The lead gage inspects both internal and external thread leads using contact points that seat in the threads of a part. The pitch of the thread determines the diameter of the contact points required for taking measurements.
| P/N | Model | Measuring Range | Resolution | Description |
| EXL5B | WRW | 0.5～4in Thread Length | 0.02mm | External Lead Gage2-point, Tubing&Casing |
| INL5B | WRN | 0.5～4in Thread Length | 0.02mm | Internal Lead Gage 2-point, Tubing&Casing |
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.
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