9.625 11.625 13.125 17.250 19.250 21.375 25.250 27.250

L4 0.3125 0.3125 0.375 0.375 0.375 0.625 0.625 0.750 0.750 0.750

CH 0.3281 0.3281 0.3906 0.3906 0.3906 0.5156 0.5156 0.6406 0.6406 0.7656

CHX

6

8

6

8

8

8

8

6

12

12

Factory recommends a service factor of 3.0 to 4.0. Consult factory for custom sizes.

26

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