Stainless Steel Concentric Reducer
S&S Stainless International manufactures high-performance stainless steel concentric reducers engineered to connect pipes of differing diameters along a shared centerline, delivering smooth, uniform fluid flow with minimal pressure drop. Produced in premium 304/304L and 316/316L stainless steel grades to ANSI/ASME B16.9 and MSS SP-43 standards, our cone-shaped reducers offer exceptional structural strength and superior corrosion resistance. Available in both seamless and welded butt-weld configurations across various schedule wall thicknesses, these fittings are ideal for vertical piping systems in chemical processing, oil and gas, water treatment, and hygienic manufacturing facilities worldwide.
What is a concentric reducer?
The stainless steel concentric reducer is a high-quality ASME B16.9 stainless steel pipe fitting designed to connect stainless steel pipes of different diameters in a straight line, ensuring a smooth flow transition. This symmetrical reducer allows for balanced fluid or gas movement, reducing turbulence and maintaining pressure consistency across the stainless steel pipeline. Made from premium stainless steel, our stainless steel concentric reducer offers superior corrosion resistance, strength, and durability, making them ideal for demanding industrial applications.
Our stainless steel concentric reducers are manufactured to meet international standards such as ASTM, JIS, and DIN, ensuring precision and reliability in various industries including oil and gas, chemical processing, and water treatment.
Product Overview of Concentric Reducer
- Specification
- Material Grade 304, 316, 316L
- Nominal Pipe Size 3/4”x1/2” – 48”x40”
- Thickness SCH 5S, SCH 10S, SCH 20S, SCH 40S, SCH 80S, STD, XS
- Product Weight Chart
- The weight chart for the stainless steel concentric reducer can be found in the reference information
- Product Packaging
- Secure and Durable Protection. The export wooden bundle ensures that the stainless steel pipe fittings remain intact and undamaged, even under rough handling and long-distance shipping conditions.
- Carefully Packed and labeled. Each item is meticulously packed in accordance with the packing list to ensure the right quantity and correct product types are included in every shipment.
Product Specification of Concentric Reducer
3/4” – 12”
Nominal
Pipe
Size (inch)
Outside
Diameter (mm)
Thickness (mm)
Length H
(mm)
SCH 5S
SCH 10S
SCH 40S
SCH 80S
1
2
T1
T2
T1
T2
T1
T2
T1
T2
¾’’
½’’
26.7
21.3
1.65
1.65
2.11
2.11
2.87
2.77
3.91
3.73
38.1
1’’
½’’
33.4
21.3
1.65
1.65
2.77
2.11
3.38
2.77
4.55
3.73
50.8
1’’
¾’’
33.4
26.7
1.65
1.65
2.77
2.11
3.38
2.87
4.55
3.91
50.8
1 ¼’’
1’’
42.2
33.4
1.65
1.65
2.77
2.77
3.56
3.38
4.85
4.55
50.8
1 ½’’
½’’
48.3
21.3
1.65
1.65
2.77
2.11
3.68
2.77
5.08
3.73
63.5
1 ½’’
¾’’
48.3
26.7
1.65
1.65
2.77
2.11
3.68
2.87
5.08
3.91
63.5
1 ½’’
1’’
48.3
33.4
1.65
1.65
2.77
2.77
3.68
3.38
5.08
4.55
63.5
1 ½’’
1 ¼’’
48.3
42.2
1.65
1.65
2.77
2.77
3.68
3.56
5.08
4.85
63.5
2’’
¾’’
60.3
26.7
1.65
1.65
2.77
2.11
3.91
2.87
5.54
3.91
76.2
2’’
1’’
