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Standard Tube and Pipe Bimetallic (Al/SS) Transition Couplings

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Atlas bimetallic transition couplings are robust, metallurgically-bonded dissimilar metal joints used to weld dissimilar metal tubes or pipes. These high strength joints are reliable and engineered to withstand typical welding temperatures. They are hermetic and suitable for use in Ultra High Vacuum (UHV) and are used in thousands of cryogenic and industrial applications worldwide.

Applications:

Our bimetallic couplings enable the direct coupling of dissimilar metal tubes and pipes with different thermal conductivities (e.g. copper to stainless steel). These fittings are used extensively in cryogenic lines and other thermal transfer applications where contrasting heat transfer is needed. They are also used in nonmagnetic and nuclear applications where the properties of one metal must be reliably switched to that of another.

For robust, demountable hermetic transitions for aluminum, copper or titanium, see our ATCR fittings page and our Bimetallic Atlas CF flange pages.

Bonding Process:

Due to our use of proprietary interlayers in our explosion welding process, our bimetallic joints are fully metallurgically compatible. They are bonded with a low-diffusion method that minimizes porosity and maximizes strength.

Our bimetal tube and pipe transition couplings are available in all standard sizes, wall thicknesses, and schedules ranging from ⅜” to 40″ diameter (DN10 to DN750). Pressure testing and certification up to 400 psi is offered.

Available Materials Combinations:

  • AS (Aluminum 6061/(interlayers: Titanium /Copper)/ 316L Stainless)
  • AT (Aluminum 6061/ Titanium CP Gr2)
  • AC (Aluminum 6061/ C101 Copper)
  • TS (Titanium CP Gr. 2/ 316L Stainless)
  • CS (C101 Copper/ 316L Stainless)

Nearly any combination of metals are available. Ask us for more information!

Weld Configuration:

  • BW (Butt weld prep)
  • SW (Socket weld prep)
  • MW (Male weld prep)

Pipe Schedule Configurations:

  • Schedule 10
  • Schedule 40
  • Schedule 80

Pressure Test Certification:

  • N (not pressure tested or certified)
  • Q (pressure tested and certified to 400 psi)

Specifications Environmental

  • Vacuum Rated to 1 x 10-9 Torr (all bonds are vacuum tested)

Thermal

  • Bakeout Temperature: 300°C
  • Operational Temperature from 4K to 250°C (depending on the metal combination)

