API Screw Thread Gages

NU Screw Threads for American Petroleum Institute-API

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NON-Upset Tubing (NU, NUE)  API SPEC 5B
Working Ring or Working Plug
Size  (in Inches)	T.P.I. (Threads per Inch)	T.P.F. (Taper per Foot)
1.0500	10	3/4
1.3150	10	3/4
1.6600	10	3/4
1.9000	10	3/4
2-3/8	10	3/4
2-7/8	10	3/4
3-1/2	10	3/4
4	8	3/4
4-1/2	8	3/4

 

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Original Posting: 08/24/2011
Last Revision: 6/11/2012
Error corrections in or comments about the above data can be sent to: office@gagecrib.com