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API 5CT Casing
API 5CT Casing

API 5CT Casing


Well casing


Oil well casing serves as well sidewall

Pipe Standard



OD: 114.3-508mm

WT: 5.21-16.13mm

Thread types

STC, LTC, BTC, special clearance,  premium connection

  • Description
  • Specification
  • Standard
  • Process
  • Packing

What is API 5CT casing ?

API SPEC 5CT well casing is utilized in fixing the well wall or down hole, which has wider diameters. API SPEC 5CT can be divided into conductor casing, technical casing and oil casing.


API 5CT is standard technical specifications for steel casing pipes used for oil wells in petroleum and natural gas industries.

Common Grades

• J55/K55

• N80/N80Q/L80

• C90

• R95/T95

• P110/C110

• Q125



API 5CT is applicable to following connections which complied with API SPEC 5B:

• SC: Short round thread casing

• LC: Long ound thread casing

• BC: Buttress thread casing

• NU: Non-upset tubing

• EU: External upset tubing

• IJ: Integral tubing connections

More casing pipes and their colors

API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells

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Seamless Structural Pipe,Low Temperature Pipe,High Temperature Alloy Steel Tube