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 | Description | Connection | Range | Resolution |
| EAD10R | WDGN1 | External Addendum | 10-Round | 0～3.5mm | 0.01mm |
| EAD08R | WDGN2 | External Addendum | 8-Round | 0～3.5mm | 0.01mm |
| IAD10R | WDGW1 | Internal Addendum | 10-Round | 0～3.5mm | 0.01mm |
| IAD08R | WDGW2 | Internal Addendum | 8-Round | 0～3.5mm | 0.01mm |
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