Special Thread Couplings, Zinc Diffusion , CorrosionResistant,Eight-Thread

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.

Minimum Order: 1 metric tons

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