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  2. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French scale measures the outer diameter of the catheter, not the size of the internal drainage channel (inner diameter). For instance, a two-way catheter of 20 Fr and a three-way catheter of 20 Fr have the same outer diameter, but the three-way catheter has an additional channel for irrigation, reducing the size of its drainage channel.

  3. Needle roller bearing - Wikipedia

    en.wikipedia.org/wiki/Needle_roller_bearing

    A needle roller bearing. A needle roller bearing is a special type of roller bearing which uses long, thin cylindrical rollers resembling needles. Ordinary roller bearings' rollers are only slightly longer than their diameter, but needle bearings typically have rollers that are at least four times longer than their diameter. [1]

  4. Birmingham gauge - Wikipedia

    en.wikipedia.org/wiki/Birmingham_gauge

    The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm). The increments between gauge sizes are not linear and vary. [2]

  5. Hegman gauge - Wikipedia

    en.wikipedia.org/wiki/Hegman_gauge

    The grooves decrease in depth from one end of the block to the other, according to a scale stamped next to them. A typical Hegman gauge is 170mm by 65mm by 15mm, with a channel of grooves running lengthwise, 12.5mm across and narrowing uniformly in depth from 100 μm to zero and used to determine particle size. [3]

  6. Ball (bearing) - Wikipedia

    en.wikipedia.org/wiki/Ball_(bearing)

    For a given lot there is a lot diameter variation, which is the difference between the mean diameter of the largest ball and the smallest ball of the lot. [4] Sphericity refers to the amount of deviation from a true spherical form (out of roundness). [4] This is measured by rotating a ball against a linear transducer with a gauge force of less ...

  7. 8 bore - Wikipedia

    en.wikipedia.org/wiki/8_bore

    The 8 bore was a popular wildfowling calibre both in muzzleloaders and later cartridge shotguns. 8 bore cartridges were available in multiple lengths including 3-inch, 3¼-inch, 3¾-inch and 4-inch. [ 1 ]

  8. Cam follower - Wikipedia

    en.wikipedia.org/wiki/Cam_follower

    A cam follower, also known as a track follower, [1] is a specialized type of roller or needle bearing designed to follow cam lobe profiles. Cam followers come in a vast array of different configurations, however the most defining characteristic is how the cam follower mounts to its mating part; stud style cam followers use a stud while the yoke style has a hole through the middle.

  9. Gauge (knitting) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(knitting)

    Generally, the gauge should match to better than 5%, corresponding to 1" of ease in a 20" width. Similar concerns apply to the number of rows per inch. The gauge can be adjusted by changing needle size, without changing the pattern, stitch, yarn, or habits of the knitter. Larger needles produce a smaller gauge (fewer stitches per inch) and ...