ASME B1.20.2M : 2006 : R2011

Foreword
Committee Roster
Correspondence With the B1 Committee
1 Scope
2 Reference and Symbols
3 Taper Pipe Thread Form
4 Specifications for General Purpose Taper Pipe Threads, NPT
5 Specifications for Internal Parallel Threads in Pipe
  Couplings, NPSC
6 Gauges and Gauge Tolerances for Standard Pipe Thread, NPT
7 Gauging of Taper Pipe Thread, NPT
8 Gauging of NPSC Parallel Pipe Threads
Nonmandatory Appendices
A - The Turns of Engagement Method of Verifying Product Threads
B - Tap Drill Sizes

Describes the designations, dimensions, and tolerances and establishes a verification system for 60 degrees included angle pipe threads.