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1.HSS material M1, 2.PA20 m3 110x110x40mm, 3.Class A and B in your choice, 4.ISO9001-2008 - details see: https://www.machineto.com/pa30-m1-2-5-involute-spline-hob-gear-hobbing-tool-10147369

Involute Spline Hob, GW15-B1-003 m1 α=30° ClassA,ClassB

MODULE	OUTSIDE DIAMETER	LENGTH	DIAMETER OF HOLE
1	50	35	22
1.25		40
1.5		50
1.75	63	63	27
2
2.5
3	71	71
3.5
4	80	80	32
5	90	90
6	100	100
8	112	112	40
10	125	125

There is still another KIND OF THIS whose angle isα=45°, and its work details are as followed:

MODULE	OUTSIDE DIAMETER	LENGTH	DIAMETER OF HOLE
1	40	35	16
1.25
1.5	50	40	22
1.75
2
2.5	55	45

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