Hydraulic fittings work by applying a force at one point which is transmitted to another point using an incompressible fluid. In aircraft, this fluid is usually an oil. Landing gear, flaps, and brakes all work using a hydraulic system. High pressure is transmitted through the fluid connected to separate components, therefore the fittings used to construct the hydraulic system must be sturdy and able to withstand high pressures.
O-rings are a specific type of seal that are often used in aircraft hydraulic systems. Valves are paired with o-rings within hydraulic systems due to the additional pressure involved in the hydraulic process. O-rings are more preferable than metal-to-metal fittings because they do not add strain to the thread of a hardware piece. Distortion can occur when a metal fitting has been fastened too tightly. As a result, metal fittings can crack under the additional strain. Unlike metal hardware, o-rings do not tighten over time, therefore do not require the same amount of routine maintenance. A disadvantage of o-rings is that there are not reusable, nor are they interchangeable. Despite having no obvious signs of wear and tear, o-rings must be replaced to avoid any leakages.
Two types of valves that feature in hydraulic systems include, relief valves, and selector valves. In the case of built up fluid pressure, a relief valve can be opened to alleviate the pressure. Selector valves are used to control directional flow.
Hydraulic o-rings were established by the US Air Force-Navy (AN) specification numbers, 6227, 6230, and 6390 for use in fluid at operating temperatures ranging from -65 °F to over 160 °F. Since then, newer compounds have been developed using military standard. The MS standard for o-rings operating in a temperature range of -65 °F to 275 °F are the MS28775 and the MS28778. The rings are made from nitrile butadiene rubber, which is resistant to petroleum-based hydraulic fluid.
We at, ASAP NSN Hub, owned and operated by ASAP Semiconductor, supply hydraulic fittings worldwide. We supply hydraulic fittings that are manufactured to AN, NAS, and MS standards. Use our optimized search engine to find the exact part you need.
Part No | Category Type | Description | QTY | RFQ |
---|---|---|---|---|
AN6289 | an fitting | nut, flared tube, universal fitting | Avl | RFQ |
AN774 | an fitting | bolt, tube fitting end, universal | Avl | RFQ |
AN775 | an fitting | bolt, universal fitting | Avl | RFQ |
AN776 | an fitting | elbow, universal, 90º | Avl | RFQ |
AN777 | an fitting | elbow, universal, 75º | Avl | RFQ |
AN778 | an fitting | elbow, universal, 45º | Avl | RFQ |
AN779 | an fitting | tee, universal fitting | Avl | RFQ |
AN780 | an fitting | nipple, union | Avl | RFQ |
AN783 / MS24388 | an fitting | tee, flared tube, internal thread on side | Avl | RFQ |
AN784 / MS24389 | an fitting | tee, flared tube, internal thread on run | Avl | RFQ |
AN785 | an fitting | coupling, union, brazing | Avl | RFQ |
AN800 | an fitting | union, cone | Avl | RFQ |
AN804 / MS24390 | an fitting | tee, flared tube with bulkhead on run | Avl | RFQ |
AN805 | an fitting | nut, union | Avl | RFQ |
AN806 / MS24404 | an fitting | plug, flared tube | Avl | RFQ |
AN807 | an fitting | adapter, hose to universal | Avl | RFQ |
AN814L (SHOWN) / MS2 | an fitting | plug and bleeder, screw thread | Avl | RFQ |
AN815 / MS24392 | an fitting | union, flared tube | Avl | RFQ |
AN816 | an fitting | nipple, flared tube and pipe thread | Avl | RFQ |
AN817 | an fitting | nut, sleeve coupling | Avl | RFQ |
AN818 | an fitting | nut, coupling | Avl | RFQ |
AN821 / MS24401 | an fitting | elbow, flared tube, 90º | Avl | RFQ |
AN822 / MS20822 | an fitting | elbow, flared tube and pipe thread, 90º | Avl | RFQ |
AN823 / MS20823 | an fitting | elbow, flared tube and pipe thread, 45º | Avl | RFQ |
AN824 / MS24402 | an fitting | tee, flared tube | Avl | RFQ |
AN825 / MS20825 | an fitting | tee, flared tube with pipe thread on side | Avl | RFQ |
AN826 / MS20826 | an fitting | tee, flared tube with pipe thread on run | Avl | RFQ |
AN827 / MS24403 | an fitting | cross, flared tube | Avl | RFQ |
AN832 / MS24393 | an fitting | union, flared tube, bulkhead and universal | Avl | RFQ |
AN833 / MS24394 | an fitting | elbow, flared tube and bulkhead universal, 90º | Avl | RFQ |
AN834 / MS24395 | an fitting | tee, bulkhead universal, flared tube | Avl | RFQ |
AN837 / MS24396 | an fitting | elbow, flared tube and universal, 45º | Avl | RFQ |
AN838 | an fitting | elbow, hose to universal, 90º | Avl | RFQ |
AN839 | an fitting | elbow, hose to universal, 45º | Avl | RFQ |
AN840 | an fitting | adapter, hose to pipe thread | Avl | RFQ |
AN841 | an fitting | adapter, hose to flared tube | Avl | RFQ |
AN842 | an fitting | elbow, pipe thread and hose, 90º | Avl | RFQ |
