What is the thickness of API 5CT casing

The API full range of tubing and casing mainly refers to steel pipes conforming to the American Petroleum Institute's API SPEC 5CT standard, primarily used for the extraction of resources such as oil and natural gas. The tubing is used to extract oil or natural gas from oil wells. The casing serves as the wellbore wall for oil and gas wells.

API 5CT Casing and Tubing Specification

Team	Steel	Type	Total elongation under load %	Yield strength MPa		Tensile strength min MPa	Hardness a max		Specified wall thickness mm	Allowable hardness variationb HRC
Team	Steel	Type	Total elongation under load %	min	max	Tensile strength min MPa	HRC	HBW	Specified wall thickness mm	Allowable hardness variationb HRC
1	2	3	4	5	6	7	8	9	10	11
1	H40 J55 K55 N80 N80	- - - 1 Q	0.5 0.5 0.5 0.5 0.5	276 379 379 552 552	552 552 552 758 758	414 517 655 689 689	- - - - -	- - - - -	- - - - -	- - - - -
2	M65 L80 L80 L80 C90 C90 C90 C90 C95 T95 T95 T95 T95	- 1 9Cr 13Cr 1,2 1,2 1,2 1,2 - 1,2 1,2 1,2 1,2	0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5	448 552 552 552 621 621 621 621 655 655 655 655 655	586 655 655 655 724 724 724 724 758 758 758 758 758	586 655 655 655 689 689 689 689 724 724 724 724 724	22 23 23 23 25.4 25.4 25.4 25.4 - 25.4 25.4 25.4 25.4	235 241 241 241 255 255 255 255 - 255 255 255 255	- - - - ≤12.70 12.71～19.04 19.05～25.39 ≥25.40 - ≤12.70 12.71～19.04 19.05～25.39 ≥25.40	- - - - 3.0 4.0 5.0 6.0 - 3.0 4.0 5.0 6.0
3	P110	-	0.6	758	965	862	-	-	-	-
4	Q125 Q125 Q125	all all all	0.65 0.65 0.65	862 862 862	1034 1034 1034	931 931 931	b b b	- - -	≤12.70 12.71～19.04 ≥19.05	3.0 4.0 5.0