Reducers

Optimized diameter transition for welded piping systems
Carbon steel reducers are engineered to provide a controlled transition between different nominal pipe sizes in welded piping systems. Their design ensures uniform stress distribution and stable flow conditions, reducing the risk of turbulence, pressure loss, and mechanical overload at diameter change points.
Hide all dimensions Show all dimensions
Standard
DN
OD1
WT1
OD2
WT2
H
m
EN 10253-2
25 x 15
33.7
2.6
21.3
2
51
0.10
EN 10253-2
25 x 15
33.7
2.6
21.3
2.6
51
0.10
EN 10253-2
25 x 15
33.7
3.2
21.3
2.6
51
0.12
EN 10253-2
25 x 20
33.7
2.6
26.9
2.3
51
0.10
EN 10253-2
25 x 20
33.7
3.2
26.9
2.6
51
0.12
EN 10253-2
32 x 15
42.4
2.6
21.3
2
51
0.13
EN 10253-2
32 x 15
42.4
3.6
21.3
2.6
51
0.18
EN 10253-2
32 x 15
42.4
3.6
21.3
3.2
51
0.17
EN 10253-2
32 x 20
42.4
2.6
26.9
2.3
51
0.13
EN 10253-2
32 x 20
42.4
3.6
26.9
2.6
51
0.18
EN 10253-2
32 x 25
42.4
2.6
33.7
2.6
51
0.13
EN 10253-2
32 x 25
42.4
3.6
33.7
3.2
51
0.18
EN 10253-2
40 x 20
48.3
2.6
26.9
2.3
64
0.19
EN 10253-2
40 x 20
48.3
3.6
26.9
2.6
64
0.25
EN 10253-2
40 x 20
48.3
4
26.9
3.2
64
0.28
EN 10253-2
40 x 25
48.3
2.6
33.7
2.6
64
0.19
EN 10253-2
40 x 25
48.3
3.6
33.7
3.2
64
0.25
EN 10253-2
40 x 25
48.3
4
33.7
4
64
0.28
EN 10253-2
40 x 25
48.3
5
33.7
4.5
63
0.34
EN 10253-2
40 x 32
48.3
3.6
42.4
3.6
64
0.25
EN 10253-2
40 x 32
48.3
2.6
42.4
2.6
64
0.19
EN 10253-2
40 x 32
48.3
3.6
42.4
3.6
64
0.25
EN 10253-2
40 x 32
48.3
4
42.4
4
64
0.28
EN 10253-2
40 x 32
48.3
5
42.4
5
64
0.34
EN 10253-2
40 x 32
48.3
6.3
42.4
6.3
64
0.42
EN 10253-2
50 x 25
60.3
4
33.7
4
76
0.42
EN 10253-2
50 x 25
60.3
5.6
33.7
4.5
76
0.57
EN 10253-2
50 x 32
60.3
2.9
42.4
2.6
76
0.31
EN 10253-2
50 x 32
60.3
3.6
42.4
3.6
76
0.38
EN 10253-2
50 x 32
60.3
4
42.4
4
76
0.42
EN 10253-2
50 x 32
60.3
5.6
42.4
5
76
0.57
EN 10253-2
50 x 40
60.3
4
48.3
4
76
0.42
EN 10253-2
50 x 40
60.3
5.6
48.3
5
76
0.57
EN 10253-2
50 x 40
60.3
7.1
48.3
6.3
76
0.71
EN 10253-2
65 x 25
76.1
2.9
33.7
2.6
89
0.47
EN 10253-2
65 x 25
76.1
3.6
33.7
3.2
89
0.57
EN 10253-2
65 x 25
76.1
4.5
33.7
3.2
89
0.79
EN 10253-2
65 x 25
76.1
5.6
33.7
4
89
0.87
EN 10253-2
65 x 25
76.1
7.1
33.7
4.5
89
1.09
EN 10253-2
65 x 32
76.1
2.9
42.4
2.6
89
0.47
EN 10253-2
