Lead Gages For Thread Lead Inspection
Rotary Shouldered Connection Thread Inspection
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.
FYOU PMEC 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.
| P/N | Model | Measuring Range | Resolution | Description |
| EXL72-RSC | WRW2 | 0.5～4in Thread Length | 0.002mm | External Lead Gage2-point, RSC |
| INL72-RSC | WRN2 | 0.5～4in Thread Length | 0.002mm | Internal Lead Gage 2-point, RSC |
Lead Gage Setting Standards
FYOU PMEC precision lead gage setting standards are manufactured in accordance with API Specification 7-2. Lead gage. standards are used to set the gage prior to the inspection.
| 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 |
| LDS-1004 | LJK-1004 | 6⅝” API Reg; 4”, 5½”, & 6⅝” API Full Hole; 2⅞”, 3½” – 5” Hughes Xtra Hole; 2⅜”, 2⅞” – 4½” Hughes Slim Hole; 2⅜” – 5½” API INT Flush; API Numbered Connections #23-#50 |
2″ | 4 |
| 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 A.M.T. (Macaroni Tubing) 2⅜” – 3½” PAC ;2⅜” – 4” American Open Hole |
1.5″ | 4 |
| 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 |
API Contact Points for Lead Gages
FYOU PMEC’s standard ball contact points are manufactured with carbide balls. Lead gages require two contact points. Contact points are sold individually.
| Model | Point Diameter | Threads Per Inch | Connection Type |
| CP235 | 0.235” | 3 | Hughes Slim Line H-90 |
| CP200 | 0.200” | 3½ | All Hughes H-90 |
| CP144 | 0.144” | 4 | API Rotary Shouldered Connections |
| CP128 | 0.128” | 4½ | API Rotary Shouldered Connections |
| CP115 | 0.115” | 5 | API Rotary Shouldered Connections |
| CP096 | 0.096” | 6 | API Rotary Shouldered Connections |
For more information click the links below:
Hughes H90 Non Preferred Rotary Shouldered Connection Thread Plug and Ring Gages
Hughes H90 Rotary Shouldered Connection Thread Gages
Hughes H90 Non Preferred Rotary Shouldered Connection
IF – Internal Flush – Rotary Shouldered Connection Thread Plug and Ring Gages