AN844 | an fitting | elbow, pipe thread and hose, 45º | Avl | RFQ |
AN849 | an fitting | connector, hose, bulkhead | Avl | RFQ |
AN871 | an fitting | flange, straight thread, boss welding | Avl | RFQ |
AN893 / MS24397 | an fitting | bushing, screw thread, reducing | Avl | RFQ |
AN894 / MS24398 | an fitting | bushing, screw thread, expander | Avl | RFQ |
AN910 | an fitting | coupling, pipe thread | Avl | RFQ |
AN911 | an fitting | nipple, pipe thread | Avl | RFQ |
AN912 | an fitting | reducer, pipe bushing | Avl | RFQ |
AN914 | an fitting | elbow, internal and external pipe thread, 90º | Avl | RFQ |
AN915 | an fitting | elbow, internal and external pipe thread, 45º | Avl | RFQ |
AN916 | an fitting | elbow, internal pipe thread, 90ºº | Avl | RFQ |
AN917 | an fitting | tee, internal pipe thread | Avl | RFQ |
AN918 | an fitting | cross, internal pipe thread | Avl | RFQ |
AN919 / MS24399 | an fitting | reducer, external thread, flared tube | Avl | RFQ |
AN924 / MS24400 | an fitting | nut, flared tube, bulkhead and universal fitting | Avl | RFQ |
AN929 | an fitting | cap assembly, pressure seal flared tube fitting | Avl | RFQ |
AN932 | an fitting | plug, counter sink, hex head type | Avl | RFQ |
AN933 | an fitting | plug, pipe, hex head | Avl | RFQ |
AN937 | an fitting | cross, internal screw thread | Avl | RFQ |
AN938 | an fitting | tee, internal screw thread | Avl | RFQ |
AN939 | an fitting | elbow, internal screw thread, 90º | Avl | RFQ |
AN941 | an fitting | elbow, internal screw thread, 45º | Avl | RFQ |
MS20757-12D | ms fitting | connector, fixed flange to hose | Avl | RFQ |
MS20759-24D | ms fitting | elbow, hose, flanged swivel, 90° | Avl | RFQ |
MS20760-16K | ms fitting | adapter, straight, flange to tube | Avl | RFQ |
MS20761-12D | ms fitting | elbow, flared tube, flanged, swivel, 45º | Avl | RFQ |
MS20762-16D | ms fitting | elbow, flared tube, flanged, swivel, 90º | Avl | RFQ |
MS20819 / AS5176 OR | ms fitting | sleeve, flared tube fitting | Avl | RFQ |
MS20913 / AS4863 | ms fitting | plug, pipe | Avl | RFQ |
MS21900 / AS21900 | ms fitting | adapter, flareless tube to a flared tube | Avl | RFQ |
MS21902 / AS21902 | ms fitting | union, flareless tube | Avl | RFQ |
MS21903 / AS21924 | ms fitting | union, flareless tube, 3/8 bulkhead and universal | Avl | RFQ |
MS21904 / AS21904 | ms fitting | elbow, flareless tube, 90º | Avl | RFQ |
MS21905 / AS21905 | ms fitting | tee, flareless tube | Avl | RFQ |
MS21906 / AS21906 | ms fitting | cross, flareless tube | Avl | RFQ |
MS21907 / AS219097 | ms fitting | elbow, bulkhead universal, 45º, flareless tube | Avl | RFQ |
MS21908 / AS21908 | ms fitting | elbow, bulkhead universal 90º, flareless tube | Avl | RFQ |
MS21909 / AS21909 | ms fitting | tee, bulkhead and universal, flareless tube | Avl | RFQ |
MS21910 / AS21910 | ms fitting | tee, bulkhead, flareless tube, internal thread on side | Avl | RFQ |
MS21911 / AS21911 | ms fitting | tee, bulkhead, flareless tube, internal thread on run | Avl | RFQ |
MS21912 / AS21912 | ms fitting | tee, flareless tube with bulkhead on run | Avl | RFQ |
MS21913 / AS21913 | ms fitting | plug, flareless tube | Avl | RFQ |
MS21914 / AS21914 | ms fitting | cap, pressure seal, flareless tube fitting | Avl | RFQ |
MS21915 / AS21915 | ms fitting | adapter, straight, tube to boss | Avl | RFQ |
MS21916 / AS21916 | ms fitting | reducer, external thread, flareless tube | Avl | RFQ |
MS21921 / AS21921 | ms fitting | nut, sleeve coupling, flareless | Avl | RFQ |
MS21922 / AS21922 | ms fitting | sleeve, coupling, flareless | Avl | RFQ |
MS21923 / AS21923 | ms fitting | adapter, flareless tube, bulkhead and universal to flared tube | Avl | RFQ |
MS21924 / AS21924 | ms fitting | union, flareless tube, bulkhead and universal | Avl | RFQ |
MS21925 / AS21925 | ms fitting | elbow, 90º universal, flareless tube, high profile (asg) | Avl | RFQ |
MS21926 / AS21926 | ms fitting | elbow, 90º. universal, flareless tube, low profile | Avl | RFQ |
NAS1761 | nas fitting | elbow, reducer, 45º, flareless tube to swivel | Avl | RFQ |
NAS1762 | nas fitting | elbow, reducer, 90º, flareless tube to swivel | Avl | RFQ |
NAS1763 | nas fitting | tee, reducer, flareless tube to swivel on run | Avl | RFQ |
NAS1764 | nas fitting | tee, reducer, swivel, flareless tube on runs | Avl | RFQ |
NAS424 | nas fitting | coupling - tube flared fitting, female thread | Avl | RFQ |
NAS551 | nas fitting | bolt-universal fitting | Avl | RFQ |
NAS552 | nas fitting | elbow, universal, 90º | Avl | RFQ |
NAS553 | nas fitting | elbow, universal, 90º | Avl | RFQ |
NAS554 | nas fitting | elbow, universal, 45º | Avl | RFQ |
NAS555 | nas fitting | cross, universal, tube flared ends | Avl | RFQ |
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