Basic size of mm

d	66.675
D	112.712
T	30.162

The basic rated load is kN

trends C	123
static state Co	183

Fatigue load limit Pu	21.2

Rated rotation speed is r/min

Refer to the speed	4300
limit speed	6000

quality	1.15
model	3984/2/3920/2/Q
series	3900

Dimensions are mm

d	66.675
d1 ～	87.8
B	30.048
C	23.812
r1,2 min	3.5
r3,4 min	3.3
a	25

Shoulder gear and chamfer size mm

Da max	75
db min	78.5
Da min	96
Da max	101
Db min	105
Ca min	4
Cb min	6
ra max	3
rb max	3

Calculation coefficient

e	0.4
Y	1.5
Yo	0.8