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
Precision grade JIS B 1704 grade 4 Core hardness HB250300
Gear teeth Gleason Surface hardness HRC5560
Pressure angle 20 Surface treatment -
Material SCM415 (Alloy steel) Surface finish Cut
Heat treatment Teeth induction hardened
after carburizing		 Datum reference surface
for gear cutting		 Bore

B3

20 Miter Module 25

Catalog No. Module No. of
teeth		 Bore Hub dia. Pitch dia. Outside dia. Mounting
distance		 Total length Crown to
back length		 Hub width Length
of bore		 Face width Holding
surface dia.		 Face angle Shape Allowable
torque (kgfm)		 Allowable
torque (Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
m z A B C D E F G H I J K L Bending
strength		 Surface
durability		 Bending
strength		 Surface
durability
MM2-20
[ DXF| DWG| 3D CAD]
MM2.5-20
[ DXF| DWG| 3D CAD]
MM3-20
[ DXF| DWG| 3D CAD]
MM4-20
[ DXF| DWG| 3D CAD]
MM5-20
[ DXF| DWG| 3D CAD]		 2

2.5

3

4

5		 20

20

20

20

20		 12

15

16

20

25		 34

42

52

65

80		 40

50

60

80

100		 42.83

53.54

64.24

85.66

107.07		 35

45

50

65

90		 22.24

28.89

31.19

39.49

60.38		 16.41

21.77

22.12

27.83

43.54		 12

16

16

17.5

30		 20

26

27

35

54		 9

11

14

18

26		 24.54

30.89

34.4

49.09

54.46		 4948'

4948'

4948'

4948'

4948'		 B3

B3

B3

B3

B3		 1.536

2.96

5.3

12.29

26.1		 0.9932

1.941

3.515

8.284

17.79		 15.06

29

52

120.5

256		 9.74

19.03

34.47

81.24

174.5		 0.060.16

0.070.17

0.080.18

0.120.27

0.140.34		 0.13

0.26

0.43

0.97

2.1		 MM2-20

MM2.5-20

MM3-20

MM4-20

MM5-20
Pitch Angle 45
25 Miter Module 25

Catalog No. Module No. of
teeth		 Bore Hub dia. Pitch dia. Outside dia. Mounting
distance		 Total length Crown to
back length		 Hub width Length
of bore		 Face width Holding
surface dia.		 Face angle Shape Allowable
torque(kgfm)		 Allowable
torque(Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
m z A B C D E F G H I J K L Bending
strength		 Surface
durability		 Bending
strength		 Surface
durability
MM2-25
[ DXF| DWG| 3D CAD]
MM2.5-25
[ DXF| DWG| 3D CAD]
MM3-25
[ DXF| DWG| 3D CAD]
MM4-25
[ DXF| DWG| 3D CAD]
MM5-25
[ DXF| DWG| 3D CAD]		 2

2.5

3

4

5		 25

25

25

25

25		 12

16

20

25

28		 45

55

65

85

100		 50

62.5

75

100

125		 52.83

66.03

79.24

105.66

132.07		 40

50

60

80

100		 24.33

30.41

37.81

49.32

60.82		 16.41

20.52

24.62

32.83

41.04		 12.5

15

17.5

22.5

25		 21

27

33

44

50		 12

15

20

25

30		 28.06

36.57

39.43

57.29

65.15		 4851'

4851'

4851'

4851'

4851'		 B3

B3

B3

B3

B3		 2.7

5.27

9.66

22.1

42.1		 2.045

4.049

7.492

17.41

33.57		 26

51.6

94.7

217

413		 20.05

39.71

73.47

170.7

329.2		 0.060.16

0.070.17

0.080.18

0.120.27

0.140.34		 0.22

0.41

0.81

1.9

3.4		 MM2-25

MM2.5-25

MM3-25

MM4-25

MM5-25
Pitch Angle 45

CAUTION: Due to heat treating, some deformation of the bore may occur. It may be necessary to ream the bore to bring it to the stated dimension.
NOTE:

The allowable torques shown in the table are calculated according to JGMA Standards 403-01 and 404-01.

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