Pipe Fittings

Tolerance For butt Welding Fittings

Tolerances are in millimeters. mm

ASME / ANSI B16.9
All Fittings				90?/span>, 45?/span> Elbows and Tees	Reducers	Caps	180?/span> Returns			Angularity Tolerance
Nominal Pipe Size	Outside Diameter at Bevel	Inside Diameter at End	Wall Thickness	Center to End Dimension	Overall Length	Overall Length	Center to Center Dimension	Back to face Dimension	Alignment of Ends	Nominal Pipe Size	off Angle	off Plane
(in)	D	ĄĄ	t	A.B.C.M	H	E	O	K	U	(in)	Q	P
¹/₂to 2¹/₂	+1.52-0.76	0.76	Not Less Than 87.5% of Nominal Thickness	1.52	1.52	3.05	6.35	6.35	0.76	¹/₂to 4	0.76	1.51
3 to 3¹/₂	1.52	1.52		1.52	1.52	3.05	6.35	6.35	0.75	5 to 8	1.52	3.05
4	1.52	1.52		1.52	1.52	3.05	6.35	6.36	0.76	10 to 12	2.29	4.83
5 to 8	+2.29-1.52	1.52		1.52	1.52	6.35	6.35	6.35	0.76	14 to 16	2.29	6.35
10 to 18	+4.06-3.05	3.05		2.29	2.29	6.35	9.65	6.35	1.52	18 to 24	3.05	9.65
20 to 24	+6.35-4.83	4.83		2.29	2.29	6.35	9.65	6.35	1.52	26 to 30	4.83	9.65
26 to 30	+6.35-4.83	4.83		3.05	4.83	9.65	-	-	-	32 to 36	4.83	12.7
32 to 36	+6.35-4.83	4.83		4.83	4.83	9.65	-	-	-	ĄĄ