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  2. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    National Pipe Taper Fuel (NPTF, also called Dryseal American National Standard Taper Pipe Thread, defined by ASME B1.20.3) is designed to provide a more leak-free seal without the use of PTFE tape (often referred to by the popular brand name "Teflon") or another sealant compound. NPTF threads have the same basic shape but with crest and root ...

  3. AN thread - Wikipedia

    en.wikipedia.org/wiki/AN_thread

    AN fittings are a flare fitting, using 37° flared tubing to form a metal-to-metal seal. They are similar to other 37° flared fittings, such as JIC , which is their industrial variant. [ 2 ] The two are interchangeable in theory, though this is typically not recommended due to the exacting specifications and demands of the aerospace industry.

  4. Threaded pipe - Wikipedia

    en.wikipedia.org/wiki/Threaded_pipe

    The seal provided by a threaded pipe joint depends upon multiple factors: the labyrinth seal created by the threads; a positive seal between the threads created by thread deformation when they are tightened to the proper torque; and sometimes on the presence of a sealing coating, such as thread seal tape or a liquid or paste pipe sealant such ...

  5. Gasket - Wikipedia

    en.wikipedia.org/wiki/Gasket

    A gasket is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression. It is a deformable material that is used to create a static seal and maintain that seal under various operating conditions in a mechanical assembly. [1]

  6. Armorial of sovereign states - Wikipedia

    en.wikipedia.org/wiki/Armorial_of_sovereign_states

    This armorial of sovereign states shows the coat of arms, national emblem, or seal for every sovereign state. Although some countries do not have an official national emblem, unofficial emblems which are de facto used as national emblems are also shown below.

  7. Bonded seal - Wikipedia

    en.wikipedia.org/wiki/Bonded_seal

    A bonded seal commonly seals between bolt head and body. In mechanical engineering, a bonded seal is a type of washer used to provide a seal around a screw or bolt. Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers. [1] Now widely manufactured, they are available in a range of standard sizes and materials [2 ...

  8. Radial shaft seal - Wikipedia

    en.wikipedia.org/wiki/Radial_shaft_seal

    Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals.

  9. Kovar - Wikipedia

    en.wikipedia.org/wiki/Kovar

    A grey, grey-blue or grey-brown color indicates a good seal. A metallic color indicates lack of oxide, while black color indicates overly oxidized metal, in both cases leading to a weak joint.[2] [citation needed] The name Kovar is often used as a general term for Fe–Ni alloys with these particular thermal expansion properties.

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