API 5CT Casing & Tubing – Grades, Connections, and Dimensions

What is API 5CT？

API 5CT is the standard technical specification for Steel Casing and Tubing for oil wells in the petroleum and natural gas industry. In addition to casing and tubing, it includes pup joints, coupling stock, coupling materials, and accessory materials, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3).

Common Grades:

• J55/K55

• N80/N80Q/L80
• C90
• R95/T95
• P110/C110

• Q125

▶ For a detailed comparison of casing steel grades, see our [OCTG Casing & Tubing Grades Guide].

API Connections:

API 5CT is suitable for the following connections that comply with API SPEC 5B:

• SC: Short Round Thread Casing
• LC: Long Round Thread Casing
• BC: Buttress Thread Casing
• NU: Non-upset Tubing
• EU: External Upset Tubing

• IJ: Integral Tubing Connection

▶ For detailed information on API casing and tubing connections, please refer to our [API Coupling and Threads for Casing & Tubing].

4 Groups of Grade:

• Group 1: All casing and tubing in Grades H, J, K, N, and R

• Group 2: All casing and tubing in Grades C, L, M, and T
• Group 3: All casing and tubing in Grade P
• Group 4: All casing in Grade Q

Hunan Standard Steel Co., Ltd (HSCO) offers a full range of API Steel Casing and Tubing to meet the various needs of oil exploration and production. Below is a tubing and casing pipe chart, please read on to learn more.

API Tubing Dimensions and Weight Chart:

This section provides API 5CT tubing dimensions and weights. Use these tables for preliminary sizing and weight calculations.

API Steel Casing Pipe Dimensions and Weight Chart:

API 5CT casing dimensions and weights for common sizes (4-1/2″ to 20″). All values are nominal and based on API standards.

The following tables list chemical composition limits and mechanical property requirements per API 5CT. These values are for reference and design verification.

Chemical Composition in API 5CT Specification:

Mechanical Properties ——Tensile Properties:

Read more: 

●  Oil Well Casing and Tubing Knowledge 

●  Casing Pipe VS Drill Pipe

●  What is API 5CT? A Comprehensive Guide