Specifications Precision grade JIS Grade N8 (JIS B 1702-1:1998) JIS Grade 4 (JIS B 1702:1976) Core hardness HB165194 Gear teeth Standard full depth Surface hardness Pressure angle 20 Surface treatment Black oxide Material S45C Surface finish Hobbed Heat treatment - Datum reference surface for gear cutting Bore

S5 S6

Module 2

Catalog No.	Module	No. of teeth	Bore	Hub dia.	Pitch dia.	Outside dia.	Face width	Hub width	Web thickness	Web O.D.	Shape	Allowable torque(kgfm)		Allowable torque(Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	AH7	B	C	D	E	F	H	I		Bending strength	Surface durability	Bending strength	Surface durability
SSA2-20 [ DXF| DWG| 3D CAD] SSA2-24 [ DXF| DWG| 3D CAD] SSA2-25 [ DXF| DWG| 3D CAD] SSA2-28 [ DXF| DWG| 3D CAD] SSA2-30 [ DXF| DWG| 3D CAD]	2 2 2 2 2	20 24 25 28 30	12 12 12 15 15	- - - - -	40 48 50 56 60	44 52 54 60 64	20 20 20 20 20	- - - - -	- - - - -	- - - - -	S5 S5 S5 S5 S5	4.688 6.093 6.451 7.538 8.272	0.2883 0.4322 0.4729 0.6001 0.6935	45.97 59.75 63.26 73.92 81.12	2.827 4.238 4.638 5.885 6.801	0.120.26 0.140.3 0.140.3 0.140.3 0.140.3	0.18 0.27 0.29 0.35 0.42	SSA2-20 SSA2-24 SSA2-25 SSA2-28 SSA2-30
SSA2-32 [ DXF| DWG| 3D CAD] SSA2-35 [ DXF| DWG| 3D CAD] SSA2-36 [ DXF| DWG| 3D CAD] SSA2-40 [ DXF| DWG| 3D CAD] SSA2-45 [ DXF| DWG| 3D CAD]	2 2 2 2 2	32 35 36 40 45	15 15 15 18 18	- - - - -	64 70 72 80 90	68 74 76 84 94	20 20 20 20 20	- - - - -	- - - - -	- - - - -	S5 S5 S5 S5 S5	9.013 10.13 10.51 12.02 13.94	0.7938 0.9575 1.016 1.27 1.628	88.39 99.34 103.1 117.9 136.7	7.784 9.39 9.963 12.45 15.97	0.140.3 0.140.3 0.140.3 0.140.3 0.180.36	0.49 0.58 0.6 0.78 0.96	SSA2-32 SSA2-35 SSA2-36 SSA2-40 SSA2-45
SSA2-48 [ DXF| DWG| 3D CAD] SSA2-50 [ DXF| DWG| 3D CAD] SSA2-55 [ DXF| DWG| 3D CAD] SSA2-56 [ DXF| DWG| 3D CAD] SSA2-60 [ DXF| DWG| 3D CAD]	2 2 2 2 2	48 50 55 56 60	18 18 18 18 18	- - - - -	96 100 110 112 120	100 104 114 116 124	20 20 20 20 20	- - - - -	- - - - -	- - - - -	S5 S5 S5 S5 S5	15.09 15.87 17.81 18.2 19.76	1.866 2.033 2.484 2.58 2.991	148 155.6 174.7 178.5 193.8	18.3 19.94 24.36 25.3 29.33	0.180.36 0.180.36 0.180.36 0.180.36 0.180.36	1.1 1.2 1.5 1.6 1.9	SSA2-48 SSA2-50 SSA2-55 SSA2-56 SSA2-60
SSA2-70 [ DXF| DWG| 3D CAD] SSA2-80 [ DXF| DWG| 3D CAD] SSA2-100 [ DXF| DWG| 3D CAD]	2 2 2	70 80 100	18 18 18	- 70 90	140 160 200	144 164 204	20 20 20	- 4 4	- 12 12	- 136 176	S5 S6 S6	23.7 27.65 29.68	4.161 5.533 7.418	232.4 271.2 291.1	40.81 54.26 72.74	0.180.36 0.180.36 0.220.44	2.6 2.3 3.5	SSA2-70 SSA2-80 SSA2-100

