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About This Item


Full Description

Please note. Any addenda or errata may not be included in translated editions of this standard.

This standard specifies the technical delivery conditions for steel pipes (casing, tubing, and pup joints), coupling stock, coupling material, and accessory material, and establishes requirements for three product specification levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all grades except H-40, L-80 9Cr, and C110, are provided.

For pipes covered by this standard, the sizes, masses, and wall thicknesses, as well as grades and applicable end-finishes, are provided. API 5L pipe may be ordered as casing in accordance with API 5C6.

By agreement between the purchaser and manufacturer, this standard can also be applied to other plain-end pipe sizes and wall thicknesses. The products to which this standard is applicable include the following grades: H40, J55, K55, N80 all types, L80 all types, C90, R95, T95, P110, C110, and Q125.

This standard is applicable to the following connections in accordance with API Spec 5B:
  • short round thread casing (STC);
  • long round thread casing (LC);
  • buttress thread casing (BC);
  • extreme-line casing (XC);
  • non-upset tubing (NU);
  • external upset tubing (EU);
  • integral joint tubing (IJ).

Document History

  1. API Spec 5CT


    Specification for Casing and Tubing, Tenth Edition, Includes Errata 1 (2018) and Errata 2 (2019)

    • Most Recent
  2. API Spec 5CT

    Specification for Casing and Tubing, Ninth Edition, Includes Errata 1 (2012), Errata 2 (2016)

    • Historical Version
  3. 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

    • Historical Version
  4. API Spec 5CT

    Specification for Casing and Tubing

    • Historical Version
  5. API 5CT

    Specification for Casing and Tubing (U.S. Customary Units)

    • Historical Version
  6. API 5A

    Casing, Tubing, and Drill Pipe - WITHDRAWN - Incorporated into 5D and 5CT

    • Historical Version
  7. API 5a

    Specifications for Steel and Iron Pipe for Oil Country Tubular Goods, 1st Edition

    • Historical Version

Amendments, rulings, supplements, and errata

  1. API Spec 5CT Errata 2


    Errata to Specification for Casing and Tubing, Tenth Edition

  2. API Spec 5CT Errata 1


    Errata to Specification for Casing and Tubing, Tenth Edition