NC40 Rotary Shoulder Thread Working Ring and Plug Gauge API Spec 7 2 Oilfield Drilling Connection Gauge Professional Manufacturer
NC40 Rotary Shoulder Thread Working Ring and Plug Gauge API Spec 7 2 Oilfield Drilling Connection Gauge Professional Manufacturer
Description:
API Spec 7-2 NC40 Numbered Connection thread gauges are professional rotary shouldered connection measuring tools strictly manufactured in compliance with API Spec 7 2 standard.
Numbered Connection Gauges is used for thread dimension inspection and tolerance verification of drill pipe, drill collar and other oilfield drilling components.
Widely used in petroleum machinery, OTCG&drill tool manufacturing plants, oilfield service enterprises, and third party testing laboratories.
Numbered Connections Rotary Shoulder Thread Working/Master Ring and Plug Gauges are made of GCr15 tool steel with hardness reaching 60 63HRC, delivering high wear resistance, stable dimensional accuracy and long service life. Every gauge is fully inspected and supplied with official calibration certificate before shipment.
Available variants: Working gauge or Master gauge; Ring gauge, Plug gauge or complete Ring & Plug gauge set.
Some corresponding thread sizes are interchangeable with legacy IF drill string connections.
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:
Number Style Gauge
| Size | Form of Thread Inspected | Pitch per 25.4mm | Taper | Form of Angle | Basic Pitch Dia |
| NC10 | V-0.055 | 4.233(6) | 1:8 | 60° | 27.000 |
| NC12 | V-0.055 | 4.233(6) | 1:8 | 32.131 | |
| NC13 | V-0.055 | 4.233(6) | 1:8 | 35.331 | |
| NC16 | V-0.055 | 4.233(6) | 1:8 | 40.869 | |
| NC23 | V-0.038R | 6.350(4) | 1:6 | 59.817 | |
| NC26(2 3/8 I F) | V-0.038R(V-0.065) | 6.350(4) | 1:6 | 67.767 | |
| NC31(2 7/8 I F) | V-0.038R(V-0.065) | 6.350(4) | 1:6 | 80.848 | |
| NC35 | V-0.038R | 6.350(4) | 1:6 | 89.687 | |
| NC38(3 1/2 I F) | V-0.038R(V-0.065) | 6.350(4) | 1:6 | 96.723 | |
| NC40(4 FH) | V-0.038R(V-0.065) | 6.350(4) | 1:6 | 103.429 | |
| NC44 | V-0.038R | 6.350(4) | 1:6 | 112.192 | |
| NC46(4 I F) | V-0.038R(V-0.065) | 6.350(4) | 1:6 | 117.500 | |
| NC50(4 1/2 I F) | V-0.038R(V-0.065) | 6.350(4) | 1:6 | 128.059 | |
| NC56 | V-0.038R | 6.350(4) | 1:4 | 142.646 | |
| NC61 | V-0.038R | 6.350(4) | 1:4 | 156.921 | |
| NC70 | V-0.038R | 6.350(4) | 1:4 | 179.146 | |
| NC77 | V-0.038R | 6.350(4) | 1:4 | 196.621 |
Packing & Shipping:
Company profile:
Applications:
NC40 numbered connection working gauge 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:
Q1: What standard applies to your NC numbered connection thread gauges?
A: Manufactured strictly to API Spec 7-2 for rotary shouldered connection inspection.
Q2: What’s the difference between Master Gauge and Working Gauge?
A: Master gauge is the reference standard used to calibrate working gauges. Working gauge is for daily thread inspection of drill pipes and drill collars.
Q3: What material and hardness are the NC thread gauges?
A: Made of GCr15 tool steel with hardness 60–63HRC, offering high wear resistance and stable precision.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.