65 x 32
76.1
3.6
42.4
3.6
89
0.57
EN 10253-2
65 x 32
76.1
4.5
42.4
3.6
89
0.79
EN 10253-2
65 x 32
76.1
5.6
42.4
3.6
89
0.87
EN 10253-2
65 x 32
76.1
7.1
42.4
5
89
1.08
EN 10253-2
65 x 40
76.1
2.9
48.3
2.6
89
0.47
EN 10253-2
65 x 40
76.1
3.6
48.3
3.6
89
0.57
EN 10253-2
65 x 40
76.1
4.5
48.3
4
89
0.79
EN 10253-2
65 x 40
76.1
5.6
48.3
4
89
0.87
EN 10253-2
65 x 40
76.1
7.1
48.3
5
89
1.08
EN 10253-2
65 x 40
76.1
2.9
48.3
2.6
89
0.47
EN 10253-2
65 x 40
76.1
3.6
48.3
3.6
89
0.57
EN 10253-2
65 x 40
76.1
4.5
48.3
4
89
0.79
EN 10253-2
65 x 40
76.1
5.6
48.3
4
89
0.87
EN 10253-2
65 x 40
76.1
7.1
48.3
5
89
1.08
EN 10253-2
65 x 50
76.1
2.9
60.3
2.9
89
0.47
EN 10253-2
65 x 50
76.1
3.6
60.3
3.6
89
0.57
EN 10253-2
65 x 50
76.1
5.6
60.3
4
89
0.87
EN 10253-2
65 x 50
76.1
7.1
60.3
5.6
89
1.08
EN 10253-2
80 x 25
88.9
3.2
33.7
2.6
89
0.61
EN 10253-2
80 x 25
88.9
4.5
33.7
4
89
1.04
EN 10253-2
80 x 25
88.9
5.6
33.7
4.5
89
1.04
EN 10253-2
80 x 32
88.9
3.2
42.4
2.6
89
0.61
EN 10253-2
80 x 32
88.9
4
42.4
3.6
89
0.75
EN 10253-2
80 x 32
88.9
5.6
42.4
4
89
1.02
EN 10253-2
80 x 32
88.9
8
42.4
5
89
1.42
EN 10253-2
80 x 32
88.9
8
42.4
6.3
89
1.55
EN 10253-2
80 x 40
88.9
3.2
48.3
2.6
89
0.6
EN 10253-2
80 x 40
88.9
4
48.3
3.6
89
0.75
EN 10253-2
80 x 40
88.9
5.6
48.3
4
89
1.02
EN 10253-2
80 x 40
88.9
8
48.3
5.6
89
1.42
EN 10253-2
80 x 50
88.9
3.2
60.3
2.9
89
0.6
EN 10253-2
80 x 50
88.9
4
60.3
3.6
89
0.75
EN 10253-2
80 x 50
88.9
5.6
60.3
4
89
1.02
EN 10253-2
80 x 50
88.9
8
60.3
5.6
89
1.42
EN 10253-2
80 x 65
88.9
4
76.1
3.6
89
0.75
EN 10253-2
80 x 65
88.9
5.6
76.1
5.6
89
1.02
EN 10253-2
80 x 65
88.9
8
76.1
7.1
88
1.42
EN 10253-2
100 x 32
114.3
3.6
42.4
2.6
102
0.98
EN 10253-2
100 x 32
114.3
5.6
42.4
4
102
0.98
EN 10253-2
100 x 32
114.3
6.3
42.4
3.6
102
1.68
EN 10253-2
100 x 32
114.3
8.8
42.4
4
102
2.29
EN 10253-2
100 x 40
114.3
3.6
48.3
2.6
102
100
EN 10253-2
100 x 40
114.3
4.5
48.3
3.6
102
1.24
EN 10253-2
100 x 40
114.3
6.3
48.3
4
102
1.71
EN 10253-2
100 x 40
114.3
8.8
48.3
5
102
2.34
EN 10253-2
100 x 50
114.3
4.5
60.3
3.6
102
1.24
EN 10253-2
100 x 50
114.3
6.3
60.3
4.5
102
1.71
EN 10253-2
100 x 50
114.3
8.8
60.3
5.6
102
2.34
EN 10253-2
100 x 65
114.3
3.6
76.1
2.9
102
1.00
EN 10253-2
100 x 65
114.3
4.5
76.1
3.6
102
