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Special Thread Couplings, Zinc Diffusion , CorrosionResistant,Eight-Thread 
You may also like
Sucker
Rod Couplings, Anti-Wear Couplings, Spray-Welded Couplings, Small Bore
Couplings Manufacturer: Tianjin Grand Victory Petroleum Equipment Co,.ltd.
In the
7-2 standard, 13 types of thread forms are included for drill pipe threads:
1. Numeric
(NC)
2. Regular
(REG)
3. Full
Hole (FH) - The above three have an internationally traceable gauge and
calibration system.
4. Internal
Flush (IF) - Has the same basic pitch diameter and all dimensions as the
Numeric V-038R.
5. External
Flush (EF) - Rarely used.
6. H90 -
A rotating shoulder connection with a 90° thread form and large cut.
7. Open
Hole (OH) - V-076 thread form.
8. GOST -
Russian standard symbols that can be interchanged with ISO as shown in the
table below.
9. Small
Hole (SH) - Can be interchanged with NC26, NC38.
10. PAC
Type - Small thread form ranging from 2 3/8 PAC to 3 1/2 PAC with a taper of
1:8.
11. Extra
Hole (XH)
12. Double
Stream Line (DSL)
13. Wide
Open (WO)
The SY
standard stipulates: 1 Internal Flush, 2 Full Hole, 3 Regular, which are IF,
FH, REG respectively. The commonly used ones are 410, 411, 520, 521, 630, 631,
where the last digit 1 indicates male thread and 0 indicates female thread.
With fast
delivery and high quality, we help customers reduce costs and increase
efficiency. Our vision is to build an international petroleum pipeline
equipment enterprise through integrity and innovation. We welcome leaders and
friends from all sectors to visit and cooperate for mutual development.
1. Since
2008, we have 17 years of experience, a registered capital of 11.18 million
RMB, an 8,000 m² workshop, and an annual foreign trade turnover of 20 million
RMB.
2. We
have import and export rights, ISO 9001 quality system certification, API 5CT
certification from the American Petroleum Institute, and multiple national
patent certificates.
3. Our
production workshop is equipped with several highprecision CNC lathes, thread
rolling machines, hydraulic pressure machines, and complete inspection
instruments.
4. Our
products include J55, K55, N801/Q, L80, and P110 oil casings, couplings, short
joints, and conversion joints.
5. We
maintain a stock of high corrosionresistant oil casings, including 80S, 90S,
110S, and L801Cr/3Cr/13Cr, with an annual inventory of around 2,000 tons.
6. We
provide processing services for special sealing threads, including direct
connection types, trapezoidal shapes, doublestep, and variable pitch threading,
producing tens of thousands of special couplings each year.
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