Quality Transmission is the largest North American supplier of off-the-shelf metric gearing. KHK Stock Gears are proudly produced by Kohara Gear Industry of Saitama Japan and stocked in North America by Quality Transmission Components



Specifications
Catalog No. SW BG CG
Precision grade KHK W 001 grade 4 KHK W 002 grade 4 KHK W 002 grade 4
Reference section
of gear		 Normal plane Normal plane Normal plane
Gear teeth JIS 3 type Standard full depth Standard full depth Standard full depth
Normal pressure angle 1430' 1430' 1430'
Material S45C (Carbon steel) PBC2 and BC6 (Bronz) FC200 (Gray iron)
Heat treatment - - -
Surface hardness HB165194 - -
Surface treatment Black oxide - -
Surface finish Cut Cut Cut
Datum reference surface
for gear cutting		 Bore Bore Bore

W1 H1
H2 HB

Module 4 Worms

Catalog No. Number of
start		 Hand of
thread		 Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L) Total length Screw Shape Weight
(kgf)
LH7 M N O P Q Q' R Size S
SW4-R1
[ DXF | DWG | 3D CAD]
SW4-R2
[ DXF | DWG | 3D CAD]		 1

2

 R

R

 22

22

 50

50

 62

62

 70

70

 70

70

 25

25

 -

-

 95

95

 -

-

 -

-

 W1

W1

 1.7

1.7

Catalog No. Number of
start		 Hand of
thread		 Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L) Total length Screw Shape Weight
(kgf)
LH7 M N O P Q Q' R Size S
SW4-L1
[ DXF | DWG | 3D CAD]
SW4-L2
[ DXF | DWG | 3D CAD]		 1

2

 L

L

 22

22

 50

50

 62

62

 70

70

 70

70

 25

25

 -

-

 95

95

 -

-

 -

-

 W1

W1

 1.7

1.7

Lead Angle R1(L1) 342' R2(L2) 725'

Module 4 Worm Gears

Catalog No. Reduction
ratio		 No. of
teeth		 Coefficient of
profile shift 		Number of
start		 Hand of
thread		 Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width Total length Mounting
distance		 Shape Allowable
torque (kgfm)		 Allowable
torque (Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
AH7 B C D D' E F G J Surface
durability		 Surface
durability
BG4-20R1
[ DXF|DWG | 3D CAD]
BG4-20R2
[ DXF|DWG | 3D CAD]		 1/20

1/10

 20

20

 -0.021

-0.084

 1

2

 R

R

 20

20

 60

60

 80.17

80.67

 88

88

 90

90

 35

35

 17

17

 52

52

 71

71

 H1

H1

 2.35

2.18

 23.02

21.41

 0.220.32

0.220.32

 1.8

1.8

 BG4-20R1

BG4-20R2

Catalog No. Reduction
ratio		 No. of
teeth		 Coefficient of
profile shift 		Number of
start		 Hand of
thread		 Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width Total length Mounting
distance		 Shape Allowable
torque (kgfm)		 Allowable
torque (Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
AH7 B C D D' E F G J Surface
durability		 Surface
durability
BG4-20L1
[ DXF|DWG | 3D CAD]
BG4-20L2
[ DXF|DWG | 3D CAD]		 1/20

1/10

 20

20

 -0.021

-0.084

 1

2

 L

L

 20

20

 60

60

 80.17

80.67

 88

88

 90

90

 35

35

 17

17

 52

52

 71

71

 H1

H1

 2.35

2.18

 23.02

21.41

 0.220.32

0.220.32

 1.8

1.8

 BG4-20L1

BG4-20L2

Module 4 Worm Gears

Catalog No. Reduction
ratio		 No. of
teeth		 Coefficient of
profile shift		 Number of
start		 Hand of
thread		 Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width (R) Hub width (L) Total length Web
thickness		 Web O.D. Mounting
distance		 Shape Allowable
torque (kgfm)		 Allowable
torque (Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
AH7 B C D D' E F F' G H I J Surface
durability		 Surface
durability
CG4-20R1
[ DXF|DWG | 3D CAD]
CG4-20R2
[ DXF|DWG | 3D CAD]
CG4-30R1
[ DXF|DWG | 3D CAD]
CG4-30R2
[ DXF|DWG | 3D CAD]
CG4-40R1
[ DXF|DWG | 3D CAD]		 1/20

