4 1/2 Full Hole Rotary Shouldered Connection Thread Gauges for Inspection Internal & External Threads of Drill Pipe, Drill Collar

4 1/2 Full Hole Rotary Shouldered Connection Thread Gauges for Inspection Internal & External Threads of Drill Pipe, Drill Collar

Description:

API Full Hole (FH) Thread Gauges are precision measuring tools manufactured in compliance with API Spec 7-2, designed for accurate inspection of Full Bore Drill String FH threaded connections in oil & gas drilling operations. Made from premium GCr15 bearing steel, these FH thread gauges are heat-treated to achieve a hardness of 60–63 HRC, delivering excellent wear resistance, dimensional stability and long service life. Every gauge is supplied with an official calibration certificate to guarantee traceable measurement accuracy for quality control.

API FH thread gauges are widely used for thread dimension verification of drill pipe, drill collar and other full bore drill string connections. They help inspect thread form, pitch, taper and pitch diameter, ensuring threaded assemblies meet API requirements, prevent connection failure and secure reliable performance during downhole drilling.

API FH thread gauges covers standard sizes: 2 7/8FH,3-1/2 FH ,4-1/2 FH, 5-1/2 FH, and 6-5/8 FH, vailable variants: Working gauge or Master gauge; Ring gauge, Plug gauge or complete Ring & Plug gauge set.

Quick Detail:

1. Standard: API Spec 7-2
2. Material: GCr15
3. Hardness: 60-63HRC
4. Come with calibration certificate.

When you order, please specify the following information:
1. Type and Sizes of connections
2. Master gauge or working gauge
3. Ring or plug or set

Specification:

FH and IF Full-Hole Style

Packaging & Shipping:

Company Profile:

Applications:

Full hole working gauges are mainly used in the petroleum oil and gas industry.

Precautions:

1. It is not allowed to touch the working surface of the gauge with your hands, so as not to cause rust.

2. Inspect regularly to see if there is any damage, rust or deformation. If you find that the gauge begins to rust,

    you should put it in gasoline and soak it for a period of time, then take it out and wipe it carefully, and apply anti-rust oil.

3. Do not save the working surfaces of the two gauges together, otherwise the two working surfaces

    will be glued to each other, and the gauge will be unnecessarily damaged when separated by external force.

4. After used the threaded gauges, it should be wiped clean and stored under dry condition.

FAQ:

1. Q: What are API FH Thread Gauges?
A: API FH (Full Hole) Thread Gauges are precision tools per API Spec 7-2 for inspecting full bore drill string threads of drill pipe and drill collar in oil & gas drilling.
2. Q: Material & hardness of FH thread gauges?
A: GCr15 bearing steel, heat-treated to 60–63 HRC for high wear resistance.
3. Q: Do you supply calibration certificate?
A: Yes, each gauge comes with official calibration certificate for traceable accuracy.
4. Q: What parameters can FH thread gauges measure?
A: Check thread form, pitch, taper and pitch diameter to avoid drill string connection failure.