Specifications Precision grade JIS B 1704 grade 4 Core hardness HB165194 Gear teeth Gleason Surface hardness HRC4853 Pressure angle 20 Surface treatment Black oxide Helix angle - Surface finish Cut Material S45 (Carbon steel) Datum reference surface for gear cutting Bore Heat treatment Teeth induction hardened

B3

20 Miter Module 18

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 Keyway Threaded hole Shape Allowable torque (kgfm) Allowable torque (Nm) Backlash (mm) Weight (kgf) Catalog No. m z AH7 B C D E F G H I J K L WidthDepth M Thread size Bending strength Surface durability Bending strength Surface durability SMA1-20 [ DXF| DWG| 3D CAD] SMB1-20 [ DXF| DWG| 3D CAD] 1 20 8 10 16 20 21.41 20 13.95 10.71 8 12 12.07 5 9.86 10 4948' - - 4 M4 B3 0.0913 0.0376 0.8953 0.3687 0.030.13 0.015 0.015 SMA1-20 SMB1-20 SMA1.5-20 [ DXF| DWG| 3D CAD] SMB1.5-20 [ DXF| DWG| 3D CAD] 1.5 20 10 12 26 30 32.12 30 21.24 16.06 13 19 8 15.37 4948' - 41.8 6.5 M4 M5 B3 0.3194 0.1338 3.132 1.312 0.050.15 0.07 0.07 SMA1.5-20 SMB1.5-20 SMA2-20 [ DXF| DWG| 3D CAD] SMB2-20 [ DXF| DWG| 3D CAD] 2 20 14 15 34 40 42.83 37 24.89 18.41 14 22 10 21.72 4948' 52.3 * 52.3 7 M5 B3 0.7306 0.3105 7.165 3.045 0.060.16 0.14 0.14 SMA2-20 SMB2-20 SMA2.5-20 [ DXF| DWG| 3D CAD] SMB2.5-20 [ DXF| DWG| 3D CAD] 2.5 20 18 20 42 50 53.54 48 32.54 24.77 19 29 12 28.06 4948' 52.3 62.8 9.5 M6 B3 1.393 0.6012 13.66 5.896 0.070.17 0.28 0.25 SMA2.5-20 SMB2.5-20 SMA3-20 [ DXF| DWG| 3D CAD] SMB3-20 [ DXF| DWG| 3D CAD] SMC3-20 [ DXF| DWG| 3D CAD] 3 20 22 25 20 50 60 64.24 58 39.84 30.12 23 35 15 31.57 4948' 73 * 73 * 62.8 11.5 M6 M8 M6 B3 2.466 1.075 24.18 10.54 0.080.18 0.41 0.39 0.5 SMA3-20 SMB3-20 SMC3-20 SMA3.5-20 [ DXF| DWG| 3D CAD] SMB3.5-20 [ DXF| DWG| 3D CAD] 3.5 20 28 30 60 70 74.95 65 44.13 32.47 25 40 18 39.09 4948' 73 * 83.3 12.5 M8 B3 3.978 1.749 39.01 17.15 0.10.25 0.7 0.65 SMA3.5-20 SMB3.5-20 SMA4-20 [ DXF| DWG| 3D CAD] SMB4-20 [ DXF| DWG| 3D CAD] SMC4-20 [ DXF| DWG| 3D CAD] 4 20 30 32 25 64 80 85.65 75 50.78 37.83 27 45 20 43.43 4948' 73 * 103.3 83.3 13.5 M8 B3 5.845 2.59 57.32 25.4 0.120.27 1 1 1.1 SMA4-20 SMB4-20 SMC4-20 SMA5-20 [ DXF| DWG| 3D CAD] SMB5-20 [ DXF| DWG| 3D CAD] SMC5-20 [ DXF| DWG| 3D CAD] 5 20 40 30 35 80 100 107.07 90 60.38 43.54 30 54 26 54.46 4948' 103.3 * 83.3 103.3 15 M8 B3 11.67 5.228 114.4 51.27 0.140.34 2 2.1 2 SMA5-20 SMB5-20 SMC5-20 SMA6-20 [ DXF| DWG| 3D CAD] SMB6-20 [ DXF| DWG| 3D CAD] SMC6-20 [ DXF| DWG| 3D CAD] 6 20 45 50 40 100 120 128.48 104 67.67 48.24 34 60 30 67.15 4948' 123.3 * 143.8 123.3 17 M8 B3 19.33 8.919 189.6 87.46 0.160.36 3.4 3.3 3.5 SMA6-20 SMB6-20 SMC6-20 SMA8-20 [ DXF| DWG| 3D CAD] 8 20 60 130 160 171.31 125 73.33 50.66 30 62 35 95 4948' 184.4 15 M10 B3 41.41 19.77 406.1 193.9 0.20.45 6 SMA8-20

Pitch Angle 45

CAUTION:	SMA, SMB and SMC gears are identical in all features except for bore and keyway dimensions.
CAUTION:	Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips.
NOTE:	The keyway dimensions of items with "*" marks do not conform to JIS standard.
NOTE:	A set screw comes with these products.
NOTE:	The allowable torques shown in the table are calculated according to JGMA Standards 403-01 and 404-01.
USEFUL HINT :	Miter gears are bevel gears with a 1 : 1 gear ratio. There are two types, straight miter and spiral miter, according to straight or curved gear tooth.

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