In the making, the size of nominal or trading size is the size "only in name" used for identification. The nominal size may not fit any dimension of the product, but within the product domain, the nominal size may correspond to a large number of highly standard dimensions and tolerances.
For example, dimensional wood dimensions like "2 by 4" refer to boards whose dimensions are closer to 1 2 / 2 Ã, inches by 3 1 / 2 Ã, inch ( 1 3 / 4 Ã, inch by 3 3 / 4 Ã, inch is typical in the United Kingdom). A " 3 1 / 2 -inch" the standard dimension of the floppy disk is 90 mm, or 3.54 inches , and is advertised to store "1.44 megabytes" even though its capacity is 1,474,560 bytes. Pipes " 3 / 4 -inch" in the Nominal Pipe Size system have no exact dimensions of 0.75 inches. The screw thread has a number of dimensions required to ensure proper functioning but is called by the nominal and family size of the circuit design, eg " 1 / 4 inch, 20 threads per inch, Unified National Coarse. "
In the United Kingdom, pipes are available which are quoted in metric size and imperial size. Metric size is larger than the size of the empire. For example, copper pipe 1 / 2 inch and 15 millimeters (0.59 in) is actually the same pipe that has a nominal internal 1 inch in diameter and an external external diameter of 15 millimeters (internal diameter in the measurement system imperial and always external in metric).
Nominal size can be standardized well in an industry, or may be owned by a single manufacturer.
Applying nominal sizes across domains requires an understanding of system sizes in both areas; for example, someone who wants to select the drill bit to clean the screws " 1 / 4 -inch" can see the table to show the proper bit size exercise. A person who wishes to calculate the load capacity of a steel beam should consult the table to translate the nominal size of the beam to a usable dimension.
When considering engineering tolerances between shafts (or bolts) through holes in some other parts (such as nuts), either the shaft (or bolt) has the same nominal size (also called base size) b>), but all holes are physically larger and all shafts are physically smaller so that each shaft (or bolt) of nominal size given can enter into holes of the same nominal size. Video Nominal size
See also
- Paper size
- Trading Galon
- US standard dress size
- Caliber
- Selected number
- Real versus nominal value
- Nominal impedance
Maps Nominal size
References
Source of the article : Wikipedia
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