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 |
---|---|---|---|---|
AN780 | an fitting | nipple, union | Avl | RFQ |
AN840 | an fitting | adapter, hose to pipe thread | Avl | RFQ |
MS21903 / AS21924 | ms fitting | union, flareless tube, 3/8 bulkhead and universal | Avl | RFQ |
AN818 | an fitting | nut, coupling | Avl | RFQ |
NAS1763 | nas fitting | tee, reducer, flareless tube to swivel on run | Avl | RFQ |
AN914 | an fitting | elbow, internal and external pipe thread, 90º | Avl | RFQ |
AN838 | an fitting | elbow, hose to universal, 90º | Avl | RFQ |
AN778 | an fitting | elbow, universal, 45º | Avl | RFQ |
AN916 | an fitting | elbow, internal pipe thread, 90ºº | Avl | RFQ |
AN841 | an fitting | adapter, hose to flared tube | Avl | RFQ |
AN912 | an fitting | reducer, pipe bushing | Avl | RFQ |
MS21907 / AS219097 | ms fitting | elbow, bulkhead universal, 45º, flareless tube | Avl | RFQ |
MS21922 / AS21922 | ms fitting | sleeve, coupling, flareless | Avl | RFQ |
AN839 | an fitting | elbow, hose to universal, 45º | Avl | RFQ |
MS21910 / AS21910 | ms fitting | tee, bulkhead, flareless tube, internal thread on side | Avl | RFQ |
AN894 / MS24398 | an fitting | bushing, screw thread, expander | Avl | RFQ |
AN849 | an fitting | connector, hose, bulkhead | Avl | RFQ |
AN932 | an fitting | plug, counter sink, hex head type | Avl | RFQ |
MS20761-12D | ms fitting | elbow, flared tube, flanged, swivel, 45º | Avl | RFQ |
MS21916 / AS21916 | ms fitting | reducer, external thread, flareless tube | Avl | RFQ |
NAS424 | nas fitting | coupling - tube flared fitting, female thread | Avl | RFQ |
AN871 | an fitting | flange, straight thread, boss welding | Avl | RFQ |
AN779 | an fitting | tee, universal fitting | Avl | RFQ |
MS21912 / AS21912 | ms fitting | tee, flareless tube with bulkhead on run | Avl | RFQ |
MS21913 / AS21913 | ms fitting | plug, flareless tube | Avl | RFQ |
AN844 | an fitting | elbow, pipe thread and hose, 45º | Avl | RFQ |
AN776 | an fitting | elbow, universal, 90º | Avl | RFQ |
AN833 / MS24394 | an fitting | elbow, flared tube and bulkhead universal, 90º | Avl | RFQ |
AN826 / MS20826 | an fitting | tee, flared tube with pipe thread on run | Avl | RFQ |
MS21908 / AS21908 | ms fitting | elbow, bulkhead universal 90º, flareless tube | Avl | RFQ |
MS20819 / AS5176 OR | ms fitting | sleeve, flared tube fitting | Avl | RFQ |
AN783 / MS24388 | an fitting | tee, flared tube, internal thread on side | Avl | RFQ |
MS21921 / AS21921 | ms fitting | nut, sleeve coupling, flareless | Avl | RFQ |
AN915 | an fitting | elbow, internal and external pipe thread, 45º | Avl | RFQ |
AN938 | an fitting | tee, internal screw thread | Avl | RFQ |
MS20913 / AS4863 | ms fitting | plug, pipe | Avl | RFQ |
AN911 | an fitting | nipple, pipe thread | Avl | RFQ |
AN918 | an fitting | cross, internal pipe thread | Avl | RFQ |
AN817 | an fitting | nut, sleeve coupling | Avl | RFQ |
MS21905 / AS21905 | ms fitting | tee, flareless tube | Avl | RFQ |
AN807 | an fitting | adapter, hose to universal | Avl | RFQ |
AN800 | an fitting | union, cone | Avl | RFQ |
AN924 / MS24400 | an fitting | nut, flared tube, bulkhead and universal fitting | Avl | RFQ |
AN774 | an fitting | bolt, tube fitting end, universal | Avl | RFQ |
MS20760-16K | ms fitting | adapter, straight, flange to tube | Avl | RFQ |
NAS1764 | nas fitting | tee, reducer, swivel, flareless tube on runs | Avl | RFQ |
AN822 / MS20822 | an fitting | elbow, flared tube and pipe thread, 90º | Avl | RFQ |
AN805 | an fitting | nut, union | Avl | RFQ |
AN815 / MS24392 | an fitting | union, flared tube | Avl | RFQ |
AN937 | an fitting | cross, internal screw thread | Avl | RFQ |
