Outer diameter, wall thickness and weight per meter for different classes, namely A, B and C of ERW (electro-resistance welded) pipes is given below for reference.
The tolerance and specifications as per Indian Standard 1239 can be viewed in the below PDF.
IS 1239-1 (2004): Steel Tubes, Tubulars and Other Wrought Steel Fittings, Part 1: Steel Tubes (BI-LINGUAL) (resource.org)