When we need the o ring,we need to know the d1 and d2.(As the picture)
In fact,nok have a series of naming rules for o ring.
Such as P series
P3~P10 d2 is 1.9mm
P10A~P22 d2 is 2.4mm
P22A~P50 d2 is 3.5mm
P50A~P150 d2 is 5.7mm
And all the P series d1 is the Px=x-0.2mm=d1
For example P18 d2 is 2.4mm d1 is 18-0.2=17.8mm
So it don’t need to measuring the o ring size also can ensure the size.
G25~G145 d2 is 3.1mm
over than G150 d2 is 5.7mm
G series d1 is the Dx=x-0.6mm=d1
For example G30 d2 is 5.7mm d1 is 30-0.6=29.4mm
AS568 series no like the G and P series have the d1 regular.
(maybe i don’t)
AS568 0 d2 is 1.78mm
AS568 1 d2 is 2.62mm
AS568 2 d2 is 3.53mm
AS568 3 d2 is 5.33mm
If there are errors, please correct me!Tks.