Dimensions of ASME B16.9 Reducers

Nominal Size	Outside Diameter at Bevel	Outside Diameter at Bevel	End to End
NPS	Large End mm. in.	Small End mm. in.	H mm. in.
3/4 x 1/2	26.7 1.05	21.3 0.84	38 1.50
3/4 x 3/8	26.7 1.05	17.3 0.68	38 1.50
1 x 3/4	33.4 1.32	26.7 1.05	51 2.00
1 x 1/2	33.4 1.32	21.3 0.84	51 2.00
1 1/4 x 1	42.2 1.66	33.4 1.32	51 2.00
1 1/4 x 3/4	42.2 1.66	26.7 1.05	51 2.00
1 1/4 x 1/2	42.2 1.66	21.3 0.84	51 2.00
1 1/2 x 1 1/4	48.3 1.90	42.2 1.66	64 2.50
1 1/2 x 1	48.3 1.90	33.4 1.32	64 2.50
1 1/2 x 3/4	48.3 1.90	26.7 1.05	64 2.50
1 1/2 x 1/2	48.3 1.90	21.3 0.84	64 2.50
2 x 1 1/2	60.3 2.38	48.3 1.90	76 3.00
2 x 1 1/4	60.3 2.38	42.2 1.66	76 3.00
2 x 1	60.3 2.38	33.4 1.32	76 3.00
2 x 3/4	60.3 2.38	26.7 1.05	76 3.00
2 1/2 x 2	73.0 2.88	60.3 2.38	89 3.50
2 1/2 x 1 1/2	73.0 2.88	48.3 1.90	89 3.50
2 1/2 x 1 1/4	73.0 2.88	42.2 1.66	89 3.50
2 1/2 x 1	73.0 2.88	33.4 1.32	89 3.50
3 x 2 1/2	88.9 3.50	73.0 2.88	89 3.50
3 x 2	88.9 3.50	60.3 2.38	89 3.50
3 x 1 1/2	88.9 3.50	48.3 1.90	89 3.50
3 x 1 1/4	88.9 3.50	42.2 1.66	89 3.50
3 1/2 x 3	101.6 4.00	88.9 3.50	102 4.00
3 1/2 x 2 1/2	101.6 4.00	73.0 2.88	102 4.00
3 1/2 x 2	101.6 4.00	60.3 2.38	102 4.00
3 1/2 x 1 1/2	101.6 4.00	48.3 1.90	102 4.00
3 1/2 x 1 1/4	101.6 4.00	42.2 1.66	102 4.00
4 x 3 1/2	114.3 4.50	101.6 4.00	102 4.00
4 x 3	114.3 4.50	88.9 3.50	102 4.00
4 x 2 1/2	114.3 4.50	73.0 2.88	102 4.00
4 x 2	114.3 4.50	60.3 2.38	102 4.00
4 x 1 1/2	114.3 4.50	48.3 1.90	102 4.00
5 x 4	141.3 5.56	114.3 4.50	127 5.00
5 x 3 1/2	141.3 5.56	101.6 4.00	127 5.00
5 x 3	141.3 5.56	88.9 3.50	127 5.00
5 x 2 1/2	141.3 5.56	73.0 2.88	127 5.00
5 x 2	141.3 5.56	60.3 2.38	127 5.00
6 x 5	168.3 6.62	141.3 5.56	140 5.50
6 x 4	168.3 6.62	114.3 4.50	140 5.50
6 x 3 1/2	168.3 6.62	101.6 4.00	140 5.50
6 x 3	168.3 6.62	88.9 3.50	140 5.50
6 x 2 1/2	168.3 6.62	73.0 2.88	140 5.50
8 x 6	219.1 8.62	168.3 6.62	152 6.00
8 x 5	219.1 8.62	141.3 5.56	152 6.00
8 x 4	219.1 8.62	114.3 4.50	152 6.00
8 x 3 1/2	219.1 8.62	101.6 4.00	152 6.00
10 x 8	273.0 10.75	219.1 8.62	178 7.00
10 x 6	273.0 10.75	168.3 6.62	178 7.00
10 x 5	273.0 10.75	141.3 5.56	178 7.00
10 x 4	273.0 10.75	114.3 4.50	178 7.00
12 x 10	323.8 12.75	273.0 10.75	203 8.00
12 x 8	323.8 12.75	219.1 8.62	203 8.00
12 x 6	323.8 12.75	168.3 6.62	203 8.00
12 x 5	323.8 12.75	141.3 5.56	203 8.00
14 x 12	355.6 14.00	323.8 12.75	330 13.00
14 x 10	355.6 14.00	273.0 10.75	330 13.00
14 x 8	355.6 14.00	219.1 8.62	330 13.00
14 x 6	355.6 14.00	168.3 6.62	330 13.00
16 x 14	406.4 16.00	355.6 14.00	356 14.00
16 x 12	406.4 16.00	323.8 12.75	356 14.00
16 x 10	406.4 16.00	273.0 10.75	356 14.00
16 x 8	406.4 16.00	219.1 8.62	356 14.00
18 x 16	457 18.00	406.4 16.00	381 15.00
18 x 14	457 18.00	355.6 14.00	381 15.00
18 x 12	457 18.00	323.8 12.75	381 15.00
18 x 10	457 18.00	273.0 10.75	381 15.00

*All dimensions are furnished in both SI(metric) units and US Customary units.
*Both concentric & eccentric reducers can be furnished with bell-shaped or conical body. However, the bell-shaped reducer is preferred.
View more specification of ASME B16.9.