What does NB stand for?

MLA style: "NB." Acronym Finder . 2013. AcronymFinder.com 26 May. 2013 <a href="http://www.acronymfinder.com/Nominal-Bore-(internal-diameter-of-a-pipe%2ffitting)-(NB).html">http://www.acronymfinder.com/Nominal-Bore-(internal-diameter-of-a-pipe%2ffitting)-(NB).html
Chicago style: Acronym Finder . S.v. "NB." Retrieved May 26 2013 from <a href="http://www.acronymfinder.com/Nominal-Bore-(internal-diameter-of-a-pipe%2ffitting)-(NB).html">http://www.acronymfinder.com/Nominal-Bore-(internal-diameter-of-a-pipe%2ffitting)-(NB).html
APA style: NB. (n.d.) Acronym Finder. (2013). Retrieved May 26 2013 from <a href="http://www.acronymfinder.com/Nominal-Bore-(internal-diameter-of-a-pipe%2ffitting)-(NB).html">http://www.acronymfinder.com/Nominal-Bore-(internal-diameter-of-a-pipe%2ffitting)-(NB).html

Nominal Bore (internal diameter of a pipe/fitting)

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Samples in periodicals archive:

Fitted to the wall of the component, OE Flo-Tel is available for discs with a nominal bore of between 25mm and 100mm.

Nominal bore sizes begin at 25mm, burst pressure goes down to just 5 mbar g, while operating ranges extend to 95% of rated burst pressure.

They all have 250mm nominal bore and are constructed in 316 stainless steel with a machined finish to all contact parts.