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2. Grease fitting - Wikipedia

   en.wikipedia.org/wiki/Grease_fitting

   The grease gun hose is usually at a sharp angle (e.g. 70-90°) to the axis of the nipple but can be approached from any azimuthal angle. It is not possible for grease pressure to force this type of connector away from the nipple. Grease fittings are commonly made from zinc-plated steel, stainless steel, or brass.

3. Universal joint - Wikipedia

   en.wikipedia.org/wiki/Universal_joint

   the bend angle of the joint, or angle of the axles with respect to each other, with zero being parallel or straight through. These variables are illustrated in the diagram on the right. Also shown are a set of fixed coordinate axes with unit vectors x ^ {\displaystyle {\hat {\mathbf {x} }}} and y ^ {\displaystyle {\hat {\mathbf {y} }}} and the ...

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   This fitting (also known as a "bungalow fitting" or a "cottage fitting") is a sanitary tee that allows two trap arms to be connected at the same level. A toilet is the main connection, with the option of a right or left-hand outlet to the 3" inlet with a choice of 1-1/2" or 2" in size.

5. Constant-velocity joint - Wikipedia

   en.wikipedia.org/wiki/Constant-velocity_joint

   A Rzeppa-type CV joint. A constant-velocity joint (also called a CV joint and homokinetic joint) is a mechanical coupling which allows the shafts to rotate freely (without an appreciable increase in friction or backlash) and compensates for the angle between the two shafts, within a certain range, to maintain the same velocity.

6. Railway coupling by country - Wikipedia

   en.wikipedia.org/wiki/Railway_coupling_by_country

   Norwegian coupler, also known as chopper or Jones coupler; pin and cup coupler (WABCO N-Type) SA-3, also known as SovietAuto-3, AK69e, CA-3, Russian or Willison coupler; Scharfenberg coupler, also known as Dellner, Schaku or Voith coupler While different Scharfenburg couplers may be mechanically compatible, they may be electrically incompatible.

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