National Pipe Thread is a U.S. standard for tapered (NPT) or straight (NPS) threads used to join pipes and fittings. ANSI/ASME standard B1.20.1 covers threads of 60-degree form with flat crests and roots in sizes from Â¹âââ inch to 24 inch Nominal Pipe Size.
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iv Sustainment of Army Forces in Operation Iraqi Freedom: Major Findings and Recommendations. For more information on RAND Arroyo Center, contact the Director of Op-. erations (telephone 310-393-0411, extension 6419; FAX 310-451-6952; email. Marcy_Agmon@rand.org), or visit Arroyoâs web site at http://www.rand.org/ard/.