Lead Gage Setting Standards
Thread Lead is one of the most important thread elements to monitor. Not only is lead inspection an industry wide practice for rotary shouldered connections, it is an API Specification 7 mandated requirement. Lead error is most commonly generated by manual and CNC lathes not cutting properly.
Thread lead is the distance between threads, measured on a plane parallel to the centerline of the threaded part. Lead error has a direct effect on functional diameter, stand-off, and thread flank engagement.
| P/N. | Model | Connection Type/Description | TPF | TPI |
| LDS-1004 | LJK-1004 | 6⅝” API Reg; 4”, 5½”, & 6⅝” API Full Hole; 2⅞”, 3½” – 5” Hughes Xtra Hole; | 2″ | 4 |
| 2⅜”, 2⅞” – 4½” Hughes Slim Hole; 2⅜” – 5½” API INT Flush; API Numbered Connections #23-#50 | ||||
| LDS-1005 | LJK-1005 | 5½”, 7⅝” – 8⅝” API Reg, API Numbered Connections #56 – #77 | 3″ | 4 |
| LDS-1006 | LJK-1006 | 2⅜” – 4½” API Reg, 3½”, 4½” API Full Hole | 3″ | 5 |
| LDS-1007 | LJK-1007 | API Numbered Connections #10, #12, #13, #16 | 1.5″ | 4 |
| A.M.T. (Macaroni Tubing) | ||||
| 2⅜” – 3½” PAC ;2⅜” – 4” American Open Hole | ||||
| LDS-1008 | LJK-1008 | 3½” – 6⅝” Hughes H-90 | 2″ | 3.5 |
| LDS-1009 | LJK-1009 | 7”- 8⅝” Hughes H-90 | 3″ | 3.5 |
| LDS-1010 | LJK-1010 | 2⅜” – 3 ½” Slim Line H-90 | 1.25″ | 3 |
Gage Depot lead gages inspect pin and box connections for multiple pitches and thread forms. The gages provide dimensional verification of product print data on the thread’s true integrity.
Interchangeable contact points allow inspection on a variety of thread forms. Inspect RSC threads as well as Tubing and Casing threads, Requires presetting using lead gage setting standards, standards are not included.
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