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For larger mechanical tubing, however, the gauge number indicates the wall thickness, independent of the tube's overall size. In medicine, the Birmingham gauge is widely used to specify the outer diameter of hypodermic needles, catheters, cannulae, and suture wires. However, catheters are more commonly defined using the French catheter gauge ...
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.
The six most common shotgun gauges, in descending order of size, are the 10 gauge, 12 gauge, 16 gauge, 20 gauge, 28 gauge, and .410 bore. [7] By far the most popular is the 12 gauge, [7] particularly in the United States. [8] The 20-gauge shotgun is the next most popular size [citation needed], and is popular for upland game hunting. The next ...
The outside diameter of a gear is the diameter of the addendum (tip) circle. In a bevel gear it is the diameter of the crown circle. In a throated worm gear it is the maximum diameter of the blank. The term applies to external gears, this is can also be known from major diameter. [1]
Butterflies are commonly available in 18-27 gauge bore, [1] 21G and 23G being most popular.. In phlebotomy, there is widespread avoidance of 25G and 27G butterflies based on belief that such small-bore needles hemolyze and/or clot blood samples and hence invalidate blood tests. [2]
Changing yarn weight or needle size can have a significant impact on the finished project, so standardized systems have been spread about, as well as conversion systems for regional standards (especially needle sizes). [1] Yarn weight is important in achieving the correct gauge or tension for a particular project and can help with yarn ...
Most sewing machine needles will have packaging that gives both of these numbers in its size description — (e.g. as either 100/16 or 16/100). The length of all sewing machine needles has been standardized and does not require a separate code. The metric designation is the actual needle diameter in hundredths of a millimeter. [3]
Larger knitting needles also produce larger stitches, giving fewer stitches and rows per inch. Changing needle size is the best way to control one's own gauge for a given pattern and yarn. Finally, the knitter's tension, or how tightly one knits, can affect the gauge significantly.