7.3 Facings
Tolerances that apply to both flange and flanged fitting
facings are as follows:
(a) Inside and outside diameter of large and small
tongue and groove and female, ±0.5 mm (±0.02 in.).
(b) Outside diameter, 2.0 mm(0.06 in.) raised face, ±1.0
mm (±0.03 in.).
(c) Outside diameter, 7.0 mm(0.25 in.) raised face, ±0.5
mm (±0.02 in.).
(d) Ring joint groove tolerances are shown in Table 5
(Table II-5 of Mandatory Appendix II).
Tolerances that apply to flanges are as follows:
(e) Perpendicularity of the face with the bore
Size Tolerance
NPS ≤ 5 1 deg
NPS ≥ 6 0.5 deg