Basic size of mm

d	2
D	5
B	2.3

The basic rated load is kN

trends C	0.156
static state Co	0.048

Fatigue load limit Pu	0.002

Rated rotation speed is r/min

Refer to the speed	190000
limit speed	95000

Mass kg	0.00018
model	W638/2-2Z

Dimensions are mm

d	2
d1 ～	2.7
D1 ～	4.4
r1,2 min	0.08

Shoulder gear and chamfer size mm

da min	2.5
Da max	4.5
ra max	0.08

Calculation coefficient

kr	0.015
fo	11