====== N ======
===== Needle roller bearing =====
===== NLGI =====
National Lubrication Grease Institute- The objectives of NLGI are to disseminate information that can lead to the development of better lubricating greases for the consumer and to provide better grease lubrication engineering service to the industry. ((https://www.nlgi.org/about-us/))
===== Nm =====
Abbreviation for Newton Meters
===== NOx =====
Oxides of Nitrogen. A common pollutant emitted by gas engines at high temperature  ((Haynes Sportster manual 1970-2010 pg REF*50))
===== NPSC =====
Abbreviation for: National Pipe Straight Coupling (a U.S. standard in piping)
===== NPT =====
Abbreviation for National Pipe Tapered thread (a U.S. standard in piping): In contrast to straight threads that are found on a bolt, a taper thread will pull tight and therefore make a fluid-tight seal. This means that NPT fittings should be burr-free and lubricated using a lubricating material like lubricating paste or tape.  ((https://en.wikipedia.org/wiki/National_pipe_thread))

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