Specifications Precision grade JIS Grade N8 (JIS B 1702-1:1998) JIS Grade 4 (JIS B 1702:1976) Gear teeth Standard full depth Pressure angle 20 Material S45c Carbon Steel Heat treatment - Core hardness HB165194 Surface hardness Surface treatment Black oxide Surface finishing Shaper Cut Datum reference surface for gear cutting Outside diameter

T1

Module 1

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Catalog No.	Module	No. of teeth	Internal dia.	Pitch dia.	Outside dia. of ring	Face width	Shape	Allowable torque (kgfm)		Allowable torque (Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	A	C	D	E		Bending strength	Surface durability	Bending strength	Surface durability
SI1-60 [ DXF| DWG| 3D CAD] SI1-80 [ DXF| DWG| 3D CAD] SI1-100 [ DXF| DWG| 3D CAD]	1 1 1	60 80 100	58 78 98	60 80 100	90 110 130	10 10 10	T1 T1 T1	3.062 3.96 4.874	0.6065 0.6722 0.7795	30.03 38.83 47.8	5.948 6.592 7.644	0.130.24 0.130.24 0.140.27	0.28 0.35 0.42	SI1-60 SI1-80 SI1-100

Module 1.5

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Catalog No.	Module	No. of teeth	Internal dia.	Pitch dia.	Outside dia. of ring	Face width	Shape	Allowable torque (kgfm)		Allowable torque (Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	A	C	D	E		Bending strength	Surface durability	Bending strength	Surface durability
SI1.5-50 [ DXF| DWG| 3D CAD] SI1.5-60 [ DXF| DWG| 3D CAD] SI1.5-80 [ DXF| DWG| 3D CAD] SI1.5-100 [ DXF| DWG| 3D CAD]	1.5 1.5 1.5 1.5	50 60 80 100	72 87 117 147	75 90 120 150	115 130 160 190	15 15 15 15	T1 T1 T1 T1	8.878 10.33 13.36 16.45	2.132 2.1 2.376 2.75	87.06 101.3 131 161.3	20.91 20.59 23.3 26.97	0.150.29 0.150.29 0.150.29 0.170.32	0.71 0.81 1 1.3	SI1.5-50 SI1.5-60 SI1.5-80 SI1.5-100

Module 2

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Catalog No.	Module	No. of teeth	Internal dia.	Pitch dia.	Outside dia. of ring	Face width	Shape	Allowable torque (kgfm)		Allowable torque (Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	A	C	D	E		Bending strength	Surface durability	Bending strength	Surface durability
SI2-50 [ DXF| DWG| 3D CAD] SI2-60 [ DXF| DWG| 3D CAD] SI2-80 [ DXF| DWG| 3D CAD] SI2-100 [ DXF| DWG| 3D CAD]	2 2 2 2	50 60 80 100	96 116 156 196	100 120 160 200	150 170 210 250	20 20 20 20	T1 T1 T1 T1	21.04 24.49 31.68 38.99	5.129 5.149 5.812 6.7	206.3 240.2 310.7 382.4	50.3 50.49 57 65.7	0.160.33 0.160.33 0.160.33 0.180.37	1.5 1.8 2.3 2.8	SI2-50 SI2-60 SI2-80 SI2-100

Module 2.5

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Catalog No.	Module	No. of teeth	Internal dia.	Pitch dia.	Outside dia. of ring	Face width	Shape	Allowable torque (kgfm)		Allowable torque (Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	A	C	D	E		Bending strength	Surface durability	Bending strength	Surface durability
SI2.5-50 [ DXF| DWG| 3D CAD] SI2.5-60 [ DXF| DWG| 3D CAD] SI2.5-80 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5	50 60 80	120 145 195	125 150 200	185 210 260	25 25 25	T1 T1 T1	41.1 47.84 61.87	10.26 10.31 11.6	403 469.1 606.7	100.6 101.1 113.8	0.180.37 0.180.37 0.180.37	2.7 3.3 4.1	SI2.5-50 SI2.5-60 SI2.5-80

Module 3

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Catalog No.	Module	No. of teeth	Internal dia.	Pitch dia.	Outside dia. of ring	Face width	Shape	Allowable torque (kgfm)		Allowable torque (Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	A	C	D	E		Bending strength	Surface durability	Bending strength	Surface durability
SI3-50 [ DXF| DWG| 3D CAD] SI3-60 [ DXF| DWG| 3D CAD]	3 3	50 60	144 174	150 180	220 250	30 30	T1 T1	71.02 82.67	18.1 18.19	696.5 810.7	177.5 178.4	0.2 0.41 0.2 0.41	4.8 5.6	SI3-50 SI3-60

CAUTION: There are many interference problems that can occur when meshing a pinion and an internal gear, preventing the gears from operating smoothly. Please consult the technical section for more information.

CAUTION: Please check for the involute interference, trochoid interference and trimming interference prior to using internal gears in any planetary or cycloidal operation.

NOTE: The allowable torques shown in the table are the calculated values according to JGMA Standards 401-01 and 402-02. The backlash values shown in the table are the theoretical values when the internal gears are meshed with a 30 tooth SS type spur gear. All dimensions shown in the above table(s) are listed in millimeters unless otherwise specified.