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 Grade N5 (JIS B 1702-1:1998)
JIS Grade 1 (JIS B 1702:1976)		 Core hardness HB300320
Gear teeth Standard full depth Surface hardness HRC 5560
Pressure angle 20 Surface treatment -
Material SCM415 Surface finish Ground
Heat treatment Overall carburizing Datum reference surface
for gear grinding		 Bore

S1 S4

Module 4

Catalog No. No. of teeth Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length Web thickness Web O.D. Keyway Shape Allowable torque(kgfm) Allowable torque(Nm) Backlash
(mm)		 Weight
(kgf)		 Catalog No.
z AH7 B C D E F G H I JK Bending
strength		 Surface
durability		 Bending
strength		 Surface
durability
MSGA4-15
[ DXF| DWG| 3D CAD]
MSGB4-15
[ DXF| DWG| 3D CAD]		 15 25

30		 48 60 68 40 20 60 - - 83.3

83.3		 S1 59.65 30.84 585 302.4 0.140.24 0.92
0.8		 MSGA4-15
MSGB4-15
MSGA4-18
[ DXF| DWG| 3D CAD]
MSGB4-18
[ DXF| DWG| 3D CAD]		 18 25

30		 50 72 80 40 20 60 - - 83.3

83.3		 S1 79.26 46.35 777.3 454.5 0.140.24 1.5
1.4		 MSGA4-18
MSGB4-18
MSGA4-20
[ DXF| DWG| 3D CAD]
MSGB4-20
[ DXF| DWG| 3D CAD]		 20 28

32		 60 80 88 40 20 60 - - 83.3

103.3		 S1 92.77 58.57 909.8 574.4 0.140.24 1.7
1.3		 MSGA4-20
MSGB4-20
MSGA4-24
[ DXF| DWG| 3D CAD]
MSGB4-24
[ DXF| DWG| 3D CAD]		 24 28

32		 60 96 104 40 20 60 - - 83.3

103.3		 S1 114.8 83.49 1126 818.7 0.140.24 2.4
2.3		 MSGA4-24
MSGB4-24
MSGA4-25
[ DXF| DWG| 3D CAD]
MSGB4-25
[ DXF| DWG| 3D CAD]		 25 30

35		 60 100 108 40 20 60 - - 83.3

103.3		 S1 121.6 91.35 1192 895.8 0.140.24 2.5
2.4		 MSGA4-25
MSGB4-25
MSGA4-30
[ DXF| DWG| 3D CAD]
MSGB4-30
[ DXF| DWG| 3D CAD]		 30 35

40		 70 120 128 40 20 60 - - 103.3

123.3		 S1 155.9 134.2 1529 1316 0.160.26 3.6
3.5		 MSGA4-30
MSGB4-30
MSGA4-35
[ DXF| DWG| 3D CAD]
MSGB4-35
[ DXF| DWG| 3D CAD]		 35 35

40		 70 140 148 40 20 60 - - 103.3

123.3		 S1 191 185.3 1873 1817 0.160.26 5.5
5.3		 MSGA4-35
MSGB4-35
MSGA4-36
[ DXF| DWG| 3D CAD]
MSGB4-36
[ DXF| DWG| 3D CAD]		 36 35

40		 70 144 152 40 20 60 - - 103.3

123.3		 S1 198.1 196.5 1943 1927 0.160.26 5.8
5.6		 MSGA4-36
MSGB4-36
MSGA4-40
[ DXF| DWG| 3D CAD]
MSGB4-40
[ DXF| DWG| 3D CAD]		 40 40

45		 80 160 168 40 20 60 - - 123.3

143.8		 S1 216.3 233.6 2121 2291 0.160.26 6.5
6.3		 MSGA4-40
MSGB4-40
MSGA4-45
[ DXF| DWG| 3D CAD]
MSGB4-45
[ DXF| DWG| 3D CAD]		 45 40

45		 80 180 188 40 20 60 - - 123.3

143.8		 S1 250.7 298.8 2459 2930 0.160.26 8.8
8.6		 MSGA4-45
MSGB4-45
MSGA4-48
[ DXF| DWG| 3D CAD]
MSGB4-48
[ DXF| DWG| 3D CAD]		 48 40

45		 80 192 200 40 20 60 26 160 123.3

143.8		 S4 271.5 341.9 2662 3353 0.160.26 6.5
6.3		 MSGA4-48
MSGB4-48
MSGA4-50
[ DXF| DWG| 3D CAD]
MSGB4-50
[ DXF| DWG| 3D CAD]		 50 40

50		 85 200 208 40 20 60 26 168 123.3

143.8		 S4 285.4 371.9 2799 3647 0.160.26 8.3
7.9		 MSGA4-50
MSGB4-50

CAUTION: No secondary operations can be performed on these gears due to the carburizing process
NOTE: The allowable torques shown in the table are the calculated values according to JGMA Standards 401-01 and 402-01.The backlash values shown in the table are the theoretical values of a pair of identical gears in mesh.

An example of KHK's inspection report
on tooth profile and lead errors.
USEFUL HINT: The precision grade of a spur gear (JIS B 1702-1) is determined by factors such as single pitch error, pitch variation error, accumulated pitch error, tooth profile error, run out error, load error etc.

 

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