Gage Depot lead gages use interchangeable contact points to inspect both pin and box threads for a wide variety of API tubing & casing connections. Lead inspection is both an API mandated requirement and an industry wide practice. Defined as the distance between threads as measure on a plane parallel to the centerline of the threaded part, lead variation has a direct effect on standoff, thread flank engagement, and make-up. Lead error is most commonly generated by manual and CNC lathes not cutting properly.
| P/N. | Model | Connection Type/Description | TPF | TPI |
| LDS-1001 | LJK-1001 | API 8-Round Casing, Tubing & Drill Pipe, All 10-Round Tubing | 3/4″ | 8 & 10 |
| LDS-1002 | LJK-1002 | API Buttress Casing, Internal/External, 4½” – 13⅜” | 3/4″ | 5 |
| LDS-1003 | LJK-1003 | API Buttress Casing, Internal/External,16″ – Larger | 1″ | 5 |
Before inspecting parts, the lead gage must be preset to a nominal predetermined dimension using a lead gage setting
standard.
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