60.3
33.4
1.65
1.65
2.77
2.77
3.91
3.38
5.54
4.55
76.2
2’’
1 ¼’’
60.3
42.2
1.65
1.65
2.77
2.77
3.91
3.56
5.54
4.85
76.2
2’’
1 ½’’
60.3
48.3
1.65
1.65
2.77
2.77
3.91
3.68
5.54
5.08
76.2
2 ½’’
1’’
73.0
33.4
2.11
1.65
3.05
2.77
5.16
3.38
7.01
4.55
88.9
2 ½’’
1 ¼’’
73.0
42.2
2.11
1.65
3.05
2.77
5.16
3.56
7.01
4.85
88.9
2 ½’’
1 ½’’
73.0
48.3
2.11
1.65
3.05
2.77
5.16
3.68
7.01
5.08
88.9
2 ½’’
2’’
73.0
60.3
2.11
1.65
3.05
2.77
5.16
3.91
7.01
5.54
88.9
3’’
1’’
88.9
33.4
2.11
1.65
3.05
2.77
5.49
7.62
4.55
88.9
88.9
3’’
1 ¼’’
88.9
42.2
2.11
1.65
3.05
2.77
5.49
7.62
4.85
88.9
88.9
3’’
1 ½’’
88.9
48.3
2.11
1.65
3.05
2.77
5.49
7.62
5.08
88.9
88.9
3’’
2’’
88.9
60.3
2.11
1.65
3.05
2.77
5.49
7.62
5.54
88.9
88.9
3’’
2 ½’’
88.9
73.0
2.11
2.11
3.05
3.05
5.49
7.62
7.01
88.9
88.9
4’’
1 ½’’
114.3
48.3
2.11
1.65
3.05
2.77
6.02
8.56
5.08
101.6
101.6
4’’
2’’
114.3
60.3
2.11
1.65
3.05
2.77
6.02
8.56
5.54
101.6
101.6
4’’
2 ½’’
114.3
73.0
2.11
2.11
3.05
3.05
6.02
8.56
7.01
101.6
101.6
4’’
3’’
114.3
88.9
2.11
2.11
3.05
3.05
6.02
8.56
7.62
101.6
101.6
5’’
3’’
141.3
88.9
2.77
2.11
3.40
3.05
6.55
9.53
7.62
127.0
127.0
5’’
4’’
141.3
114.3
2.77
2.11
3.40
3.05
6.55
9.53
8.56
127.0
127.0
6’’
2 ½’’
168.3
73.0
2.77
2.11
3.40
3.05
7.11
10.97
7.01
139.7
139.7
6’’
3’’
168.3
88.9
2.77
2.11
3.40
3.05
7.11
10.97
7.62
139.7
139.7
6’’
4’’
168.3
114.3
2.77
2.11
3.40
3.05
7.11
10.97
8.56
139.7
139.7
6’’
5’’
168.3
141.3
2.77
2.77
3.40
3.40
7.11
10.97
9.53
139.7
139.7
8’’
4’’
219.1
114.3
2.77
2.11
3.76
3.05
8.18
12.7
8.56
152.4
152.4
8’’
5’’
219.1
141.3
2.77
2.77
3.76
3.40
8.18
12.7
9.53
152.4
152.4
8’’
6’’
219.1
168.3
2.77
2.77
3.76
3.40
8.18
12.7
10.97
152.4
152.4
10’’
5’’
273.1
141.3
2.77
2.77
4.19
3.40
9.27
12.7
9.53
177.8
177.8
10’’
6’’
273.1
168.3
3.40
2.77
4.19
3.40
9.27
12.7
10.97
177.8
177.8
10’’
8’’
273.1
219.1
3.40
2.77
4.19
3.76
9.27
12.7
12.7
177.8
177.8
12’’
6’’
323.9
168.3
3.40
2.77
4.57
3.40
9.53
12.7
10.97
203.2
203.2
12’’
8’’
323.9
219.1
3.96
2.77
4.57
3.76
9.53
12.7
12.7
203.2
203.2
12’’
10’’
323.9
273.1
3.96
3.40
4.57
4.19
9.53
12.7
12.7
203.2
203.2
14” – 48”
Outside Diameter 1
Outside Diameter 2
Thickness(mm)
Length H
(mm)
SCH 10S
SCH 20S
Std
XS
Inch
mm
Inch
mm
T1
T2
T1
T2
T1
T2
T1
T2
14’’
12’’
355.6
323.9
4.78
4.57
7.92
6.35
9.53
9.53
12.7
12.7
330.2
14’’
10’’
355.6
273.1
4.78
4.19
7.92
6.35
9.53
9.27
12.7
12.7
330.2
14’’
8’’
355.6
219.1
4.78
3.76
7.92
6.35
9.53
8.18
12.7
12.7
330.2
14’’
6’’
355.6
168.3
4.78
3.40
7.92
–
9.53
7.11
12.7
10.97
330.2
16’’
14’’
406.4
355.6
4.78
4.78
7.92
7.92
9.53
9.53
12.7
12.7
355.6
16’’
12’’
406.4
323.9
4.78
4.57
7.92
6.35
9.53
9.53
12.7
12.7
355.6
16’’
10’’
406.4
273.1
4.78
4.19
7.92
6.35
9.53
9.27
12.7
12.7
355.6
16’’
8’’
406.4
219.1
4.78
3.76
7.92
6.35
9.53
8.18
12.7
12.7
355.6
18’’
16’’
457.2
406.4
4.78
4.78
7.92
7.92
9.53
9.53
12.7
12.7
381.0
18’’
14’’
457.2
355.6
4.78
4.78
7.92
7.92
9.53
9.53
12.7
12.7
381.0
18’’
12’’
457.2
323.9
4.78
4.57
7.92
6.35
9.53
9.53
12.7
12.7
381.0
18’’
10’’
457.2
273.1
4.78
4.19
7.92
6.35
9.53
9.27
12.7
12.7
381.0
20’’
18’’
508
457.2
5.54
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
