BTC STC LTC Thread Coupling according to API

Model: NS-1 16" Casing Coupling
Place of Origin: Shaanxi,China (Mainland)
Head Code: Square
Shape: Equal
Technics: Forged
Type: Coupling
Material: Iron
Connection: Flange
Brand Name: KW
Grade: K55
Material: API 5CT Seamless Steel Pipe
Surface Treatment: Whole phosphating, or inside phosphating and outside coating
Color: green on surface and black inside thread
Threading: 8rd
Brand: KW
Standard: API 5CT 9TH
Usage: Well Drilling Machinery
Class: Pipe Fittings
Supply ability: 10000pcs per month

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Product Description

Payment & Shipping Terms Supply Capacity
Unit Price:50.0 USDProduction Capacity:10000 per month
Trade Term:FOBPacking:Standard Export...
Payment Terms:L/C, D/P, D/A, T/T, WUDelivery Date:20 days after received...
Min. Order:1 Piece/Pieces
Means of Transport:Ocean, Air, Land

BTC STC LTC Thread Coupling according 

Kingwell tube and tool joint inspections are carried out in accordance with standards like API Inspections of drill pipes, casings, tubings or tools are usually performed based on the following international standards:

· API, API 5CT, API 5L

BTC STC LTC Thread Coupling Detail:

Visual Tube Body Inspection

A thorough visual inspection of possible noticeable external damages inflicted is performed; most damages encountered arise from handling of the casing, 

such as major dents and mashes. Other types of flags will be external corrosion, laps, and straightness.

Visual Thread Inspection
(API & Premium Connections)

Thread Protectors are removed and both pin and box ends are thoroughly cleaned and visually evaluated for any obvious defects or mechanical damages, 

such as dents, corrosion, galled threads, etc.
Premium threads are inspected to evaluate the condition of the seals, threads and for any mechanical damages like dents, corrosion, galled threads, etc.
API Dope is applied to the threads and thread protectors are installed. The dope shall be supplied by the customer.

API Drifting (Full Length)

Drift mandrels conforming to API Specifications are passed through the full length of each tube to assure compliance with API internal diameter 

specifications. If a mashed or dented area prevents drift, the location is noted on the inspection report and marked physically on the pipe.

Special Clearance Drift – Full Length

Special clearance drift mandrels, furnished by the customer, are passed through the full length of each tube to determine special clearances on the

 internal diameter. This is not an API inspection and is usually performed to assure passage of special tools or oversize bits.

Magnetic Particle Inspection (MPI)

Pipe is magnetized with a DC magnetizing coil with variable current to provide active longitudinal magnetization for detection of transverse flaws.

Electromagnetic Inspection (EMI)

Buggy Inspection Unit is used for transverse defect inspection.

Hardness Testing

Portable Hardness Testers are utilized to perform hardness reading on the pipe.

Wall Thickness Measurements

Ultrasonic Measurement: Ultrasonic wall thickness tests are utilized to determine the minimum and maximum wall thickness at any one area on a tube.

 A test consists of taking as many circumferential measurements as required to determine the minimum and maximum wall thickness in one area. 
Micrometer Measurement: Micrometer measurements are utilized in measuring the wall thickness on the ends of plain end pipe.
Ultrasonic Wall Verification: Ultrasonic wall thickness test to verify that the tube body, in general, satisfies nominal wall thickness requirements.

API Thread Gauging

API eight round and buttress threads are gauged with mechanical instruments to determine compliance on taper, lead and height. At the same time, 

the threads are examined for visual defects.

Company Profile:


Xi'an Kingwell Oilfield Machinery Co.,Ltd is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provide complete solutions.


With over 10 years developing, we were developed from the beginning drilling service to manufacture factory who produce OCTG, DST tools and Solid Control products


KINGWELL have experienced team, stronger enough to meet any challenge, we do believe honest is the base of business and cooperation, our aim is to build solid relationship with any part of honest. kingwell can provide highly efficient services to its clients resulting in accurate and timely deliveries at the best prices.
It is a professional supplier for oilfield products according to the API standard. We exporting ALL KINDS OF OILFIELD MACHINERY AND TOOLS with super Quality and Competitive Price in CHINA.   

Packaging: wood case or steel carton

BTC STC LTC Thread Coupling according to API 5CT &5B

Product delivery


Payment:TT/LC:30% advance payment.70%before shipment

Warranty: Warranty period is 1 year after installation.

Origin: China



Category: API 5CT Casing Couplings

Related Category: Pup Joints  Casing and Tubing  API 5CT Tubing Couplings