1.24
EN 10253-2
100 x 65
114.3
6.3
76.1
5.6
102
1.71
EN 10253-2
100 x 65
114.3
8.8
76.1
7.1
102
2.34
EN 10253-2
100 x 80
114.3
3.6
88.9
3.2
102
1.00
EN 10253-2
100 x 80
114.3
4.5
88.9
4
102
1.24
EN 10253-2
100 x 80
114.3
6.3
88.9
5.6
102
1.71
EN 10253-2
100 x 80
114.3
8.8
88.9
8
102
2.34
EN 10253-2
125 x 50
139.7
5
60.3
3.6
127
2.11
EN 10253-2
125 x 50
139.7
6.3
60.3
4
127
2.63
EN 10253-2
125 x 50
139.7
8.8
60.3
5.6
127
4.06
EN 10253-2
125 x 65
139.7
4
76.1
2.9
127
1.70
EN 10253-2
125 x 65
139.7
5
76.1
3.6
127
2.11
EN 10253-2
125 x 65
139.7
6.3
76.1
5.6
127
2.63
EN 10253-2
125 x 65
139.7
8.8
76.1
6.3
127
2.36
EN 10253-2
125 x 65
139.7
10
76.1
7.1
127
4.06
EN 10253-2
125 x 80
139.7
4
88.9
3.2
127
1.70
EN 10253-2
125 x 80
139.7
5
88.9
4
127
2.11
EN 10253-2
125 x 80
139.7
6.3
88.9
5.6
127
2.63
EN 10253-2
125 x 80
139.7
8.8
88.9
6.3
127
2.63
EN 10253-2
125 x 80
139.7
10
88.9
8
127
4.06
EN 10253-2
125 x 100
139.7
4
114.3
3.6
127
1.70
EN 10253-2
125 x 100
139.7
5
114.3
4.5
127
2.11
EN 10253-2
125 x 100
139.7
6.3
114.3
6.3
127
2.63
EN 10253-2
125 x 100
139.7
8,8
114.3
6.3
127
2.63
EN 10253-2
125 x 100
139.7
10
114.3
8.8
127
4.06
EN 10253-2
150 x 50
168.3
4.5
60.3
2.9
140
2.54
EN 10253-2
150 x 50
168.3
7.1
60.3
4.5
140
3.95
EN 10253-2
150 x 65
168.3
4.5
76.1
2.9
140
2.54
EN 10253-2
150 x 65
168.3
5.6
76.1
3.6
140
3.15
EN 10253-2
150 x 65
168.3
7.1
76.1
5.6
140
3.95
EN 10253-2
150 x 65
168.3
8.8
76.1
6.3
140
3.95
EN 10253-2
150 x 65
168.3
11
76.1
7.1
140
5.97
EN 10253-2
150 x 80
168.3
4.5
88.9
3.2
140
2.54
EN 10253-2
150 x 80
168.3
5.6
88.9
4
140
3.15
EN 10253-2
150 x 80
168.3
7.1
88.9
5.6
140
3.95
EN 10253-2
150 x 80
168.3
8.8
88.9
6.3
140
3.95
EN 10253-2
150 x 100
168.3
4.5
114.3
3.6
140
2.54
EN 10253-2
150 x 100
168.3
5.6
114.3
4.5
140
3.15
EN 10253-2
150 x 100
168.3
7.1
114.3
6.3
140
3.95
EN 10253-2
150 x 100
168.3
11
114.3
8.8
140
5.97
EN 10253-2
150 x 125
168.3
4.5
139.7
4
140
2.54
EN 10253-2
150 x 125
168.3
5.6
139.7
5
140
3.15
EN 10253-2
150 x 125
168.3
7.1
139.7
6.3
140
3.95
EN 10253-2
150 x 125
168.3
8.8
139.7
6.3
140
3.95
EN 10253-2
150 x 125
168.3
11
139.7
10
140
5.97
EN 10253-2
200 x 80
219.1
6.3
88.9
3.2
152
5.03
EN 10253-2
200 x 80
219.1
7.1
88.9
4
152
5.64
EN 10253-2