20’’
16’’
508
406.4
5.54
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
20’’
14’’
508
355.6
5.54
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
20’’
12’’
508
323.9
5.54
4.57
9.53
6.35
9.53
9.53
12.7
12.7
508.0
22’’
20’’
558.8
508
5.54
5.54
9.53
9.53
9.53
9.53
12.7
12.7
508.0
22’’
18’’
558.8
457.2
5.54
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
22’’
16’’
558.8
406.4
5.54
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
22’’
14’’
558.8
355.6
5.54
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
24’’
22’’
609.6
558.8
6.35
5.54
9.53
9.53
9.53
9.53
12.7
12.7
508.0
24’’
20’’
609.6
508
6.35
5.54
9.53
9.53
9.53
9.53
12.7
12.7
508.0
24’’
18’’
609.6
457.2
6.35
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
24’’
16’’
609.6
406.4
6.35
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
24’’
14’’
609.6
355.6
6.35
4.78
9.53
7.92
9.53
9.53
12.7
12.7
508.0
26’’
24’’
660.4
609.6
12.7
9.53
9.53
9.53
12.7
12.7
609.6
26’’
20’’
660.4
508
12.7
9.53
9.53
9.53
12.7
12.7
609.6
26’’
18’’
660.4
457.2
12.7
7.92
9.53
9.53
12.7
12.7
609.6
26’’
16’’
660.4
406.4
12.7
7.92
9.53
9.53
12.7
12.7
609.6
28’’
26’’
711.2
660.4
12.7
12.7
9.53
9.53
12.7
12.7
609.6
28’’
24’’
711.2
609.6
12.7
9.53
9.53
9.53
12.7
12.7
609.6
28’’
20’’
711.2
508
12.7
9.53
9.53
9.53
12.7
12.7
609.6
28’’
18’’
711.2
457.2
12.7
7.92
9.53
9.53
12.7
12.7
609.6
30’’
28’’
762.0
711.2
12.7
12.7
9.53
9.53
12.7
12.7
609.6
30’’
26’’
762.0
660.4
12.7
12.7
9.53
9.53
12.7
12.7
609.6
30’’
24’’
762.0
609.6
12.7
9.53
9.53
9.53
12.7
12.7
609.6
30’’
20’’
762.0
508
12.7
9.53
9.53
9.53
12.7
12.7
609.6
32’’
30’’
812.8
762.0
12.7
12.7
9.53
9.53
12.7
12.7
609.6
32’’
28’’
812.8
711.2
12.7
12.7
9.53
9.53
12.7
12.7
609.6
32’’
26’’
812.8
660.4
12.7
12.7
9.53
9.53
12.7
12.7
609.6
32’’
24’’
812.8
609.6
12.7
9.53
9.53
9.53
12.7
12.7
609.6
34’’
863.6
32’’
812.8
12.7
12.7
9.53
9.53
12.7
12.7
609.6
34’’
863.6
30’’
762.0
12.7
12.7
9.53
9.53
12.7
12.7
609.6
34’’
863.6
28’’
711.2
12.7
12.7
9.53
9.53
12.7
12.7
609.6
34’’
863.6
26’’
660.4
12.7
12.7
9.53
9.53
12.7
12.7
609.6
36’’
914.4
34’’
863.6
12.7
12.7
9.53
9.53
12.7
12.7
609.6
36’’
914.4
32’’
812.8
12.7
12.7
9.53
9.53
12.7
12.7
609.6
36’’
914.4
30’’
762.0
12.7
12.7
9.53
9.53
12.7
12.7
609.6
36’’
914.4
28’’
711.2
12.7
12.7
9.53
9.53
12.7
12.7
609.6
38’’
965.2
36’’
914.4
9.53
9.53
12.7
12.7
609.6
38’’
965.2
34’’
863.6
9.53
9.53
12.7
12.7
609.6
38’’
965.2
32’’
812.8
9.53
9.53
12.7
12.7
609.6
38’’
965.2
30’’
762.0
9.53
9.53
12.7
12.7
609.6
38’’
965.2
28’’
711.2
9.53
9.53
12.7
12.7
609.6
38’’
965.2
26’’
660.4
9.53
9.53
12.7
12.7
609.6
40’’
1016
38’’
965.2
9.53
9.53
12.7
12.7
609.6
40’’
1016
36’’
914.4
9.53
9.53
12.7
12.7
609.6
40’’
1016
34’’
863.6
9.53
9.53
12.7
12.7
609.6
40’’
1016
32’’
812.8
9.53
9.53
12.7
12.7
609.6
40’’
1016
30’’
762.0
9.53
9.53
12.7
12.7
609.6
42’’
1066.8
40’’
1016
12.7
9.53
9.53
9.53
12.7
12.7
609.6
42’’
1066.8
38’’
965.2
12.7
9.53
9.53
9.53
12.7
12.7
609.6
42’’
1066.8
36’’
914.4
12.7
12.7
9.53
9.53
12.7
12.7
609.6
42’’
1066.8
34’’
863.6
12.7
12.7
9.53
9.53
12.7
12.7
609.6
42’’
1066.8
32’’
812.8
9.53
9.53
12.7
12.7
