Part 2 : Individual pieces used in the assembly of single equipment units (e.g., body, bonnet, gate, stud, handwheel, etc., are parts of a valve). Also may be a piece in raw material form. (Spec 6A)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}