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2. Engineering fit - Wikipedia

   en.wikipedia.org/wiki/Engineering_fit

   Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.

3. Tamper-evident band - Wikipedia

   en.wikipedia.org/wiki/Tamper-evident_band

   A tamper-evident band or security ring serves as a tamper resistant or tamper evident function to a screw cap, lid, or closure. [1] The term tamper-proof is sometimes used but is considered a misnomer given that pilfering is still technically possible. [2] A security band can be integrated with the cap or can be a separate package component.

4. Retaining ring - Wikipedia

   en.wikipedia.org/wiki/Retaining_ring

   Klip (also known as a poodle ring) - similar to an E-ring but with larger ears that provide a large surface area against the retained part [9] Self-locking ring - does not require a groove [7] Split ring (also known as an X-washer) - fits into external grooves and is closed with a pair of pliers [9] Low clearance ring (also known as a crescent ...

5. End-face mechanical seal - Wikipedia

   en.wikipedia.org/wiki/End-face_mechanical_seal

   The seal ring and mating ring are sometimes referred to as the primary sealing surfaces. The primary sealing surfaces are the heart of the end-face mechanical seal. A common material combination for the primary sealing surfaces is a hard material, such as silicon carbide , ceramic or tungsten carbide and a softer material, such as carbon .

6. Napkin ring problem - Wikipedia

   en.wikipedia.org/wiki/Napkin_ring_problem

   Reprint of 1935 edition. A problem on page 101 describes the shape formed by a sphere with a cylinder removed as a "napkin ring" and asks for a proof that the volume is the same as that of a sphere with diameter equal to the length of the hole. Pólya, George (1990), Mathematics and Plausible Reasoning, Vol.

7. Backlash (engineering) - Wikipedia

   en.wikipedia.org/wiki/Backlash_(engineering)

   In mechanical engineering, backlash, sometimes called lash, play, or slop, is a clearance or lost motion in a mechanism caused by gaps between the parts. It can be defined as "the maximum distance or angle through which any part of a mechanical system may be moved in one direction without applying appreciable force or motion to the next part in mechanical sequence."