For steel pipes with a wall thickness greater than or equal to 0.049 in. (1.24 mm), the required value-based OD deviation can not exceed the specified value. For pipes with a wall thickness less than 0.049 in. (1.24 mm), the diameter tolerance of the pipe is negotiated by the manufacturer and the purchaser. The same time as

When ordered steel pipe diameter greater than 4 inches (101.6mm), for thin-walled pipe can increase the oval requirements. When the required wall thickness is less than 0.150 inches (3.81 mm), this is specified for thin-walled steel pipes. When ordering a thin-walled tube, the deviation between the maximum and minimum outside diameters measured in any cross of the profile shall be less than twice the permissible tolerance value of the specified value; however, the average diameter in the cross- Within the tolerance range.

Any point of wall thickness can not be greater than the required wall thickness of 12.5%