Aircraft Hydraulic Fittings Catalog by AN, MS and NAS

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 standardsUse our optimized search engine to find the exact part you need.

Part No Category Type Description QTY RFQ
NAS555 nas fitting cross, universal, tube flared ends Avl RFQ
NAS554 nas fitting elbow, universal, 45º Avl RFQ
NAS553 nas fitting elbow, universal, 90º Avl RFQ
NAS552 nas fitting elbow, universal, 90º Avl RFQ
NAS551 nas fitting bolt-universal fitting Avl RFQ
NAS424 nas fitting coupling - tube flared fitting, female thread Avl RFQ
NAS1764 nas fitting tee, reducer, swivel, flareless tube on runs Avl RFQ
NAS1763 nas fitting tee, reducer, flareless tube to swivel on run Avl RFQ
NAS1762 nas fitting elbow, reducer, 90º, flareless tube to swivel Avl RFQ
NAS1761 nas fitting elbow, reducer, 45º, flareless tube to swivel Avl RFQ
MS21926 / AS21926 ms fitting elbow, 90º. universal, flareless tube, low profile Avl RFQ
MS21925 / AS21925 ms fitting elbow, 90º universal, flareless tube, high profile (asg) Avl RFQ
MS21924 / AS21924 ms fitting union, flareless tube, bulkhead and universal Avl RFQ
MS21923 / AS21923 ms fitting adapter, flareless tube, bulkhead and universal to flared tube Avl RFQ
MS21922 / AS21922 ms fitting sleeve, coupling, flareless Avl RFQ
MS21921 / AS21921 ms fitting nut, sleeve coupling, flareless Avl RFQ
MS21916 / AS21916 ms fitting reducer, external thread, flareless tube Avl RFQ
MS21915 / AS21915 ms fitting adapter, straight, tube to boss Avl RFQ
MS21914 / AS21914 ms fitting cap, pressure seal, flareless tube fitting Avl RFQ
MS21913 / AS21913 ms fitting plug, flareless tube Avl RFQ
MS21912 / AS21912 ms fitting tee, flareless tube with bulkhead on run Avl RFQ
MS21911 / AS21911 ms fitting tee, bulkhead, flareless tube, internal thread on run Avl RFQ
MS21910 / AS21910 ms fitting tee, bulkhead, flareless tube, internal thread on side Avl RFQ
MS21909 / AS21909 ms fitting tee, bulkhead and universal, flareless tube Avl RFQ
MS21908 / AS21908 ms fitting elbow, bulkhead universal 90º, flareless tube Avl RFQ
MS21907 / AS219097 ms fitting elbow, bulkhead universal, 45º, flareless tube Avl RFQ
MS21906 / AS21906 ms fitting cross, flareless tube Avl RFQ
MS21905 / AS21905 ms fitting tee, flareless tube Avl RFQ
MS21904 / AS21904 ms fitting elbow, flareless tube, 90º Avl RFQ
MS21903 / AS21924 ms fitting union, flareless tube, 3/8 bulkhead and universal Avl RFQ
MS21902 / AS21902 ms fitting union, flareless tube Avl RFQ
MS21900 / AS21900 ms fitting adapter, flareless tube to a flared tube Avl RFQ
MS20913 / AS4863 ms fitting plug, pipe Avl RFQ
MS20819 / AS5176 OR ms fitting sleeve, flared tube fitting Avl RFQ
MS20762-16D ms fitting elbow, flared tube, flanged, swivel, 90º Avl RFQ
MS20761-12D ms fitting elbow, flared tube, flanged, swivel, 45º Avl RFQ
MS20760-16K ms fitting adapter, straight, flange to tube Avl RFQ
MS20759-24D ms fitting elbow, hose, flanged swivel, 90° Avl RFQ
MS20757-12D ms fitting connector, fixed flange to hose Avl RFQ
AN941 an fitting elbow, internal screw thread, 45º Avl RFQ
AN939 an fitting elbow, internal screw thread, 90º Avl RFQ
AN938 an fitting tee, internal screw thread Avl RFQ
AN937 an fitting cross, internal screw thread Avl RFQ
