Dimensional Tolerances for Reducers in Metric Units

Nominal Pipe Size	½ to 2½	3 to 3½	4	5 to 8	10 to 18	20 to 24	26 to 30	37 to 48
(DN)	15-65	80-90	100	125-200	250-450	500-600	650-750	800-1200
Outside Diameter at Bevel, D [Notes (1), and (2)]	+1.6 - 0.8	±1.6	±1.6	+2.4 - 1.6	+4.0 - 3.2	+6.4 - 4.8	+6.4 - 4.8	+6.4 - 4.8
Inside Diameter at End [Notes (1), (3), and (4)]	± 0.8	± 1.6	± 1.6	± 1.6	± 3.2	± 4.8	± 4.8	± 4.8
Wall Thickness, t [Note (3)]	Not Less Than 87.5% of Nominal Thickness
Overall Length of Reducers and Lap Joint Stub Ends, F, H	± 2	± 2	± 2	± 2	± 2	± 2	± 5	± 5

Notes:

Out-of-round use the sum of absolute values of plus and minus tolerances
This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of para. 2.2
The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.
Unless otherwise specified by the purchaser, these tolerances apply to the normal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.