FAST’S® Gear Couplings

AISE Mill Motor Coupling

The FAST’S Mill Motor Coupling is designed
for use on AISE and other mill motors having
tapered shafts with locknuts, and are used pri-
marily in the metals industry. This design is
also commonly used on other types of equip-
ment which use tapered shafts with locknuts,
such as turbines, pumps, and compressors.

The standard “composite” mill motor hub is a

semi-finished hub which can be modified and
bored to fit a variety of AISE mill motor frames.
Note that one size of coupling will fit several
motor frames; conversely, several sizes may
fit a single motor frame. See page 53 for proper
coupling selection.

Maximum Torque Peak Maximum Weight with

Coupling Bore with Rating Torque Dimensions
Size Standard HP / 100 RPM Rating Rating Speed Solid Hubs
(lb.-in.) (RPM) (lb.) A B E
Key (lb.-in.)
1 1/2 1 5/8 27 17000 34000 12000 18.4 6 4 1 15/16
2 2 1/8 50 31500 63000 9300 30.5 7 4 15/16 2 7/16
2 1/2 2 3/4 90 56700 113400 7900 53.0 8 3/8 6 3/16 3 1/32
3 3 1/8 160 101000 202000 6800 76.8 9 7/16 7 5/16 3 19/32
3 1/2 3 3/4 235 148000 296000 6000 123 11 8 1/2 4 3/16

4 4 1/4 375 236000 472000 5260 184 12 1/2 9 3/4 4 3/4

4 1/2 4 3/4 505 318000 636000 4770 242 13 5/8 10 15/16 5 5/16
5 5 1/2 700 441000 882000 4300 365 15 5/16 12 1/16 6 1/32
5 1/2* 5 7/8 920 580000 1160000 3880 434 16 3/4 13 13/16 6 29/32
6* 6 1/2 1205 759000 1518000 3600 562 18 14 13/16 7 13/32
7* 8 1840 1160000 2320000 3000 862 20 3/4 17 5/16 8 11/16

See next page for additional dimensions.

* Sizes 5 1/2, 6 and 7 are only available with exposed bolts. Type EB exposed bolts are standard.

MILL MOTOR COMPOSITE HUB MILL MOTOR COMPOSITE HUB

ROUGH BORED FINISH BORED

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 FAST’S® Gear Couplings
AISE Mill Motor Coupling

