Professional Grade API Numbered Connections(NC70) Thread Gauge
Description:
API Spec 7-2 NC70 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:
NC70 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:
1. What is API Spec 7-2 NC thread gauge used for?
It is rotary shouldered connection measuring tool complying with
API Spec 7-2, for thread dimension & tolerance inspection of
drill pipe, drill collar and other drilling components. Widely used
in petroleum machinery, drill tool factories, oilfield service
firms and third-party labs.
2. What material and hardness are the gauges?
Made of GCr15 tool steel, hardness 60-63HRC. Features good wear
resistance, stable accuracy and long service life.
3. What types of NC thread gauges do you offer?
We supply Master Gauge and Working Gauge, available as Ring Gauge,
Plug Gauge or full Ring & Plug set. Some NC sizes are
interchangeable with old IF drill string connections.
