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2. O-ring - Wikipedia

   en.wikipedia.org/wiki/O-ring

   O-rings are available in various metric and inch standard sizes. Sizes are specified by the inside diameter and the cross section diameter (thickness). In the US the most common standard inch sizes are per SAE AS568C specification (e.g. AS568-214). ISO 3601-1:2012 contains the most commonly used standard sizes, both inch and metric, worldwide.

3. Vacuum flange - Wikipedia

   en.wikipedia.org/wiki/Vacuum_flange

   Standard sizes are indicated by the nominal inner diameter in millimeters for flanges 10 through 50 mm in diameter. [2] Sizes 10, 20 and 32 are less common sizes (see Renard numbers ). Some sizes share their flange dimensions with their respective larger neighbor and use the same clamp size.

4. Waveguide flange - Wikipedia

   en.wikipedia.org/wiki/Waveguide_flange

   The recessed region is bounded by a deep choke trench (or ditch or groove) cut into the face of the flange. Choke flanges are only used with rectangular waveguide, and are invariably pressurizable, having a gasket groove encircling [3] the choke ditch. The presence of these two concentric circular grooves makes choke flanges easily recognizable.

5. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   ISO general purpose metric screw threads – Part 8: Nominal sizes for 3 mm fine pitch threads; nominal diameter from 28 mm to 300 mm: Active: DIN 13-9: ISO general purpose metric screw threads – Part 9: Nominal sizes for 4 mm fine pitch threads; nominal diameter from 40 mm to 300 mm: Active: DIN 13-10

6. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Metric Screw Threads - MJ Profile: V Thread Form BS 84: Tables of BS Whitworth, BS Fine and BS Pipe Threads: V Thread Form (55°) 1 ⁄ 4 ″-20 BSW ISO 68-1:1998: ISO general purpose screw threads—Basic profile—Part 1: Metric screw threads: V Thread Form ISO 68-2:1998: ISO general-purpose screw threads—Basic profile—Part 2: Inch screw ...

7. Groove (engineering) - Wikipedia

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

   This canal may receive a circlip, an o-ring, or a gasket. A depression on the entire circumference of a cast or machined wheel, a pulley or sheave. This depression may receive a cable, a rope or a belt. A longitudinal channel formed in a hot rolled rail profile such as a grooved rail. This groove is for the flange on a train wheel.