For: Rough Bored Composite Hub Finish Bored Composite Hub For AISE Mill Motors
Type AISE Dimensions & Part Numbers Dimensions & Part Numbers
MM Mill Dimensions Dimensions Bore Dia.
Coupling Motor
Size Frame Part Large Small Keyway Part
Sizes CH EM XM WM Number C CFM EFM XFM WFM Number
End End
1 1/2 802 9/16 3 9/16 1 5/16 2 1/4 1 1/2F MMHUB 1/8 1 1/16 13/16 2 3/16 1/2 X 1/8 1 1/2F MMHUB02
2 602 3/4 4 7/16 1 9/16 2 7/8 2F MMHUB 1/8 1 1/16 1 1/4 1 3/4 2F MMHUB02
AC1 3 1.749 1.437
2 1/2 AC2 13/16 4 9/16 2 3/32 2 15/32 2 1/2F MMHUB 3/16 1 1/8 1 25/32 1 7/32 1/2 X 1/4 2 1/2F MMHUB02
3 AC4 1 1/16 5 1/8 2 13/32 2 23/32 3F MMHUB 3/16 1 1/8 2 11/32 21/32 3F MMHUB02
2 3/4 4 7/16 1 9/16 2 7/8 2F MMHUB 1/8 1 1/8 1 3/16 2 5/16 2F MMHUB0304
803 2 1/2F
2 1/2 13/16 4 9/16 2 3/32 2 15/32 2 1/2F MMHUB 3/16 1 3/16 1 23/32 1 25/32 MMHUB0304
804
3 1/2 1.999 1.634 1/2 X 1/4
3 603 1 1/16 5 1/8 2 13/32 2 23/32 3F MMHUB 3/16 1 3/16 2 9/32 1 7/32 3F MMHUB0304
604
3 1/2F
3 1/2 1 1/8 5 3/4 2 15/16 2 13/16 3 1/2F MMHUB 1/4 1 1/4 2 13/16 11/16
MMHUB0304
2 1/2 806 13/16 4 9/16 2 3/32 2 15/32 2 1/2F MMHUB 3/16 1 5/16 1 19/32 2 13/32 2 1/2F MMHUB06
3 606 1 1/16 5 1/8 2 13/32 2 23/32 3F MMHUB 3/16 1 5/16 2 5/32 1 27/32 3F MMHUB06
4 2.499 2.082 1/2 X 1/4
3 1/2 AC8 1 1/8 5 3/4 2 15/16 2 13/16 3 1/2F MMHUB 1/4 1 3/8 2 11/16 1 5/16 3 1/2F MMHUB06
AC12
4 1 1/8 6 3/8 3 1/2 2 7/8 4F MMHUB 1/4 1 3/8 3 1/4 3/4 4F MMHUB06
3 1 1/16 5 1/8 2 13/32 2 23/32 3F MMHUB 3/16 1 7/16 2 1/32 2 15/32 3F MMHUB08
806 41/2 2.999 2.530 3/4 X 1/4
3 1/2 608 1 1/8 5 3/4 2 15/16 2 13/16 3 1/2F MMHUB 1/4 1 1/2 2 9/16 1 15/16 3 1/2F MMHUB08
4 1 1/8 6 3/8 3 1/2 2 7/8 4F MMHUB 1/4 1 1/2 3 1/8 1 3/8 4F MMHUB08
3 1 1/16 5 1/8 2 13/32 2 23/32 3F MMHUB 3/16 1 9/16 1 29/32 2 19/32 3F MMHUB10
3 1/2 810 1 1/8 5 3/4 2 15/16 2 13/16 3 1/2F MMHUB 1/4 1 5/8 2 7/16 2 1/16 3 1/2F MMHUB10
610 4 1/2 3.249 2.780 3/4 X 1/4
4 AC18 1 1/8 6 3/8 3 1/2 2 7/8 4F MMHUB 1/4 1 5/8 3 1 1/2 4F MMHUB10
4 1/2 1 5/8 6 7/16 3 19/32 2 27/32 4 1/2F MMHUB 5/16 1 11/16 3 17/32 31/32 4 1/2F MMHUB10
3 1/2 812 1 1/8 5 3/4 2 15/16 2 13/16 3 1/2F MMHUB 1/4 1 3/4 2 5/16 2 11/16 3 1/2F MMHUB12
4 612 1 1/8 6 3/8 3 1/2 2 7/8 4F MMHUB 1/4 1 3/4 2 7/8 2 1/8 4F MMHUB12
AC25 5 3.623 3.102 3/4 X 1/4
4 1/2 1 5/8 6 7/16 3 19/32 2 27/32 4 1/2F MMHUB 5/16 1 13/16 3 13/32 1 19/32 4 1/2F MMHUB12
AC30
5 1 5/8 6 4 5/32 1 27/32 5F MMHUB 5/16 1 13/16 3 31/32 1 1/32 5F MMHUB12
4 814 1 1/8 6 3/8 3 1/2 2 7/8 4F MMHUB 1/4 1 7/8 2 3/4 2 1/4 4F MMHUB14
614
4 1/2 AC40 1 5/8 6 7/16 3 19/32 2 27/32 4 1/2F MMHUB 5/16 1 15/16 5 3 9/32 1 23/32 4.248 3.727 1 X 3/8 4 1/2F MMHUB14
5 AC50 1 5/8 6 4 5/32 1 27/32 5F MMHUB 5/16 1 15/16 3 27/32 1 5/32 5F MMHUB14
4 1/2 1 5/8 6 7/16 3 19/32 2 27/32 4 1/2F MMHUB 5/16 2 1/16 4 5/32 2 11/32 4 1/2F MMHUB16
816 1 5/8 6 4 5/32 1 27/32 5F MMHUB 5/16 2 1/16 5 1/2 3 23/32 1 25/32 4.623 4.050 1 1/4 X 3/8 5F MMHUB16
5 616
5 1/2 1 5/8 8 5/16 4 23/32 319/32 5 1/2F MMHUB 5/16 2 1/16 3 5/8 1 7/32 5 1/2F MMHUB16
4 1/2 1 5/8 6 7/16 3 19/32 2 27/32 4 1/2F MMHUB 5/16 1 5/8 3 19/32 2 13/32 4 1/2F MMHUB18
818
5 618 1 5/8 6 4 5/32 1 27/32 5F MMHUB 5/16 1 5/8 6 4 5/32 1 27/32 4.998 4.373 1 1/4 X 1/2 5F MMHUB18
5 1/2 1 5/8 8 5/16 4 23/32 3 19/32 5 1/2F MMHUB 5/16 1 5/8 4 23/32 1 9/32 5 1/2F MMHUB18
5 1/2 1 5/8 8 5/16 4 23/32 3 19/32 5 1/2F MMHUB 5/16 2 1/16 4 9/32 2 15/32 5 1/2F MMHUB20
620 6 3/4 5.873 5.170 1 1/2 X 3/4
6 2 1/16 9 7/8 4 27/32 5 1/32 6F MMHUB 5/16 2 1/16 4 27/32 1 29/32 6F MMHUB20
6 2 1/16 9 7/8 4 27/32 5 1/32 6F MMHUB 5/16 2 11/16 4 7/32 3 1/32 6F MMHUB22
622 7 1/4 6.247 5.492 1 1/2 X 3/4
7 2 3/4 9 1/4 5 5/16 3 15/16 7F MMHUB 3/8 2 3/4 5 5/16 1 15/16 7F MMHUB22
6 2 1/16 9 7/8 4 27/32 5 1/32 6F MMHUB 5/16 2 11/16 4 7/32 5 1/32 1 1/2 X 1/2 6F MMHUB24
624 9 1/4 6.997 6.034
7 2 3/4 9 1/4 5 5/16 3 15/16 7F MMHUB 3/8 2 3/4 5 5/16 3 15/16 1 1/2 X 3/4 7F MMHUB24

*ALL KEYWAYS SHOWN ARE PARALLEL TO THE TAPER. TAPER IS 11/4 INCH PER FOOT ON DIAMETER.

IV. TAPERED BORES For Tapered Shafts, with or without locknut.

Determine applicable AISE Mill Motor frame or provide data below:
1. U Major diameter.
2. V Length of tapered portion of shaft.
3. X Length to face of lockwasher.
4. Y Length of threaded projection.
5. ZW Locknut diameter across corners.
6. W Clearance to bearing housing.
7. Taper (inches on diameter per foot of length).
8. Keyway width and depth.
9. Whether keyway is parallel to shaft or to taper.
10. C Shaft separation if machines are in place.

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