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Product Details:

  • Revision: 10th Edition, June 2018
  • Published Date: June 2020
  • Status: Active, Most Current
  • Document Language: English
  • Published By: American Petroleum Institute (API)
  • Page Count: 306
  • ANSI Approved: No
  • DoD Adopted: No


Description / Abstract:

API SPEC 5CT, 10th Edition, June 2018 - Casing and Tubing


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, and 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. 


This standard is applicable to the following connections in accordance with API 5B: 

— short round thread casing (SC) 

— long round thread casing (LC) 

— buttress thread casing (BC) 

— non-upset tubing (NU) 

— external upset tubing (EU) 

— integral tubing (IJ) 

For such connections, this standard specifies the technical delivery conditions for couplings and thread protection. Supplementary requirements that can optionally be agreed upon for enhanced leak resistance connections (LC) are provided. 

This standard can also be applied to tubulars with connections not covered by API standards. 

This standard is not applicable to threading requirements. 

NOTE Dimensional requirements on threads and thread gauges, stipulations on gauging practice, gauge specifications, as well as instruments and methods for inspection of threads, are given in API 5B. 


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. 

Supplementary Requirements

Supplementary requirements that may be specified by the purchaser or agreed between purchaser and manufacturer for non-destructive examination, fully machined coupling blanks, upset casing, electric-welded casing, tubing and pup joints, impact testing, seal-ring couplings, tensile testing, and sulfide stress cracking testing are provided. 

Application of the API Monogram

If the product is manufactured at a facility licensed by API and is intended to be supplied bearing the API Monogram, the requirements of Annex A apply.

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