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Fitting Guide

Dimensions Butt Weld Reducers Concentric and Eccentric ASME B16.9

Reducers concentric and eccentric ASME B16.9
NPS O.D.
D
O.D.
D1
Len
H
3/4-1/2 26.7 21.3 38
1-1/2 33.4 21.3 51
1-3/4 33.4 26.7 51
1¼-1/2 42.2 21.3 51
1¼-3/4 42.2 26.7 51
1¼-1 42.2 33.4 51
1½-1/2 48.3 21.3 64
1½-3/4 48.3 26.7 64
1½-1 48.3 33.4 64
1½-1¼ 48.3 42.2 64
2-3/4 60.3 26.7 76
2-1 60.3 33.4 76
2-1¼ 60.3 42.2 76
2-1½ 60.3 48.3 76
Reducers concentric and eccentric ASME B16.9
NPS O.D.
D
O.D.
D1
Len
H
2½-1 73 33.4 89
2½-1¼ 73 42.2 89
2½-1½ 73 48.3 89
2½-2 73 60.3 89
3-1¼ 88.9 42.2 89
3-1½ 88.9 48.3 89
3-2 88.9 60.3 89
3-2½ 88.9 73 89
3½-1¼ 101.6 42.2 102
3½-1½ 101.6 48.3 102
3½-2 101.6 60.3 102
3½-2½ 101.6 73 102
3½-3 101.6 88.9 102
4-1½ 114.3 48.3 102
4-2 114.3 60.3 102
4-2½ 114.3 73 102
4-3 114.3 88.9 102
4-3½ 114.3 101.6 102
5-2 141.3 60.3 127
5-2½ 141.3 73 127
5-3 141.3 88.9 127
5-3½ 141.3 101.6 127
5-4 141.3 114.3 127
6-2½ 168.3 73 140
6-3 168.3 88.9 140
6-3½ 168.3 101.6 140
6-4 168.3 114.3 140
6-5 168.3 141.3 140
Reducers concentric and eccentric ASME B16.9
NPS O.D.
D
O.D.
D1
Len
H
8-3½ 219.1 101.6 152
8-4 219.1 114.3 152
8-5 219.1 141.3 152
8-6 219.1 168.3 152
10-4 273 114.3 178
10-5 273 141.3 178
10-6 273 168.3 178
10-8 273 219.1 178
12-5 323.9 141.3 203
12-6 323.9 168.3 203
12-8 323.9 219.1 203
12-10 323.9 273 203
14-6 355.6 168.3 330
14-8 355.6 219.1 330
14-10 355.6 273 330
14-12 355.6 323.9 330
16-8 406.4 219 356
16-10 406.4 273 356
16-12 406.4 323.9 356
16-14 406.4 355.6 356
18-10 457 273 381
18-12 457 323.9 381
18-14 457 355.6 381
18-16 457 406.4 381
20-12 508 323.9 508
20-14 508 355.6 508
20-16 508 406.4 508
20-18 508 457 508
22-14 559 355.6 508
22-16 559 406.4 508
22-18 559 457 508
22-20 559 508 508
Reducers concentric and eccentric ASME B16.9
NPS O.D.
D
O.D.
D1
Len
H
24-16 610 406.4 508
24-18 610 457 508
24-20 610 508 508
24-22 610 559 508
26-18 660 457 610
26-20 660 508 610
26-22 660 559 610
26-24 660 610 610
28-18 711 457 610
28-20 711 508 610
28-24 711 610 610
28-26 711 660 610
30-20 762 508 610
30-24 762 610 610
30-26 762 660 610
30-28 762 711 610
32-24 813 610 610
32-26 813 660 610
32-28 813 711 610
32-30 813 762 610
34-24 864 610 610
34-26 864 660 610
34-30 864 762 610
34-32 864 813 610
36-24 914 610 610
36-26 914 660 610
36-30 914 762 610
36-32 914 813 610
36-34 914 864 610
38-26 965 660 610
38-28 965 711 610
38-30 965 762 610
38-32 965 813 610
38-34 965 864 610
38-36 965 914 610
40-30 1016 762 610
40-32 1016 813 610
40-34 1016 864 610
40-36 1016 914 610
40-38 1016 965 610

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer.

Dimensional Tolerances of Concentric and Eccentric Reducers ASME B16.9

Nominal Pipe Size 1/2 to 2½ 3 to 3½ 4 5 to 8
Outside Diameter
at Bevel (D)
+ 1.6
- 0.8
1.6 1.6 + 2.4
- 1.6
Inside Diameter at End 0.8 1.6 1.6 1.6
Overall Length (H) 2 2 2 2
Nominal Pipe Size 10 to 18 20 to 24 26 to 30 32 to 48
Outside Diameter
at Bevel (D)
+ 4
- 3.2
+ 6.4
- 4.8
+ 6.4
- 4.8
+ 6.4
- 4.8
Inside Diameter at End 3.2 4.8 + 6.4
- 4.8
+ 6.4
- 4.8
Overall Length (H) 2 2 5 5
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted.

Concentric and Eccentric Reducer

Note:
MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 - NPS 24. Except with regard to the outside diameter at the bevel.

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