Specifications Precision grade JIS Grade N9 (JIS B 1702-1:1998) JIS Grade 5 (JIS B 1702:1976) Gear teeth Standard full depth Pressure angle 20 Material S45C Carbon Steel Heat treatment - Core hardness less than HB194 Surface hardness Surface treatment Black oxide Surface finishing Shaper Cut Datum reference surface for gear cutting Outside diameter

T1

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
SIR2-120 [ DXF| DWG| 3D CAD] SIR2-200 [ DXF| DWG| 3D CAD]	2 2	120 200	236 396	240 400	286 446	20 20	T1 T1	42.13 69.03	7.018 11.18	413.1 676.9	68.82 109.6	0.180.37 0.2 0.41	3 4.8	SIR2-120 SIR2-200

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
SIR2.5-120 [ DXF| DWG| 3D CAD] SIR2.5-200 [ DXF| DWG| 3D CAD]	2.5 2.5	120 200	295 495	300 500	355 555	25 25	T1 T1	82.29 134.8	14.03 22.47	807 1322	137.6 220.4	0.2 0.41 0.220.46	5.5 8.9	SIR2.5-120 SIR2.5-200

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
SIR3-120 [ DXF| DWG| 3D CAD] SIR3-160 [ DXF| DWG| 3D CAD]	3 3	120 160	354 474	360 480	424 544	30 30	T1 T1	142.2 187.5	24.89 32.13	1394 1839	244.1 315.1	0.220.45 0.220.45	10 12.1	SIR3-120 SIR3-160

NOTE: The face width of SSR and SIR corner racks are the same as that of SR, SRF and SRFD racks. By cutting and finishing the ends of corner racks, they can be connected to straight racks with machined ends.

NOTE: The allowable torques shown in the table are calculated based on the assumed usage conditions. All dimensions shown in the above table(s) are listed in millimeters unless otherwise specified.