How to Install An O-Ring

1. CORRECT SIZE: The right size O-ring is not only important but necessary for applications to function properly. If the O-ring is too small, it will likely tear or break. O-rings that are too large will not provide an adequate seal. Never use force when placing an O-ring. The correct sized part will fit in place easily.
2. AVOID OVERSTRETCHING: Each O-ring has a maximum stretch point. Overstretching can cause O-rings to break or tear during assembly or use. You need to ensure that the stretch does not go beyond the maximum elongation of the O-ring. It’s also important to stretch the O-ring evenly, not just on one side or the other. In general, try to stretch the O-ring as little as possible for a tighter fit.
3. LUBRICATE O-RINGS: A well-lubricated O-ring reduces surface friction and creates a smooth transition for installation. It is essential to choose the right lubricant, and the proper formula will vary based on the type of application as well as the O-ring material. Compatibility with your application is crucial because you don’t want to clog the system filters or cause other complications. Choosing a lubricant compatible with your O-ring will ensure that it does not shrink or swell, influencing how it performs once installed.
4. SLIDE, DON’T ROLL: O-rings should be slid into place on shafts rather than rolled down onto them. Rolling an O-ring into place down a shaft will cause spiralling, which will limit the functionality of the O-ring. A spiral wound O-ring will be easily damaged which may lead to leakage. Slide an O-ring into place by applying a lubricant.
5. EASE O-RINGS OVER THREADS: O-rings are often mated with threaded parts. The threads can easily tear the rubber O-rings. Covering the threads with masking tape during installation and using an assembly lubricant can help protect the O-ring from nicks and tears.
6. KEEP AWAY FROM SHARP EDGES: Some mated parts may also have sharp corners or edges that can damage O-rings. Sometimes these tears are so small they are not visible, resulting in leakage problems later. Avoid forcing O-rings onto sharp corners and edges. Lubricating the O-rings makes it easier to slide them into place.

Our experts in Dublin and Cork are on hand should you need any further assistance in installing an O-ring correctly. Contact us today your seal specialist by email or by phone in Dublin on  (0)1 427 7900 or in Cork on (0)21 500 355.