Introduction to aircraft_o_rings
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O-rings are sealing devices that prevent the escape of fluids or vapors by seating into depressions when pressure is applied. There are two main types of O-rings: boss O-rings, which are static and don't move, and gland O-rings, which are dynamic and move. Boss O-rings for aircraft fittings follow a standard dash numbering system where the size corresponds to the fitting, such as a -2 fitting using a -902 O-ring. It is important to carefully inspect O-rings before installing to check for defects.
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Introduction to aircraft_o_rings
- 1. Aircraft O-Rings An o-ring is a pressure-energized sealing device for closing off a passageway preventing an unwanted escape or loss of fluid or vapor. Pressure tends to seat the o-ring material into minor depressions in the surfaces of the gland. www.mechanicsupport.com
- 2. Boss o-rings (static - non moving) O-ring types Gland o-rings (dynamic - moving) Each type has its own size designation. For example, a size -10 boss o-ring is a different size than a -10 gland o-ring.
- 3. How to select the proper O-ring Type: boss or gland Material: wide range of choices Size: use chart for boss or gland O-ring hat - the easy way Measuring - the hard way
- 4. Sizing Boss O-rings for Aircraft AN Fittings A dash -2 fitting takes a -902 o-ring -4 takes a -904 o-ring -6 takes a -906 o-ring and so on. The 9 in the size tells you that this is a boss o-ring size. Simple isn't it? However ! A big one here - most catalogs remove the 9 and sometimes the zero in the size. So 904 is listed as a -04 or a -4! Awful isn't it. When we use an o-ring on straight threads in aircraft, the boss that accepts the fitting and o-ring is a MS33649 Boss. For many years this was a AND10050 boss and is still described as such.
- 5. So if they remove the 904 how do you know if it is a boss o-ring? By part number: Here are some common aircraft boss o-ring numbers. MS9020 Aircraft Fuel MS29512 Aircraft Jet Fuel MS28778 Aircraft 5606 "red" hydraulic fluid
- 7. Inspect before you Install Inspect for manufacturing defects by sliding the o-ring gently through your finger tips. If you feel any bumps or rough spots then throw that o-ring away (first cut it in half to prevent inadvertent use).
- 8. Aircraft O-ring Packaging Aircraft o-rings are individually packaged for identification, preservation, cleanliness, and age control.