Specifications Precision grade JIS Grade N9 (JIS B 1702-1:1998) JIS Grade 5 (JIS B 1702:1976) Core hardness HRR115120 Gear teeth Standard full depth Surface hardness Pressure angle 20 Surface treatment - Material MC601st Nylon with S45c Steel core Surface finish Hobbed Heat treatment - Datum reference surface for gear cutting Bore

S1

Module 2.5

Catalog No.	Module	No. of teeth	Bore	Hub dia.	Pitch dia.	Outside dia.	Face width	Hub width	Total length	Metal core dia.	Shape	Allowable torque(kgfm)	Allowable torque(Nm)	Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	AH7	B	C	D	E	F	G	H		Bending strength	Bending strength
NSU2.5-18 [ DXF| DWG| 3D CAD] NSU2.5-20 [ DXF| DWG| 3D CAD] NSU2.5-22 [ DXF| DWG| 3D CAD] NSU2.5-24 [ DXF| DWG| 3D CAD] NSU2.5-25 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	18 20 22 24 25	12 12 12 12 12	25 28 35 35 35	45 50 55 60 62.5	50 55 60 65 67.5	25 25 25 25 25	15 15 15 15 15	40 40 40 40 40	25 28 35 35 35	S1 S1 S1 S1 S1	1.165 1.349 1.525 1.702 1.798	11.42 13.23 14.95 16.69 17.63	0.20.36 0.20.36 0.220.38 0.220.38 0.220.38	0.15 0.2 0.31 0.33 0.33	NSU2.5-18 NSU2.5-20 NSU2.5-22 NSU2.5-24 NSU2.5-25
NSU2.5-28 [ DXF| DWG| 3D CAD] NSU2.5-30 [ DXF| DWG| 3D CAD] NSU2.5-32 [ DXF| DWG| 3D CAD] NSU2.5-34 [ DXF| DWG| 3D CAD] NSU2.5-35 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	28 30 32 34 35	12 12 12 12 12	40 45 45 50 55	70 75 80 85 87.5	75 80 85 90 92.5	25 25 25 25 25	15 15 15 15 15	40 40 40 40 40	40 50 50 55 60	S1 S1 S1 S1 S1	2.073 2.254 2.448 2.647 2.75	20.33 22.1 24.01 25.96 26.97	0.220.38 0.220.38 0.220.38 0.220.38 0.220.38	0.44 0.62 6.53 0.76 0.9	NSU2.5-28 NSU2.5-30 NSU2.5-32 NSU2.5-34 NSU2.5-35
NSU2.5-36 [ DXF| DWG| 3D CAD] NSU2.5-40 [ DXF| DWG| 3D CAD] NSU2.5-44 [ DXF| DWG| 3D CAD] NSU2.5-45 [ DXF| DWG| 3D CAD] NSU2.5-48 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	36 40 44 45 48	12 15 15 15 15	55 65 65 65 65	90 100 115 112.5 120	95 105 115 117.5 125	25 25 25 25 25	15 15 15 15 15	40 40 40 40 40	60 70 75 75 85	S1 S1 S1 S1 S1	2.854 3.258 3.665 3.769 4.086	27.99 31.95 35.94 36.96 40.07	0.220.38 0.220.38 0.240.4 0.240.4 0.240.4	0.91 1.2 1.35 1.4 1.6	NSU2.5-36 NSU2.5-40 NSU2.5-44 NSU2.5-45 NSU2.5-48
NSU2.5-50 [ DXF| DWG| 3D CAD] NSU2.5-56 [ DXF| DWG| 3D CAD] NSU2.5-60 [ DXF| DWG| 3D CAD] NSU2.5-68 [ DXF| DWG| 3D CAD] NSU2.5-70 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	50 56 60 68 70	15 15 20 20 20	65 65 70 70 70	125 140 150 170 175	130 145 155 175 180	25 25 25 25 25	15 15 15 15 15	40 40 40 40 40	95 105 115 135 140	S1 S1 S1 S1 S1	4.302 4.898 5.304 6.11 6.315	42.19 48.03 52.01 59.92 61.93	0.240.4 0.240.4 0.240.4 0.240.4 0.240.4	1.9 2.23 2.6 3.41 3.63	NSU2.5-50 NSU2.5-56 NSU2.5-60 NSU2.5-68 NSU2.5-70

CAUTION: Although the holding strength at the material interface is designed to be stronger than the teeth, a secondary operation may weaken the holding strength.

CAUTION: When the core O.D. is the same as the hub diameter, you may see some serration on the hub. There is no effect on the strength of the gear due to these serrations.

NOTE: The allowable torques shown in the table are calculated using the Lewis formula. The backlash values shown are the theoretical values of a pair of identical gears in mesh. All dimensions shown in the above table(s) are listed in millimeters unless otherwise specified.

 

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