DUBO Retaining Ring for Socket Head Screws

The specifications of DUBO Retaining Rings used in conjunction with steel collar rings also apply in principle for DUBO Retaining Rings for socket head screws. It is the same ring design, but with special dimensions to suit socket head screws.

To ensure reliable locking and sealing of the screw, it is important to observe the following points on assembly:

1. The screw should be tightened until the outer reinforcing rim of the ring is distorted and has engaged around the head of the screw. The screw generally then has the right initial stress. Because the material of the ring slides over the surface of the surrounding component, it feels as if the screw still needs further tightening, but this is not so. The required initial stress is obtained immediately on distortion of the ring and the screw is then completely locked. Further tightening of the screw is harmful.

2. As smooth a finish as possible on the bearing surface of the component improves the locking and sealing.

3. The correct diameter of the ring should be used for each thread diameter.

4. To obtain complete sealing the female threads should be of correct size or below, in accordance with DIN standard No. 69.

5. Where the DUBO Retaining Ring is used with a steel collar ring the screw can be tightened up to any permitted torque value.

Lock and seal
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