The function of the stop pin
1.Reduce the contact surface betwwen ejector plates and clamping plates,it is easy to control the flatness of ejector plates by adjusting the thickness of stop pins.
2.Buffer against ejector plates
The material of stop pin
S45C，hardness HRC40°~45°
Position of stop pin
1.An STP must be installed under the RP to prevent deformation caused by large stress,see pic 1#
2. Avoid to interfere with other mold components,such as support,EGP,KO .etc. see pic 2#
The quantity of stop pins
Note:For a large size plastic injection mold, Stop pin is needed to increase the supporting points of the ejector backing plate, so as to prevent ejector plates from deformation