AN933 an fitting plug, pipe, hex head 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
AN924 / MS24400 an fitting nut, flared tube, bulkhead and universal fitting Avl RFQ
AN919 / MS24399 an fitting reducer, external thread, flared tube Avl RFQ
AN918 an fitting cross, internal pipe thread Avl RFQ
AN917 an fitting tee, internal pipe thread Avl RFQ
AN916 an fitting elbow, internal pipe thread, 90ºº Avl RFQ
AN915 an fitting elbow, internal and external pipe thread, 45º Avl RFQ
AN914 an fitting elbow, internal and external pipe thread, 90º Avl RFQ
AN912 an fitting reducer, pipe bushing Avl RFQ
AN911 an fitting nipple, pipe thread Avl RFQ
AN910 an fitting coupling, pipe thread Avl RFQ
AN894 / MS24398 an fitting bushing, screw thread, expander Avl RFQ
AN893 / MS24397 an fitting bushing, screw thread, reducing Avl RFQ
AN871 an fitting flange, straight thread, boss welding Avl RFQ
AN849 an fitting connector, hose, bulkhead Avl RFQ
AN844 an fitting elbow, pipe thread and hose, 45º Avl RFQ
AN842 an fitting elbow, pipe thread and hose, 90º Avl RFQ
AN841 an fitting adapter, hose to flared tube Avl RFQ
AN840 an fitting adapter, hose to pipe thread Avl RFQ
AN839 an fitting elbow, hose to universal, 45º Avl RFQ
AN838 an fitting elbow, hose to universal, 90º Avl RFQ
AN837 / MS24396 an fitting elbow, flared tube and universal, 45º Avl RFQ
AN834 / MS24395 an fitting tee, bulkhead universal, flared tube Avl RFQ
AN833 / MS24394 an fitting elbow, flared tube and bulkhead universal, 90º Avl RFQ
AN832 / MS24393 an fitting union, flared tube, bulkhead and universal Avl RFQ
AN827 / MS24403 an fitting cross, flared tube Avl RFQ
AN826 / MS20826 an fitting tee, flared tube with pipe thread on run Avl RFQ
AN825 /  MS20825 an fitting tee, flared tube with pipe thread on side Avl RFQ
AN824 / MS24402 an fitting tee, flared tube Avl RFQ
AN823 / MS20823 an fitting elbow, flared tube and pipe thread, 45º Avl RFQ
AN822 / MS20822 an fitting elbow, flared tube and pipe thread, 90º Avl RFQ
AN821 / MS24401 an fitting elbow, flared tube, 90º Avl RFQ
AN818 an fitting nut, coupling Avl RFQ
AN817 an fitting nut, sleeve coupling Avl RFQ
AN816 an fitting nipple, flared tube and pipe thread Avl RFQ
AN815 / MS24392 an fitting union, flared tube Avl RFQ
AN814L (SHOWN) / MS2 an fitting plug and bleeder, screw thread Avl RFQ
AN807 an fitting adapter, hose to universal Avl RFQ
AN806 / MS24404 an fitting plug, flared tube Avl RFQ
AN805 an fitting nut, union Avl RFQ
AN804 / MS24390 an fitting tee, flared tube with bulkhead on run Avl RFQ
AN800 an fitting union, cone Avl RFQ
AN785 an fitting coupling, union, brazing Avl RFQ
AN784 / MS24389 an fitting tee, flared tube, internal thread on run Avl RFQ
AN783 / MS24388 an fitting tee, flared tube, internal thread on side Avl RFQ
AN780 an fitting nipple, union Avl RFQ
AN779 an fitting tee, universal fitting Avl RFQ
AN778 an fitting elbow, universal, 45º Avl RFQ
AN777 an fitting elbow, universal, 75º Avl RFQ
AN776 an fitting elbow, universal, 90º Avl RFQ
AN775 an fitting bolt, universal fitting Avl RFQ
AN774 an fitting bolt, tube fitting end, universal Avl RFQ
AN6289 an fitting nut, flared tube, universal fitting Avl RFQ
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