200 x 80
219.1
8
88.9
5.6
152
6.33
EN 10253-2
200 x 100
219.1
6.3
114.3
3.6
152
5.03
EN 10253-2
200 x 100
219.1
7.1
114.3
5.6
152
5.64
EN 10253-2
200 x 100
219.1
8
114.3
6.3
152
6.33
EN 10253-2
200 x 125
219.1
6.3
139.7
4
152
5.03
EN 10253-2
200 x 125
219.1
7.1
139.7
5
152
5.64
EN 10253-2
200 x 125
219.1
8
139.7
6.3
152
6.33
EN 10253-2
200 x 150
219.1
6.3
168.3
4.5
152
5.03
EN 10253-2
200 x 150
219.1
7.1
168.3
5.6
152
5.64
EN 10253-2
200 x 150
219.1
8
168.3
7.1
152
6.33
EN 10253-2
250 x 100
273
6.3
114.3
3.6
178
7.38
EN 10253-2
250 x 100
273
8.8
114.3
4.5
178
10.21
EN 10253-2
250 x 100
273
10
114.3
6.3
178
11.55
EN 10253-2
250 x 125
273
6.3
139.7
4
178
7.38
EN 10253-2
250 x 125
273
8.8
139.7
5
178
10.21
EN 10253-2
250 x 125
273
10
139.7
6.3
178
11.55
EN 10253-2
250 x 150
273
6.3
168.3
4.5
178
7.38
EN 10253-2
250 x 150
273
8.8
168.3
5.6
178
10.21
EN 10253-2
250 x 150
273
10
168.3
7.1
178
11.55
EN 10253-2
250 x 200
273
6.3
219.1
6.3
178
7.38
EN 10253-2
250 x 200
273
8.8
219.1
7.1
178
10.21
EN 10253-2
250 x 200
273
10
219.1
8
178
11.55
ASME B16.9
1" X ½"
33.4
3.38 (STD/40)
21.3
2.77 (STD/40)
51
0.13
ASME B16.9
1" X ¾"
33.4
3.38 (STD/40)
26.7
2.87 (STD/40)
51
0.13
ASME B16.9
1¼" X 1⁄2"
42.2
3.56 (STD/40)
20.3
2.77 (STD/40)
51
0.17
ASME B16.9
1¼" X ¾"
42.2
3.56 (STD/40)
26.7
2.87 (STD/40)
51
0.17
ASME B16.9
1¼" X 1"
42.2
3.56 (STD/40)
33.4
3.38 (STD/40)
51
0.17
ASME B16.9
1½" X ¾"
48.3
3.68 (STD/40)
26.7
2.87 (STD/40)
64
0.25
ASME B16.9
1½" X 1"
48.3
3.68 (STD/40)
33.4
3.38 (STD/40)
64
0.25
ASME B16.9
1½" X 1"
48.3
5.08 (XS/80)
33.4
4.55 (XS/80)
64
0.34
ASME B16.9
1½" X 1¼"
48.3
3.68 (STD/40)
42.2
3.56 (STD/40)
64
0.25
ASME B16.9
1½" X 1¼"
48.3
5.08 (STD/40)
42.2
4.85 (STD/40)
64
0.34
ASME B16.9
1½" X 1¼"
48.3
7.14 (160)
42.2
6.35 (160)
64
0.46
ASME B16.9
2" X 1"
60.3
3.91 (STD/40)
33.4
3.38 (STD/40)
76
0.42
ASME B16.9
2" X 1"
60.3
5.54 (XS/80)
33.4
4.55 (XS/80)
76
0.57
ASME B16.9
2" X 1¼"
60.3
3.91 (STD/40)
42.2
3.56 (STD/40)
76
0.42
ASME B16.9
2" X 1¼"
60.3
5.54 (XS/80)
42.2
4.85 (XS/80)
76
0.57
ASME B16.9
2" X 1½"
60.3
3.91 (STD/40)
48.3
3.68 (STD/40)
76
0.42
ASME B16.9
2" X 1½"
60.3
5.54 (XS/80)
48.3
5.08 (XS/80)
76
0.57
ASME B16.9
2½" X 1¼"
73
5.16 (STD/40)
42.2
3.56 (STD/40)
89
0.83
