CGI SI SERIES: SPUR GEARHEADS User Manual
Si series: spur gearheads, Nema dimensions precision gearheads

CGI, INC. • 3400 Arrowhead Drive • Carson City, NV 89706 • Tel 775.882.3422 • Fax 775.882.9599 • www.cgimotion.com
SI SERIES: SPUR GEARHEADS
NEMA DIMENSIONS
PRECISION GEARHEADS
(B)
.
SQ.
(J)
(K)
(I)
(A)
(L)
(H)
(G)
(F)
(E)
(D)
(C)
023SIX
034SIX
042SIX
056SIX
.047
.062
.078
.125
2.95
4.38
5.51
7.87
0.205
0.220
0.280
0.410
2.625
3.875
4.950
7.000
0.094 / #303
0.125 / #404
0.156 / #505
0.250 / #808
75
100
150
200
75
125
150
300
023SIX
034SIX
042SIX
056SIX
2.25
3.00
3.75
4.50
20/10
20/10
20/10
20/10
20
60
200
350
30
90
300
500
1.5
3.5
6.5
15.5
7.15E-04
5.35E-04
4.33E-03
6.05E-03
7.59E-04
1.52E-03
7.59E-03
4.57E-02
ALL SPECIFICATIONS SUBJECT TO CHANGE.
*Rotation references the gearhead output shaft
direction with respect to motor shaft direction.
AVAILABLE RATIOS AND SHAFT ROTATION*
SPECIFICATIONS
SIZE 023
3:1
SAME
SIZE 034
3:1
SAME
Input RPM: 4000 Max.
5:1
SAME
5:1
SAME
10:1
SAME
10:1
SAME
15:1
OPPOSITE
15:1
SAME
Minimum Efficiency: 90%
20:1
OPPOSITE
20:1
OPPOSITE
30:1
OPPOSITE
30:1
OPPOSITE
50:1
OPPOSITE
50:1
SAME
Operating Temperature Range -60˚F to +250˚F
100:1
SAME
100:1
SAME
SIZE 042
3:1
SAME
SIZE 056
3:1
SAME
Note: Size 056 Requires a Mounting Adapter
5:1
SAME
5:1
SAME
10:1
SAME
10:1
OPPOSITE
15:1
OPPOSITE
15:1
OPPOSITE
Motor Mounting Hardware Supplied
20:1
OPPOSITE
25:1
OPPOSITE
30:1
SAME
40:1
SAME
50:1
OPPOSITE
100:1
SAME
PART
NUMBER
A
PILOT
DIAMETER
(in.)
B
SQUARE
FLANGE
(in.)
C
SHAFT
LENGTH
(in.)
D
SHAFT
DIAMETER
(in.)
E
PILOT
LENGTH
(in.)
F
FLANGE
THICKNESS
(in.)
G
KEY
LOCATION
(in.)
023SIX
034SIX
042SIX
056SIX
1.498/1.500
2.873/2.875
2.185/2.187
4.498/4.500
2.25
3.25
4.20
5.75
1.00
1.25
1.50
2.00
.3745/.3750
.4995/.5000
.6245/.6250
.9995/1.0000
0.062
0.062
0.062
0.125
0.188
0.375
0.500
1.000
0.38
0.56
0.50
0.63
PART
NUMBER
H
KEY
HEIGHT
(in.)
I
HOUSING
DIAMETER
(in.)
J
BOLT HOLE
DIAMETER
(in.)
K
BOLT HOLE
CIRCLE
(in.)
KEY WIDTH/
WOODRUFF
KEY
(in.)
RADIAL SHAFT
LOADING
(LBS.)
AXIAL SHAFT
LOADING
(LBS.)
PART
NUMBER
L
GEARHEAD
LENGTH
(in.)
BACKLASH
STD/LOW
(ARC-MINUTES)
CONTINUOUS
TORQUE MAX.
(IN LBS.)
MOMENTARY
TORQUE MAX.
(IN LBS.)
GEARHEAD
WEIGHT
(LBS.)
MAX. INERTIA
REFLECTED
TO INPUT
(OZ. IN. SEC
2
)
PINION GEAR
INERTIA
(OZ. IN. SEC
2
)