This type of lock is used, just like the inner lock, to lock the rotation of the piston ring in the groove.
Access from the side makes the pin that falls into the opening of the side lock easier to insert than the inner lock. We often encounter this type in two-stroke and old diesel engines. Sometimes it is necessary for the piston ring not to rotate with a rotating application. We use this type of lock to achieve this.
Euroring designation = Type H DIN ISO Designation = NE1 to NE3