Module 2.5

Catalog No.	Module	No. of teeth	Bore	Hub dia.	Pitch dia.	Outside dia.	Face width	Hub width	Web thickness	Web O.D.	Shape	Allowable torque(kgfm)		Allowable torque(Nm)		Backlash (mm)	Weight (kgf)	Catalog No.
	m	z	AH7	B	C	D	E	F	H	I		Bending strength	Surface durability	Bending strength	Surface durability
SSA2.5-20 [ DXF| DWG| 3D CAD] SSA2.5-24 [ DXF| DWG| 3D CAD] SSA2.5-25 [ DXF| DWG| 3D CAD] SSA2.5-28 [ DXF| DWG| 3D CAD] SSA2.5-30 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	20 24 25 28 30	15 15 15 18 18	- - - - -	50 60 62.5 70 75	55 65 67.5 75 80	25 25 25 25 25	- - - - -	- - - - -	- - - - -	S5 S5 S5 S5 S5	9.156 11.9 12.6 14.72 16.16	0.5768 0.8632 0.9442 1.197 1.385	89.79 116.7 123.6 144.4 158.5	5.656 8.465 9.259 11.74 13.58	0.140.28 0.160.34 0.160.34 0.160.34 0.160.34	0.33 0.52 0.57 0.71 0.82	SSA2.5-20 SSA2.5-24 SSA2.5-25 SSA2.5-28 SSA2.5-30
SSA2.5-32 [ DXF| DWG| 3D CAD] SSA2.5-35 [ DXF| DWG| 3D CAD] SSA2.5-36 [ DXF| DWG| 3D CAD] SSA2.5-40 [ DXF| DWG| 3D CAD] SSA2.5-45 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	32 35 36 40 45	18 18 18 22 22	- - - - -	80 87.5 90 100 112.5	85 92.5 95 105 117.5	25 25 25 25 25	- - - - -	- - - - -	- - - - -	S5 S5 S5 S5 S5	17.6 19.79 20.53 23.49 27.22	1.587 1.918 2.035 2.541 3.255	172.6 194.1 201.3 230.4 266.9	15.56 18.81 19.96 24.92 31.92	0.160.34 0.160.34 0.160.34 0.160.34 0.20.4	0.94 1.1 1.2 1.5 1.8	SSA2.5-32 SSA2.5-35 SSA2.5-36 SSA2.5-40 SSA2.5-45
SSA2.5-48 [ DXF| DWG| 3D CAD] SSA2.5-50 [ DXF| DWG| 3D CAD] SSA2.5-55 [ DXF| DWG| 3D CAD] SSA2.5-56 [ DXF| DWG| 3D CAD] SSA2.5-60 [ DXF| DWG| 3D CAD]	2.5 2.5 2.5 2.5 2.5	48 50 55 56 60	22 22 22 22 22	- - - - 70	120 125 137.5 140 150	125 130 142.5 145 155	25 25 25 25 25	- - - - 5	- - - - 15	- - - - 121	S5 S5 S5 S5 S6	29.48 30.99 34.78 35.55 38.6	3.739 4.081 5.005 5.201 6.027	289.1 303.9 341.1 348.6 378.5	36.67 40.02 49.08 51 59.1	0.20.4 0.20.4 0.20.4 0.20.4 0.20.4	2.1 2.4 2.8 3 2.3	SSA2.5-48 SSA2.5-50 SSA2.5-55 SSA2.5-56 SSA2.5-60
SSA2.5-70 [ DXF| DWG| 3D CAD] SSA2.5-80 [ DXF| DWG| 3D CAD]	2.5 2.5	70 80	22 22	80 90	175 200	180 205	25 25	5 5	15 15	146 171	S6 S6	46.28 45.01	8.369 9.272	453.8 441.4	82.07 90.93	0.20.4 0.20.4	3.9 4.5	SSA2.5-70 SSA2.5-80

CAUTION: When opening the bore to a larger size, please design the maximum bore so that the tooth strength is less than the strength of remaining material. Otherwise the internal stresses on the gear will cause premature failure of the geartrain. The minimum clearance between the bore and the tooth root should be 1.5 times the tooth height.

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.

USEFUL HINT: In general, gears made from S45c have not been heat treated. The end-user can heat-treat these gears as required, but some deformation will be introduced. Ordinarily, a grinding process is needed after heat treatment. Otherwise, the precision of the gear will drop about one grade.

 

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