AN933 | an fitting | plug, pipe, hex head | Avl | RFQ |
NAS554 | nas fitting | elbow, universal, 45º | Avl | RFQ |
AN777 | an fitting | elbow, universal, 75º | Avl | RFQ |
MS21924 / AS21924 | ms fitting | union, flareless tube, bulkhead and universal | Avl | RFQ |
NAS552 | nas fitting | elbow, universal, 90º | Avl | RFQ |
AN939 | an fitting | elbow, internal screw thread, 90º | Avl | RFQ |
AN919 / MS24399 | an fitting | reducer, external thread, flared tube | Avl | RFQ |
AN823 / MS20823 | an fitting | elbow, flared tube and pipe thread, 45º | Avl | RFQ |
AN837 / MS24396 | an fitting | elbow, flared tube and universal, 45º | Avl | RFQ |
AN824 / MS24402 | an fitting | tee, flared tube | Avl | RFQ |
AN814L (SHOWN) / MS2 | an fitting | plug and bleeder, screw thread | Avl | RFQ |
MS21902 / AS21902 | ms fitting | union, flareless tube | Avl | RFQ |
AN941 | an fitting | elbow, internal screw thread, 45º | Avl | RFQ |
AN842 | an fitting | elbow, pipe thread and hose, 90º | Avl | RFQ |
MS20757-12D | ms fitting | connector, fixed flange to hose | Avl | RFQ |
NAS1761 | nas fitting | elbow, reducer, 45º, flareless tube to swivel | Avl | RFQ |
AN832 / MS24393 | an fitting | union, flared tube, bulkhead and universal | Avl | RFQ |
AN816 | an fitting | nipple, flared tube and pipe thread | Avl | RFQ |
MS21914 / AS21914 | ms fitting | cap, pressure seal, flareless tube fitting | Avl | RFQ |
MS21926 / AS21926 | ms fitting | elbow, 90º. universal, flareless tube, low profile | Avl | RFQ |
AN893 / MS24397 | an fitting | bushing, screw thread, reducing | Avl | RFQ |
AN834 / MS24395 | an fitting | tee, bulkhead universal, flared tube | Avl | RFQ |
AN827 / MS24403 | an fitting | cross, flared tube | Avl | RFQ |
AN806 / MS24404 | an fitting | plug, flared tube | Avl | RFQ |
AN804 / MS24390 | an fitting | tee, flared tube with bulkhead on run | Avl | RFQ |
MS21900 / AS21900 | ms fitting | adapter, flareless tube to a flared tube | Avl | RFQ |
MS21915 / AS21915 | ms fitting | adapter, straight, tube to boss | Avl | RFQ |
NAS555 | nas fitting | cross, universal, tube flared ends | Avl | RFQ |
AN910 | an fitting | coupling, pipe thread | Avl | RFQ |
MS21904 / AS21904 | ms fitting | elbow, flareless tube, 90º | Avl | RFQ |
MS21906 / AS21906 | ms fitting | cross, flareless tube | Avl | RFQ |
MS20762-16D | ms fitting | elbow, flared tube, flanged, swivel, 90º | Avl | RFQ |
MS21911 / AS21911 | ms fitting | tee, bulkhead, flareless tube, internal thread on run | Avl | RFQ |
AN917 | an fitting | tee, internal pipe thread | Avl | RFQ |
AN6289 | an fitting | nut, flared tube, universal fitting | Avl | RFQ |
AN784 / MS24389 | an fitting | tee, flared tube, internal thread on run | Avl | RFQ |
AN821 / MS24401 | an fitting | elbow, flared tube, 90º | Avl | RFQ |
MS21923 / AS21923 | ms fitting | adapter, flareless tube, bulkhead and universal to flared tube | Avl | RFQ |
AN785 | an fitting | coupling, union, brazing | Avl | RFQ |
NAS551 | nas fitting | bolt-universal fitting | Avl | RFQ |
AN775 | an fitting | bolt, universal fitting | Avl | RFQ |
MS21925 / AS21925 | ms fitting | elbow, 90º universal, flareless tube, high profile (asg) | Avl | RFQ |
MS20759-24D | ms fitting | elbow, hose, flanged swivel, 90° | Avl | RFQ |
NAS1762 | nas fitting | elbow, reducer, 90º, flareless tube to swivel | Avl | RFQ |
AN929 | an fitting | cap assembly, pressure seal flared tube fitting | Avl | RFQ |
NAS553 | nas fitting | elbow, universal, 90º | Avl | RFQ |
MS21909 / AS21909 | ms fitting | tee, bulkhead and universal, flareless tube | Avl | RFQ |
AN825 / MS20825 | an fitting | tee, flared tube with pipe thread on side | Avl | RFQ |
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