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Thank you for the link. I appreciate you taking the time.

I think in this case, it's definitely an abbreviation of the material though.

It's in the "Material Specification" column of the Schedule of Spare Parts.

Some of the other abbreviations are fairly obvious:

M.S. - Mild Steel

St.Stl. - Stainless

Nim - Nimonic

One of the parts listed as N.S has no threading also.

I had assumed it to be Nimonic until I saw that it had it's own abbreviation.