Thread addendum is now a mandated inspection according to the API 5B Specification 16th Ed. Gage Depot also supply several models of thread addendum gages. Please specify the type of thread when ordering. Addendum gages require setting with a particular standard. Standard sold separately.
| P/N | Model | Connection Type/Description | TPF | TPI |
| THR-1001 | CGK | API 8-Round Casing, Tubing & Drill Pipe, All 10-Round Tubing, Thread Height | 3/4″ | 8 & 10 |
| THB-1002 | CGK | API Buttress Casing, Internal/External, 4½” – 13⅜” ,Thread Height | 3/4″ | 5 |
| THB-1003 | CGK | API Buttress Casing, Internal/External, 16” – Larger ,Thread Height | 1” | 5 |
| ADD-1004 | CDGK | API 8-Round Casing, Tubing & Drill Pipe, All 10-Round Tubing, Thread Addendum | 3/4″ | 8 & 10 |
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