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