API SPEC 5B-1996 Specification for Threading@ Gauging@ and Thread Inspection of Casing@ Tubing@ and Line Pipe Threads (U.S. Customary Units) (FOURTEENTH EDITION)
This specification covers dimensions and marking requirements
for API Master thread gauges. Additional product
threads and thread gauges as well as instruments and methods
for the inspection of threads for line pipe, round thread
casing, buttress casing, and extreme line casing connections
are included. It is applicable when so stipulated in the API
standard governing the product. The inspection procedures
for measurements of taper, lead, height, and angle of thread
are applicable to threads having 1 11/2 or less turns per inchAll thread dimensions shown without tolerances are
related to the basis for connection design and are not subject
to measurement to determine acceptance or rejection of
product.