Oil country tubular goods (OCTG’S), wellheads, and other associated equipment used in the drilling and development of production of hydrocarbons in critcal and/or hostile environments require not only expert design but also a detailed quality assurance and quality control (QNQC) product spedfication program from procurement of the equipment to final installation at location. This paper wil address the development of a QNQC product specification for the specifying and procurement of OCTG’s and wellheads used in critical applications.