Thread Lead Inspection-Lead Gages
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-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 |
Thread Taper Inspection-Taper Gages
Thread Taper is the change in pitch diameter over the length of a connection, typically designated in metric. For all rotary shouldered connections, measuring thread taper is not only an industry wide practice; it is an API mandated inspection.
During the manufacturing process, taper must be accurately measured and quantified to avoid mismatched tapers. When under a service load, mismatched tapers between pins and boxes diminish proper thread engagement resulting in reduced connection performance.
| P/N | Model | Measuring Range | Travel | Resolution |
| ETG1129-RSC | JZW5 | 1-1/2″~9″, External Taper,RSC | 0～1 in | 0.0005in |
| ITG1129-RSC | JZN06Z | 1-1/2″~9″, Internal Taper,RSC | 0～1in | 0.0005in |
API Contact Points for Taper Gages
FYOU PMEC’s standard ball contact points are manufactured with carbide balls. Taper 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” | 3.5 | All Hughes H-90 |
| CP144 | 0.144” | 4 | API Rotary Shouldered Connections |
| CP115 | 0.115” | 5 | API Rotary Shouldered Connections |
| CP096 | 0.096” | 6 | API Rotary Shouldered Connections |
Thread Height Inspection -Thread Height Gauges
Thread Height Inspection -Thread Height Gauges
Proper thread height maximizes the performance of any threaded connection and is a required inspection by the API. Thread height not only affects the interchangeability but also the integrity of a thread assembly. Thread height is the distance between the crest and the root, normal to the axis of the thread and several issues can be easily detected by simply inspecting thread height.
From detecting a chipped tool to preventing a connection from pulling apart under critical loads, inspecting thread height is valuable. Thread Height Gages inspect both internal and external thread height for a variety of thread forms and provide immediate feedback on the integrity of your threads.
| P/N | Model | Description | Connection | Range | Resolution |
| ETH038-RSC | WGW4 | External Thread Height | V-038R | 0～4mm | 0.01mm |
| ETH040-RSC | WGW5 | External Thread Height | V-040 | 0～4mm | 0.01mm |
| ETH050-RSC | WGW6 | External Thread Height | V-050 | 0～4mm | 0.01mm |
| ITH038-RSC | WGN-038R | Internal Thread Height | V-038R | 0～4mm | 0.01mm |
| ITH040-RSC | WGN-040 | Internal Thread Height | V-040 | 0～4mm | 0.01mm |
| ITH050-RSC | WGN-050 | Internal Thread Height | V-050 | 0～4mm | 0.01mm |
Thread Height Gage Standards
FYOU PMEC supply precision setting standards for thread height gages to API specifications. Please specify the type of thread when ordering.
| P/N | Model | Connection Type/Description | TPF | TPI |
| THS-10322 | CGK-10322 | V-0.032 | 2 TPF | 6 TPI |
| THS-10382 | CGK-10382 | V-0.038R | 2 TPF | 4 TPI |
| THS-10383 | CGK-10383 | V-0.038R | 3 TPF | 4 TPI |
| THS-10403 | CGK-10403 | V-0.040 | 3 TPF | 5 TPI |
| THS-10502 | CGK-10502 | V-0.050 | 2 TPF | 4 TPI |
| THS-10503 | CGK-10503 | V-0.050 | 3 TPF | 4 TPI |
| THS-10551.5 | CGK-10551.5 | V-0.055 | 1.5 TPF | 6 TPI |
| THS-10761.5 | CGK-10761.5 | V-0.076 | 1.5 TPF | 4 TPI |
| THS-10H90-2 | CGK-10H90-2 | H-90 Connection (90-V-0.050) | 2” TPF | 3.5 TPI |
| THS-10H90-3 | CGK-10H90-3 | H-90 Connection (90-V-0.050) | 3” TPF | 3.5 TPI |
| THS-SL-H90 | CGK-SL-H90 | 90-V-0.084 | 1¼” TPF | 3 TPI |
Saddle Gage for Pipe Straightness
The Saddle Gage measures the amount of hook or bend at the end of a joint of pipe，Measure the coaxial variation of the connecting drill stems.
| P/N | Model | Description | Range | Resolution | Connection |
| SDG-0858-RSC | XX | Saddle Gage, Drill Coaxality Measuring Stand | 0～10 mm | 0.01 mm | All Sizes |