ASME B16.9
2½" X 1¼"
73
7.01 (XS/80)
42.2
4.85 (XS/80)
89
1.03
ASME B16.9
2½" X 1½"
73
5.16 (STD/40)
48.3
3.68 (STD/40)
89
0.83
ASME B16.9
2½" X 1½"
73
7.01 (XS/80)
48.3
5.08 (XS/80)
89
1.03
ASME B16.9
2½" X 2"
73
5.16 (STD/40)
60.3
3.91 (STD/40)
89
0.83
ASME B16.9
2½" X 2"
73
7.01 (XS/80)
60.3
5.54 (XS/80)
89
1.03
ASME B16.9
3" X 1"
88.9
5.49 (STD/40)
33.4
3.38 (STD/40)
89
1.02
ASME B16.9
3" X 1¼"
88.9
5.49 (STD/40)
42.2
3.56 (STD/40)
89
1.02
ASME B16.9
3" X 1½"
88.9
5.49 (STD/40)
48.3
3.68 (STD/40)
89
1.02
ASME B16.9
3" X 1½"
88.9
7.62 (XS/80)
48.3
5.08 (XS/80)
89
1.42
ASME B16.9
3" X 2"
88.9
5.49 (STD/40)
60.3
3.91 (STD/40)
89
1.02
ASME B16.9
3" X 2"
88.9
7.62 (XS/80)
60.3
5.54 (XS/80)
89
1.42
ASME B16.9
3" X 2½"
88.9
5.49 (STD/40)
73
5.16 (STD/40)
89
1.02
ASME B16.9
3" X 2½"
88.9
7.62 (XS/80)
73
7.01 (XS/80)
89
1.42
ASME B16.9
4" X 1¼"
114.3
6.02 (STD/40)
42.2
3.56 (STD/40)
102
1.71
ASME B16.9
4" X 1¼"
114.3
8.56 (XS/80)
42.2
4.85 (XS/80)
102
2.34
ASME B16.9
4" X 1½"
114.3
6.02 (STD/40)
48.3
3.68 (STD/40)
102
1.71
ASME B16.9
4" X 1½"
114.3
8.56 (XS/80)
48.3
5.08 (XS/80)
102
2.34
ASME B16.9
4" X 2"
114.3
6.02 (STD/40)
60.3
3.91 (STD/40)
102
1.71
ASME B16.9
4" X 2"
114.3
8.56 (XS/80)
60.3
5.54 (XS/80)
102
2.34
ASME B16.9
4" X 2½"
114.3
6.02 (STD/40)
73
5.16 (STD/40)
102
1.71
ASME B16.9
4" X 2½"
114.3
8.56 (XS/80)
73
7.01(XS/80)
102
2.34
ASME B16.9
4" X 3"
114.3
6.02 (STD/40)
88.9
5.49 (STD/40)
102
1.71
ASME B16.9
4" X 3"
114.3
8.56 (XS/80)
88.9
7.62 (XS/80)
102
2.34
ASME B16.9
5" X 2"
141.3
6.55 (STD/40)
60.3
3.91 (STD/40)
127
2.66
ASME B16.9
5" X 2"
141.3
9.53 (XS/80)
60.3
5.54 (XS/80)
127
4.11
ASME B16.9
5" X 2½"
141.3
6.55 (STD/40)
73
5.16 (STD/40)
127
2.66
ASME B16.9
5" X 2½"
141.3
9.53 (XS/80)
73
7.01 (XS/80)
127
4.11
ASME B16.9
5" X 3"
141.3
6.55 (STD/40)
88.9
5.49 (STD/40)
127
2.66
ASME B16.9
5" X 3"
141.3
9.53 (XS/80)
88.9
7.62 (XS/80)
127
4.11
ASME B16.9
5" X 4"
141.3
6.55 (STD/40)
114.3
6.02 (STD/40)
127
2.66
ASME B16.9
5" X 4"
141.3
9.53 (XS/80)
114.3
8.56 (XS/80)
127
4.11
ASME B16.9
6" X 2"
168.3
7.11 (STD/40)
60.3
3.91 (STD/40)
140
3.95
ASME B16.9
6" X 2"
168.3
10.97 (XS/80)
60.3
5.54 (XS/80)
140
5.97
ASME B16.9
6" X 2½"
168.3
7.11 (STD/40)
73
5.16 (STD/40)
140
3.95