1/10

1/30

1/15

1/40

 20

20

30

30

40

 -0.021

-0.084

-0.031

-0.127

-0.042

 1

2

1

2

1

 R

R

R

R

R

 20

20

20

20

20

 60

60

60

60

70

 80.17

80.67

120.25

120.01

160.33

 88

88

128

128

168

 90

90

130

130

171

 35

35

35

35

35

 17

17

17

17

17

 -

-

-

-

-

 52

52

52

52

52

 -

-

12

12

11

 -

-

96

96

136

 71

71

91

91

111

 H1

H1

HB

HB

HB

 2.35

2.18

5.19

4.82

9.12

 23.02

21.41

50.87

47.3

89.44

 0.220.32

0.220.32

0.220.32

0.220.32

0.220.32

 1.5

1.5

2.5

2.5

3.7

 CG4-20R1

CG4-20R2

CG4-30R1

CG4-30R2

CG4-40R1

CG4-50R1
[ DXF|DWG | 3D CAD]
CG4-50R2
[ DXF|DWG | 3D CAD]
CG4-60R1
[ DXF|DWG | 3D CAD]		 1/50

1/25

1/60

 50

50

60

 -0.052

-0.211

-0.063

 1

2

1

 R

R

R

 20

20

20

 70

70

80

 200.42

201.69

240.5

 208

208

248

 211

211

251

 35

35

35

 17

17

17

 -

-

-

 52

52

52

 12

12

12

 176

176

218

 131

131

151

 H2

H2

H2

 14

13.24

19.78

 137.3

129.9

194

 0.220.32

0.220.32

0.220.32

 4.5

4.5

5

 CG4-50R1

CG4-50R2

CG4-60R1

Catalog No. Reduction
ratio		 No. of
teeth		 Coefficient of
profile shift		 Number of
start		 Hand of
thread		 Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width (R) Hub width (L) Total length Web
thickness		 Web O.D. Mounting
distance		 Shape Allowable
torque (kgfm)		 Allowable
torque (Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
AH7 B C D D' E F F' G H I J Surface
durability		 Surface
durability
CG4-20L1
[ DXF|DWG | 3D CAD]
CG4-20L2
[ DXF|DWG | 3D CAD]
CG4-30L1
[ DXF|DWG | 3D CAD]
CG4-30L2
[ DXF|DWG | 3D CAD]
CG4-40L1
[ DXF|DWG | 3D CAD]		 1/20

1/10

1/30

1/15

1/40

 20

20

30

30

40

 -0.021

-0.084

-0.031

-0.127

-0.042

 1

2

1

2

1

 L

L

L

L

L

 20

20

20

20

20

 60

60

60

60

70

 80.17

80.67

120.25

120.01

160.33

 88

88

128

128

168

 90

90

130

130

171

 35

35

35

35

35

 17

17

17

17

17

 -

-

-

-

-

 52

52

52

52

52

 -

-

12

12

11

 -

-

96

96

136

 71

71

91

91

111

 H1

H1

HB

HB

HB

 2.35

2.18

5.19

4.82

9.12

 23.02

21.41

50.87

47.3

89.44

 0.220.32

0.220.32

0.220.32

0.220.32

0.220.32

 1.5

1.5

2.5

2.5

3.7

 CG4-20L1

CG4-20L2

CG4-30L1

CG4-30L2

CG4-40L1

CG4-50L1
[ DXF|DWG | 3D CAD]
CG4-50L2
[ DXF|DWG | 3D CAD]
CG4-60L1
[ DXF|DWG | 3D CAD]		 1/50

1/25

1/60

 50

50

60

 -0.052

-0.211

-0.063

 1

2

1

 L

L

L

 20

20

20

 70

70

80

 200.42

201.69

240.5

 208

208

248

 211

211

251

 35

35

35

 17

17

17

 -

-

-

 52

52

52

 12

12

12

 176

176

218

 131

131

151

 H2

H2

H2

 14

13.24

19.78

 137.3

129.9

194

 0.220.32

0.220.32

0.220.32

 4.5

4.5

5

 CG4-50L1

CG4-50L2

CG4-60L1

CAUTION: Before assembling or performing any secondary operations, please carefully read the "Application Hints" at the beginning of this section.
CAUTION: These worm gears are profile shifted to create the proper center distance.
NOTE: Allowable torques shown in the table are the calculated values according to JGMA Standards 405-01 when the worm is rotating at 600 rpm, The table below shows the allowable worm gear torques at selected worm speeds.

BG4 Allowable Worm Gear Torques(kgfm)

Catalog No. Worms rpm
30
100
300
600
900
1200
BG4-20R1
BG4-20R2
4.65
4.64
3.77
3.67
2.93
2.74
2.35
2.18
2.06
1.89
1.84
1.68

CG4 Allowable Worm Gear Torques(kgfm)

Catalog No. Worms rpm
30
100
300
600
900
1200
CG4-20R1
CG4-20R2
CG4-30R1
CG4-30R2
CG4-40R1
CG4-50R1
CG4-50R2
CG4-60R1
4.65
4.64
9.82
9.88
16.80
25.40
25.52
35.53
3.77
3.67
8.07
7.99
13.83
20.92
20.77
29.42
2.93
2.74
6.36
6.06
11.05
16.86
16.35
23.74
2.35
2.18
5.19
4.82
9.12
14.00
13.24
19.78
2.06
1.89
4.58
4.26
8.06
12.46
11.61
17.78
1.84
1.68
4.07
3.76
7.20
11.19
10.40
15.92

 

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