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API Screw Thread Gages

CSG Screw Threads for American Petroleum Institute-API

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Working Ring or Working Plug
Size (in Inches)
T.P.I. (Threads per Inch)
T.P.F. (Taper per Foot)
4-1/2
8
3/4
5
8
3/4
5-1/2
8
3/4
6-5/8
8
3/4
7
8
3/4
7-5/8
8
3/4
8-5/8
8
3/4
9-5/8
8
3/4
10-3/4
8
3/4
11-3/4
8
3/4
13-3/8
8
3/4
16
8
3/4
18-5/8
8
3/4
20
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
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