Product Description:

A,Material:plastic POM,Zinc alloy, cold-rolled steel Q235, PA66,spring steel 65Mn

B,Finish:plated(brass + nickel + sealing) , polish, heat treatment

Features: 

A, Upward opening, free stop at any position you want.

B, Simply make a cross conversion, YS309 can be used both on upwards flap doors and downwards flap doors.
C,Adjustment according to the door weight is achieved to get a better function.

Advantages:

A,Make sure the product nonskid & stop steady by using the theory of auto clutch, free stop at any position you want.

B,Having a good stability, opening for a labor-saving, closing without noise,. Adjustable support increases the service life.

C,YS309 passed 50,000 cycles durability test which is far beyond the CNS requirements of hinge- 40,000 times.

Ps:

Difference between YS309, YS310, YS311 and YS312 flay stay:

(1) different design

(2) Internal structure:

YS309 flap stay---friction clutch inside

YS310 flap stay---steel ball and cam construction inside

YS311 flap stay---wheel gear inside 

YS312 flap stay---wheel gear inside