Pipe Reducer Dimensions - Concentric and Eccentric Reducer Dimensions

Concentric Pipe Reducer and Eccentric Pipe Reducer Dimensions are covered in ASME B16.9. Refer to the table given below for the size 1/2″ to 24″.

NOMINAL PIPE SIZE	OUTSIDE DIAMETER		END TO END
Inch	D	P	H
3/4 x 1/2	26.7	21.3	38
3/4 x 3/8	26.7	17.1	38
1 x 3/4	33.4	26.7	51
1 x 1/2	33.4	21.3	51
1 1/4 x 1	42.2	33.4	51
1 1/4 x 3/4	42.2	26.7	51
1 1/4 x 1/2	42.2	21.3	51
1 1/2 x 1 1/2	48.3	42.2	64
1 1/2 x 1	48.3	33.4	64
1 1/2 x 3/4	48.3	26.7	64
1 1/2 x 1/2	48.3	21.3	64
2 x 1 1/2	60.3	48.2	76
2 x 1 1/4	60.3	42.2	76
2 x 1	60.3	33.4	76
2 x 3/4	60.3	26.7	76
2 1/2 x 2	73	60.3	89
2 1/2 x 1 1/2	73	48.3	89
2 1/2 x 1 1/4	73	42.2	89
2 1/2 x 1	73	33.4	89
3 x 2 1/2	88.9	73	89
3 x 2	88.9	60.3	89
3 x 1 1/2	88.9	48.3	89
3 x 1 1/4	88.9	42.2	89
3 1/2 x 3	101.6	88.9	102
3 1/2 x 21/2	101.6	73	102
3 1/2 x 2	101.6	60.3	102
3 1/2 x 1 1/2	101.6	48.3	102
3 1/2 x 1 1/4	101.6	42.2	102
4 x 3 1/2	114.3	101.6	102
4 x 3	114.3	88.9	102
4 x 2 1/2	114.3	73	102
4 x 2	114.3	60.3	102
4 x 1 1/2	114.3	48.3	102
5 x 4	141.3	114.3	127
5 x 3 1/2	141.3	101.6	127
5 x 3	141.3	88.9	127
5 x 2 1/2	141.3	73	127
5 x 2	141.3	60.3	127
6 x 5	168.3	141.3	140
6 x 4	168.3	114.3	140
6 x 3 1/2	168.3	101.6	140
6 x 3	168.3	88.9	140
6 x 2 1/2	168.3	73	140
8 x 6	219.1	168.3	152
8 x 5	219.1	141.3	152
8 x 4	219.1	114.3	152
8 x 3 1/2	219.1	101.6	152
10 x 8	273.1	219.1	178
10 x 6	273.1	168.1	178
10 x 5	273.1	141.3	178
10 x 4	273.1	114.3	178
12 x 10	323.9	273.1	203
12 x 8	323.9	219.1	203
12 x 6	323.9	168.3	203
12 x 5	323.9	141.3	203
14 x 12	355.6	323.9	330
14 x 10	355.6	273.1	330
14 x 8	355.6	219.1	330
14 x 6	355.6	168.3	330
16 x 14	406.4	355.6	356
16 x 12	406.4	323.9	356
16 x 10	406.4	273.1	356
16 x 8	406.4	219.1	356
16 x 6	406.4	168.3	356
18 x 16	457	406.4	381
18 x 14	457	355.6	381
18 x 12	457	323.9	381
18 x 10	457	273.1	381
18 x 8	457	219.1	381
20 x 18	508	457	508
20 x 16	508	406.4	508
20 x 14	508	355.6	508
20 x 12	508	323.9	508
20 x 10	508	273.1	508
20 x 8	508	219.1	508
22 x 20	559	508	508
22 x 18	559	457	508
22 x 16	559	406.4	508
22 x 14	559	355.6	508
22 x 12	559	323.9	508
24 x 10	559	273.1	508
24 x 22	610	559	508
24 x 20	610	508	508
24 x 18	610	457	508
24 x 16	610	406.4	508
24 x 14	610	355.6	508
24 x 12	610	323.9	508
24 x 10	610	273.1	508
	All Dimensions are in mm

Pipe Fittings Dimensions Tolerance as per ASME B16.9

NOMINAL PIPE SIZE	ALL FITTINGS	ALL FITTINGS	ALL FITTINGS	ELBOWS AND TEES	180 DEG RETURN BENDS	180 DEG RETURN BENDS	180 DEG RETURN BENDS	REDUCERS	CAPS
NPS	O.D. at Bevel (1), (2)	I.D. at End (1), (3), (4)	Wall Thickness (3)	Centre-to-End Dimension A,B,C,M	Centre-to-Centre O	Back-to-Face K	Alignment of Ends U	Overall Length H	Overall Length E
½ to 2½	0.06 -0.03	0.03	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
3 to 3 ½	0.06	0.06		0.06	0.25	0.25	0.03	0.06	0.12
4	0.06	0.06		0.06	0.25	0.25	0.03	0.06	0.12
5 to 8	0.09 -0.06	0.06		0.06	0.25	0.25	0.03	0.06	0.25
10 to 18	0.16 -0.12	0.12		0.09	0.38	0.25	0.06	0.09	0.25
20 to 24	0.25 -0.19	0.19		0.09	0.38	0.25	0.06	0.09	0.25
26 to 30	0.25 -0.19	0.19		0.12	…	…	…	0.19	0.38
32 to 48	0.25 -0.19	0.19		0.19	…	…	…	0.19	0.38

NOMINAL PIPE SIZE NPS	ANGULARITY TOLERANCES	ANGULARITY TOLERANCES	ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
	Off Angle Q	Off Plane P	(1) Out-of-round is the sum of absolute values of plus and minus tolerance. (2) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9. (3) The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser. (4) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.
½ to 4	0.03	0.06
5 to 8	0.06	0.12
10 to 12	0.09	0.19
14 to 16	0.09	0.25
18 to 24	0.12	0.38
26 to 30	0.19	0.38
32 to 42	0.19	0.50
44 to 48	0.18	0.75

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