N.Y. Comp. Codes R. & Regs. tit. 12, § 14-8.1
(b) No tube to show an out-of-roundness at any point of the bend in excess of 5/32 inch as determined by calipering the outside of the tube, on a circumferential radial to the arc of the bend, and deducting the least diameter so found from the greater diameter,
out of roundness A and B measured at any point in the bend.