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In conversations with customers, we sometimes express that we want a tap of the sambu.
Sambu is one of the so-called industry terms, and the size of the screw expressed in inches may be expressed as "○○ bu".
1/8 = Ichibu (1 minute)
1/4 = 2/8 = nib (2 minutes)
3/8 = Sambu (3 minutes)
1/2 = 4/8 = Yongbu Shibu (4 minutes)
It is called by adding "bu" to the numerator when the denominator is divided by 8.
In addition, "厘" is used as a way to express the detailed size.
1 minute = 10 cents.
In the way of expressing a larger size or a smaller size ,
1-3/4 = inchlob (1 inch + 6/8 so )
1/16 = Golin (because half of 1/1 is 5% )
5/16 = Nibgolin 5/16 = 2/8 + 1/16 ( 2 minutes + 0.5 minutes (=5 cents) )
Screws that represent size in inches include PF and PS in addition to PT for pipe threads, as well as Rc, G, and Rp of the new JIS standard.
There is also the possibility of NPT for US pipe screws.
Unified screws and whitworth screw are also inch size , so some people also describe them as "○○ bu".
In other words, if you say "Sambu", you need to check the type of screw because of all the possibilities.
By the way, 1 inch = 25.4mm.
Even in pipe screws, there are cases where the size is expressed in inches as "○○ bu".
The screws and tools for the actual pipe are separately standardized sizes.
In conclusion, when identifying threads, you can avoid unnecessary troubles by carefully checking the "thread type", " size ", and "pitch".