Views: 2 Author: Monica Publish Time: 2026-01-07 Origin: Site
In industrial piping systems, connecting pipes of different diameters is a common necessity. While butt-weld reducers are standard for large pipelines, Swage Nipples are the solution for smaller bore sizes and high-pressure applications.
This guide breaks down the types, end connections, and size specifications of Swage Nipples to help you make informed procurement decisions.
Swage nipples, also known as swage reducers or pipe reducers, are forged fittings that connect two pipes of different diameters. It facilitates a reduction in line diameter within a very compact space. They are typically butt-welded or socket-welded into the system, offering a robust, leak-proof connection ideal for high-pressure services in oil & gas, chemical, petrochemical, and power generation industries.
Just like standard reducers, Swage Nipples are categorized based on their shape and alignment.
Concentric Swage Nipple
Shape: Symmetrical, resembling a cone.
Function: Reduces the diameter uniformly. The center of the inlet aligns perfectly with the center of the outlet.
Best Use: Vertical pipelines. This symmetry allows for smooth fluid flow and prevents turbulence.
Eccentric Swage Nipple
Shape: Asymmetrical; one side is flat while the other is tapered.
Function: The center of the smaller end is offset from the larger end.
Best Use: Horizontal pipelines. The flat side is usually installed facing down (bottom-flat) to prevent fluid trapping or facing up (top-flat) to prevent air pockets.
ASME B16.11 Concentric Swaged Nipple
Nominal size | OD at end | Length ofsmall end | End to end | |
DN | NPS | OD1×0D2 | SL min | A |
8×6 | 1/4×1/8 | 13.7×10.3 | 20 | 57 |
10×6 | 3/8×1/8 | 17.1×10.3 | 20 | 64 |
10×8 | 3/8×1/4 | 17.1×13.7 | 20 | |
15×6 | 1/2×1/8 | 21.3×10.3 | 20 | 70 |
15×8 | 1/2×1/4 | 21.3×13.7 | 20 | |
15×10 | 1/2×3/8 | 21.3×17.1 | 20 | |
20×6 | 3/4×1/8 | 26.7×10.3 | 20 | 76 |
20×8 | 3/4×1/4 | 26.7×13.7 | 20 | |
20×10 | 3/4×3/8 | 26.7×17.1 | 22 | |
20×15 | 3/4×1/2 | 26.7×21.3 | 22 | |
25×6 | 1×1/8 | 33.4×10.3 | 20 | 89 |
25×8 | 1×1/4 | 33.4×13.7 | 20 | |
25×10 | 1×3/8 | 33.4×17.1 | 22 | |
25×15 | 1×1/2 | 33.4×21.3 | 22 | |
25×20 | 1×3/4 | 33.4×26.7 | 22 | |
32×6 | 11/4×1/8 | 42.2×10.3 | 20 | 102 |
32×8 | 11/4×1/4 | 42.2×13.7 | 20 | |
32×10 | 11/4×3/8 | 42.2×17.1 | 22 | |
32×15 | 11/4×1/2 | 42.2×21.3 | 22 | |
32×20 | 11/4×3/4 | 42.2×26.7 | 25 | |
32×25 | 11/4×1 | 42.2×33.4 | 25 | |
40×6 | 11/2×1/8 | 48.3×10.3 | 20 | 114 |
40×8 | 11/2×1/4 | 48.3×13.7 | 20 | |
40×10 | 11/2×3/8 | 48.3×17.1 | 22 | |
40×15 | 11/2×1/2 | 48.3×21.3 | 25 | |
40×20 | 11/2×3/4 | 48.3×26.7 | 25 | |
40×25 | 11/2×1 | 48.3×33.4 | 25 | |
40×32 | 11/2×11/4 | 48.3×42.2 | 25 | |
50×6 | 2×1/8 | 60.3×10.3 | 20 | 165 |
50×8 | 2×1/4 | 60.3×13.7 | 22 | |
50×10 | 2×3/8 | 60.3×17.1 | 22 | |
50×15 | 2×1/2 | 60.3×21.3 | 25 | |
50×20 | 2×3/4 | 60.3×26.7 | 30 | |
50×25 | 2×1 | 60.3×33.4 | 30 | |
50×32 | 2×11/4 | 60.3×42.2 | 30 | |
50×40 | 2×11/2 | 60.3×48.3 | 30 | |
100×40 | 4×11/2 | 114.3×48.3 | 40 | 229 |
100×50 | 4×2 | 114.3×60.3 | 45 | |
100×65 | 4×21/2 | 114.3×73.0 | 45 | |
100×80 | 4×3 | 114.3×88.9 | 45 | |
100×90 | 4×31/2 | 114.3×101.6 | 45 | |
125×8 | 5×1/4 | 141.3×13.7 | 25 | 279 |
125×10 | 5×3/8 | 141.3×17.1 | 25 | |
125×15 | 5×1/2 | 141.3×21.3 | 25 | |
125×20 | 5×3/4 | 141.3×26.7 | 30 | |
125×25 | 5×1 | 141.3×33.4 | 30 | |
125×32 | 5×11/4 | 141.3×42.2 | 40 | |
125×40 | 5×11/2 | 141.3×48.3 | 40 | |
125×50 | 5×2 | 141.3×60.3 | 45 | |
125×65 | 5×21/2 | 141.3×73.0 | 45 | |
125×80 | 5×3 | 141.3×88.9 | 45 | |
125×90 | 5×31/2 | 141.3×101.6 | 45 | |
125×100 | 5×4 | 141.3×114.3 | 50 | |
150×15 | 6×1/2 | 168.3×21.3 | 30 | 304 |
150×20 | 6×3/4 | 168.3×26.7 | 30 | |
150×25 | 6×1 | 168.3×33.4 | 40 | |
150×32 | 6×11/4 | 168.3×42.2 | 40 | |
150×40 | 6×11/2 | 168.3×48.3 | 45 | |
150×50 | 6×2 | 168.3×60.3 | 45 | |
150×65 | 6×21/2 | 168.3×73.0 | 45 | |
150×80 | 6×3 | 168.3×88.9 | 45 | |
150×90 | 6×31/2 | 168.3×101.6 | 50 | |
150×100 | 6×4 | 168.3×114.3 | 50 | |
150×125 | 6×5 | 168.3×141.3 | 60 | |
Note:
When ordering according to SH/T3419 standard, the outer diameter should be the one specified in SH/T3405 "Series of Outer Diameters for Steel Pipes in Petrochemical Enterprises".