609.6
42’’
1066.8
30’’
762.0
9.53
9.53
12.7
12.7
609.6
44’’
1117.6
42’’
1066.8
9.53
9.53
12.7
12.7
609.6
44’’
1117.6
40’’
1016
9.53
9.53
12.7
12.7
609.6
44’’
1117.6
38’’
965.2
9.53
9.53
12.7
12.7
609.6
44’’
1117.6
36’’
914.4
9.53
9.53
12.7
12.7
609.6
46’’
1168.4
44’’
1117.6
9.53
9.53
12.7
12.7
711.2
46’’
1168.4
42’’
1066.8
9.53
9.53
12.7
12.7
711.2
46’’
1168.4
40’’
1016
9.53
9.53
12.7
12.7
711.2
46’’
1168.4
38’’
965.2
9.53
9.53
12.7
12.7
711.2
46’’
1168.4
36’’
914.4
9.53
9.53
12.7
12.7
711.2
48’’
1219.2
44’’
1117.6
9.53
9.53
12.7
12.7
711.2
48’’
1219.2
42’’
1066.8
9.53
9.53
12.7
12.7
711.2
48’’
1219.2
40’’
1016
9.53
9.53
12.7
12.7
711.2
FAQs
1. What manufacturing methods do you use for concentric reducers (seamless vs. welded)?
We manufacture seamless concentric reducers using rotary swaging or die-pressing on seamless stainless steel pipe for high-pressure applications. For larger industrial diameters, we utilize welded construction formed from stainless steel plate with 100% full-penetration longitudinal welds, inspected to ensure complete structural integrity.
2. What quality control tests are conducted to verify wall thickness, taper uniformity, and material grade?
Every production batch undergoes 100% Positive Material Identification (PMI) chemical verification and ultrasonic wall thickness measurements along the sloped reduction zone to confirm compliance with ASME B16.9 tolerances. We also perform solution annealing heat treatment to eliminate internal stress and restore full corrosion resistance. All orders are supplied with EN 10204 3.1 Material Test Reports (MTRs) and support Third-Party Inspection (TPI) by SGS, BV, or TÜV.
3. What are your standard production lead times and minimum order quantities (MOQ)?
Our standard factory production lead time is 30 to 45 days upon order confirmation and technical drawing approval. We offer flexible MOQs for standard sizes (such as 304/304L and 316/316L in Schedules 10S and 40S), allowing international buyers to mix different reducer sizes and schedule wall thicknesses in a single order to optimize container loading.
4. How are concentric reducers packaged for export to protect bevel ends during long-distance shipping?
All bevel ends are protected with plastic caps to prevent edge chipping or deformation. Small-to-medium concentric reducers are packed inside ISPM-15 heat-treated, seaworthy wooden cases lined with plastic moisture barriers. Large-diameter reducers are steel-strapped into heavy-duty wooden bundles or onto pallets with protective inter-layer cushioning to prevent metal-to-metal impact during ocean freight.
5. What delivery terms and shipping options do you support for international destinations?
We support a wide range of international commercial trade terms, including EXW, FOB (Taiwan/China ports), CFR, CIF, and DDP. Cargo can be dispatched via Full Container Load (FCL) or Less than Container Load (LCL) ocean freight. For urgent project timelines or plant shutdowns, expedited air freight options are also available.
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