ASME B16.9
6" X 2½"
168.3
10.97 (XS/80)
73
7.01 (XS/80)
140
5.97
ASME B16.9
6" X 3"
168.3
7.11 (STD/40)
88.9
5.49 (STD/40)
140
3.95
ASME B16.9
6" X 3"
168.3
10.97 (XS/80)
88.9
7.62 (XS/80)
140
5.97
ASME B16.9
6" X 4"
168.3
7.11 (STD/40)
114.3
6.02 (STD/40)
140
3.95
ASME B16.9
6" X 4"
168.3
10.97 (XS/80)
114.3
8.56 (XS/80)
140
5.97
ASME B16.9
6" X 5"
168.3
7.11 (STD/40)
141.3
6.55 (STD/40)
140
3.95
ASME B16.9
6" X 5"
168.3
10.97 (XS/80)
141.3
9.53 (XS/80)
140
5.97
ASME B16.9
8" X 3"
219.1
6.35 (20)
88.9
5.49 (STD/40)
152
5.03
ASME B16.9
8" X 3"
219.1
7.04 (30)
88.9
5.49 (STD/40)
152
5.64
ASME B16.9
8" X 3"
219.1
8.18(STD/40)
88.9
5.49 (STD/40)
152
56.33
ASME B16.9
8" X 4"
219.1
6.35 (20)
114.3
6.02 (STD/40)
152
5.03
ASME B16.9
8" X 4"
219.1
7.04 (30)
114.3
6.02 (STD/40)
152
5.64
ASME B16.9
8" X 4"
219.1
8.18 (STD/40)
114.3
6.02 (STD/40)
152
6.33
ASME B16.9
8" X 5"
219.1
7.04 (30)
141.3
6.55 (STD/40)
152
5.64
ASME B16.9
8" X 5"
219.1
8.18 (STD/40)
141.3
6.55 (STD/40)
152
6.33
ASME B16.9
8" X 6"
219.1
8.18 (STD/40)
168.3
7.11 (STD/40)
152
6.33
ASME B16.9
10" X 4"
273
6.35 (20)
114.3
6.02 (STD/40)
178
7.38
ASME B16.9
10" X 4"
273
7.8 (30)
114.3
6.02 (STD/40)
178
9.31
ASME B16.9
10" X 4"
273
9.27 (STD/400
114.3
6.02 (STD/40)
178
11.55
ASME B16.9
10" X 5"
273
7.8 (30)
141.3
6.55 (STD/40)
178
9.31
ASME B16.9
10" X 5"
273
9.27 (STD/40)
141.3
6.55 (STD/40)
178
11.55
ASME B16.9
10" X 6"
273
7.8 (30)
168.3
7.11 (STD/40)
178
9.31
ASME B16.9
10" X 6"
273
9.27 (STD/40)
168.3
7.11 (STD/40)
178
11.55
ASME B16.9
10" X 8"
273
6.35 (20)
219.1
6.35 (20)
178
7.38
ASME B16.9
10" X 8"
273
7.8 (30)
219.1
7.04 (30)
178
9.31
ASME B16.9
10" X 8"
273
9.27 (STD/40)
219.1
8.18 (STD/40)
178
11.55

What's new

Subscribe our newsletter to get latest updates

Contact us

NB Fittings manufactures carbon steel welding fittings for pressure piping systems in accordance with EN and ASME standards. Designed for performance. Built for reliability.

Helpful Links

About Us
Products
Certifications
Careers
Contact Us
Privacy Policy
Cookies Policy
Terms and conditions
NB Fittings © 2026 All Rights Reserved.
NB Fittings — Make a Difference
Elbows, caps and reducers built for demanding industrial applications.
Connect with us