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Casing Coupling

casing coupling

Hot sale sizes: 7″ casing coupling, 9-5/8″ casing coupling, 13-3/8″ casing coupling, 20″ casing coupling

Hot sale threads for casing coupling: BTC, LTC, STC

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Casing Coupling
Pipe O.D. 4-1/2″, 5″, 5-1/2″, 6-5/8″, 7″, 7-5/8″, 8-5/8″, 9-5/8″, 10-3/4″, 11-3/4″, 13-3/8″, 16″, 18-5/8″, 20″
Grade H-40, J-55, K-55, C-75, L-80, N-80, C-95, P-110, L80-13CR
Thread Connection BTC, STC, LTC
Option Electro-zinc plated

Tubing Couplings


Hot sale sizes: 2-3/8″ tubing coupling, 2-7/8″ tubing coupling, 3-1/2″ tubing coupling, 4-1/2″ tubing coupling

Hot sale threads for tubing coupling: EUE, NUE, API 5CT

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Tubing Coupling

Pipe O.D.

1.900″, 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2″

J-55, C-75, L-80, N-80, C-95, P-110

Thread Connection


Electro-zinc plated




Sucker Rod Coupling

sucker rod coupling

Advanced thermal spraying technology is adopted to melt Ni alloy and other high wear-resisting materials on the blank surface of the collar after high temperature flame spraying, so as to reduce the friction coefficient between the anti-wear collar and the oil pipe to 0.01, which is an effective combination of high hardness and low friction, thus improving the service life of the rod and pipe in oil exploitation.

Type Grade O.D(mm) Minimum length(mm) Hardness Weight
3/4″ 19-T 41.05~41.43 101.6~103.17 56-62HRA 0.65 API 11B
7/8″ 22-T 45.75~46.13 45.75~46.13 56-62HRA 0.8 API 11B
1″ 25-T 55.35~55.73 55.35~55.73 12-23HRA 1.15 API 11B

Coupling Processing Diagram

Coupling pipe grade identification by paint color
Grade Color Coding (Painted Outside)
H-40 Black
J-55 or K-55 Green
N-80 Red
M-65 or L-80 Red with one Brown Band
L-80 Type 9CR Red with two Yellow Bands
L-80 Type 13CR Red with one Yellow Band
C-90 Type 1 Purple
C-90 Type 2 Purple with one Yellow Band
T-95 Type 1 Silver
T-95 Type 2 Silver with one Yellow Band
C-95 Brown
P-110 White
Q-125 Type 1 Orange
Q-125 Type 2 Orange with one Yellow Band
Q-125 Type 3 Orange with one Green Band
Q-125 Type 4 Orange with one Brown Band
Send Us Enquiry

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Why choose Lake Petro
Why choose Lake Petro?
Methods of Payment & Quality Control
Methods of Payment & Quality Control
Order procedure
What’s the order procedure?

Buyer’s Guide

Please send us your inquiry with detail item description or with Model number. If there is no packing demand we take it as our regular exported standard packing. We will offer you an order form for filling. We will recommend you the most suitable model according to information you offered.

We can give you really high quality products with competitive price. We have a better understanding in Chinese market, with us your money will be safe.

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Lake Petro is located in Dongying City, which is famous for Shengli Oilfield and the largest manufacturing hub of petroleum equipment in China. Following the principle of “quality first, science and technology innovated, people oriented”, every Lake Petro person is sparing no effort to provide the customers with best products and services. Our products are based on advanced production line and testing equipment, our products are designed and manufactured according to certification of ISO, GOST, etc.