ASME B16.11 Eccentric Swaged Nipple
Nominal size | OD at end | Length of small end | End to end | |
DN | NPS | OD1×0D2 | SL min | A |
65×6 | 21/2×1/8 | 73.0×10.3 | 22 | 178 |
65×8 | 21/2×1/4 | 73.0×13.7 | 22 | |
65×10 | 21/2×3/8 | 73.0×17.1 | 22 | |
65×15 | 21/2×1/2 | 73.0×21.3 | 25 | |
65×20 | 21/2×3/4 | 73.0×26.7 | 25 | |
65×25 | 21/2×1 | 73.0×33.4 | 30 | |
65×32 | 21/2×11/4 | 73.0×42.2 | 30 | |
65×40 | 21/2×11/2 | 73.0×48.3 | 40 | |
65×50 | 21/2×2 | 73.0×60.3 | 40 | |
80×6 | 3×1/8 | 88.9×10.3 | 22 | 203 |
80×8 | 3×1/4 | 88.9×13.7 | 22 | |
80×10 | 3×3/8 | 88.9×17.1 | 22 | |
80×15 | 3×1/2 | 88.9×21.3 | 25 | |
80×20 | 3×3/4 | 88.9×26.7 | 25 | |
80×25 | 3×1 | 88.9×33.4 | 30 | |
80×32 | 3×11/4 | 88.9×42.2 | 30 | |
80×40 | 3×11/2 | 88.9×48.3 | 40 | |
80×50 | 3×2 | 88.9×60.3 | 40 | |
80×65 | 3×21/2 | 88.9×73.0 | 40 | |
90×6 | 31/2×1/8 | 101.6×10.3 | 22 | 203 |
90×8 | 31/2×1/4 | 101.6×13.7 | 22 | |
90×10 | 31/2×3/8 | 101.6×17.1 | 22 | |
90×15 | 31/2×1/2 | 101.6×21.3 | 25 | |
90×20 | 31/2×3/4 | 101.6×26.7 | 25 | |
90×25 | 31/2×1 | 101.6×33.4 | 30 | |
90×32 | 31/2×11/4 | 101.6×42.2 | 30 | |
90×40 | 31/2×11/2 | 101.6×48.3 | 40 | |
90×50 | 31/2×2 | 101.6×60.3 | 40 | |
90×65 | 31/2×21/2 | 101.6×73.0 | 40 | |
90×80 | 31/2×3 | 101.6×88.9 | 40 | |
100×8 | 4×1/4 | 114.3×13.7 | 25 | 229 |
100×10 | 4×3/8 | 114.3×17.1 | 25 | |
100×15 | 4×1/2 | 114.3×21.3 | 25 | |
100×20 | 4×3/4 | 114.3×26.7 | 30 | |
100×25 | 4×1 | 114.3×33.4 | 30 | |
100×32 | 4×11/4 | 114.3×42.2 | 40 | |
200×25 | 8×1 | 219.1×33.4 | 40 | 330 |
200×32 | 8×11/4 | 219.1×42.2 | 40 | |
200×40 | 8×11/2 | 219.1×48.3 | 45 | |
200×50 | 8×2 | 219.1×60.3 | 45 | |
200×65 | 8×21/2 | 219.1×73.0 | 45 | |
200×80 | 8×3 | 219.1×88.9 | 50 | |
200×90 | 8×31/2 | 219.1×101.6 | 50 | |
200×100 | 8×4 | 219.1×114.3 | 50 | |
200×125 | 8×5 | 219.1×141.3 | 60 | |
200×150 | 8×6 | 219.1×168.3 | 60 | |
250×50 | 10×2 | 273.0×60.3 | 45 | 381 |
250×65 | 10×21/2 | 273.0×73.0 | 45 | |
250×80 | 10×3 | 273.0×88.9 | 50 | |
250×90 | 10×31/2 | 273.0×101.6 | 50 | |
250×100 | 10×4 | 273.0×114.3 | 60 | |
250×125 | 10×5 | 273.0×141.3 | 60 | |
250×150 | 10×6 | 273.0×168.3 | 65 | |
250×200 | 10×8 | 273.0×219.1 | 65 | |
300×50 | 12×2 | 323.8×60.3 | 50 | 406 |
300×65 | 12×21/2 | 323.8×73.0 | 50 | |
300×80 | 12×3 | 323.8×88.9 | 60 | |
300×90 | 12×31/2 | 323.8×101.6 | 60 | |
300×100 | 12×4 | 323.8×114.3 | 65 | |
300×125 | 12×5 | 323.8×141.3 | 65 | |
300×150 | 12×6 | 323.8×168.3 | 65 | |
300×200 | 12×8 | 323.8×219.1 | 70 | |
300×250 | 12×10 | 323.8×273.0 | 70 | |
Note:
If ordering per SH/T 3419, the outside diameter specified in SH/T 3405, "tube outside diameter in the petrochemical industry," shall be applied.
For precise dimensional data, pressure ratings, or material certifications, always consult the manufacturer's catalog or technical datasheet specific to the product.