Diagrams & Variations

Size Pressure Pipe OD (D) ID (A) Length (C) Bimetal OD (B) Socket Depth Part Number Files Actions
1/8" Not Qualified 0.405 0.307 1.5 0.709 0.02 PTBI-AS-BW0013-10N
Add
1/8" Qualified 0.405 0.307 1.5 0.709 0.02 PTBI-AS-BW0013-10Q
Add
1/4" Qualified 0.54 0.41 1.5 0.914 0.02 PTBI-AS-BW0025-10Q
Add
1/4" Not Qualified 0.54 0.41 1.5 0.914 0.02 PTBI-AS-BW0025-10N
Add
3/8" Qualified 0.675 0.545 1.5 0.983 0.02 PTBI-AS-BW0038-10Q
Add
3/8" Not Qualified 0.675 0.545 1.5 0.983 0.02 PTBI-AS-BW0038-10N
Add
1/2" Qualified 0.84 0.674 1.5 1.172 0.02 PTBI-AS-BW0050-10Q
Add
1/2" Not Qualified 0.84 0.674 1.5 1.172 0.02 PTBI-AS-BW0050-10N
Add
3/4" Qualified 1.05 0.884 1.5 1.358 0.02 PTBI-AS-BW0075-10Q
Add
3/4" Not Qualified 1.05 0.884 1.5 1.358 0.02 PTBI-AS-BW0075-10N
Add
1" Qualified 1.316 1.097 1.5 1.675 0.02 PTBI-AS-BW0100-10Q
Add
1" Not Qualified 1.316 1.097 1.5 1.675 0.02 PTBI-AS-BW0100-10N
Add
1 1/4" Qualified 1.66 1.442 1.5 2.042 0.02 PTBI-AS-BW0125-10Q
Add
1 1/4" Not Qualified 1.66 1.442 1.5 2.042 0.02 PTBI-AS-BW0125-10N
Add
1 1/2" Qualified 1.9 1.682 1.5 2.3 0.02 PTBI-AS-BW0150-10Q
Add
1 1/2" Not Qualified 1.9 1.682 1.5 2.3 0.02 PTBI-AS-BW0150-10N
Add
2" Qualified 2.375 2.157 1.5 2.811 0.02 PTBI-AS-BW0200-10Q
Add
2" Not Qualified 2.375 2.157 1.5 2.811 0.02 PTBI-AS-BW0200-10N
Add
2 1/2" Qualified 2.875 2.635 1.5 3.427 0.02 PTBI-AS-BW0250-10Q
Add
2 1/2" Not Qualified 2.875 2.635 1.5 3.427 0.02 PTBI-AS-BW0250-10N
Add
3" Qualified 3.5 3.26 1.5 4.1 0.02 PTBI-AS-BW0300-10Q
Add
3" Not Qualified 3.5 3.26 1.5 4.1 0.02 PTBI-AS-BW0300-10N
Add
3 1/2" Qualified 4 3.76 1.5 4.636 0.02 PTBI-AS-BW0350-10Q
Add
3 1/2" Not Qualified 4 3.76 1.5 4.636 0.02 PTBI-AS-BW0350-10N
Add
4" Qualified 4.6 4.26 1.5 5.374 0.02 PTBI-AS-BW0400-10Q
Add
4" Not Qualified 4.6 4.26 1.5 5.374 0.02 PTBI-AS-BW0400-10N
Add
5" Qualified 5.563 5.295 1.5 6.31 0.02 PTBI-AS-BW0500-10Q
Add
5" Not Qualified 5.563 5.295 1.5 6.31 0.02 PTBI-AS-BW0500-10N
Add
6" Qualified 6.625 6.357 1.5 7.489 0.02 PTBI-AS-BW0600-10Q
Add
6" Not Qualified 6.625 6.357 1.5 7.489 0.02 PTBI-AS-BW0600-10N
Add
8" Not Qualified 8.625 8.329 1.5 9.625 0.02 PTBI-AS-BW0800-10Q
Add
8" Qualified 8.625 8.329 1.5 9.625 0.02 PTBI-AS-BW0800-10N
Add
10" Qualified 10.75 10.42 1.5 11.75 0.02 PTBI-AS-BW1000-10Q
Add
10" Not Qualified 10.75 10.42 1.5 11.75 0.02 PTBI-AS-BW1000-10N
Add
12" Qualified 12.75 12.39 1.5 13.75 0.02 PTBI-AS-BW1200-10Q
Add
12" Not Qualified 12.75 12.39 1.5 13.75 0.02 PTBI-AS-BW1200-10N
Add
14" Qualified 14 13.624 1.5 15.5 0.02 PTBI-AS-BW1400-10Q
Add
14" Not Qualified 14 13.624 1.5 15.5 0.02 PTBI-AS-BW1400-10N
Add
Size Pressure Pipe OD (D) ID (A) Length (C) Bimetal OD (B) Socket Depth Part Number Files Actions
1/8" Qualified 0.405 0.269 1.5 0.709 0.02 PTBI-AS-BW0013-40Q
Add
1/8" Not Qualified 0.405 0.269 1.5 0.709 0.02 PTBI-AS-BW0013-40N
Add
1/4" Qualified 0.54 0.364 1.5 0.914 0.02 PTBI-AS-BW0025-40Q
Add
1/4" Not Qualified 0.54 0.364 1.5 0.914 0.02 PTBI-AS-BW0025-40N
Add
3/8" Qualified 0.675 0.493 1.5 0.983 0.02 PTBI-AS-BW0038-40Q
Add
3/8" Not Qualified 0.675 0.493 1.5 0.983 0.02 PTBI-AS-BW0038-40N
Add
1/2" Qualified 0.84 0.622 1.5 1.172 0.02 PTBI-AS-BW0050-40Q
Add
1/2" Not Qualified 0.84 0.622 1.5 1.172 0.02 PTBI-AS-BW0050-40N
Add
3/4" Qualified 1.05 0.824 1.5 1.358 0.02 PTBI-AS-BW0075-40Q
Add
3/4" Not Qualified 1.05 0.824 1.5 1.358 0.02 PTBI-AS-BW0075-40N
Add
1" Qualified 1.316 1.049 1.5 1.675 0.02 PTBI-AS-BW0100-40Q
Add
1" Not Qualified 1.316 1.049 1.5 1.675 0.02 PTBI-AS-BW0100-40N
Add
1 1/4" Qualified 1.66 1.38 1.5 2.042 0.02 PTBI-AS-BW0125-40Q
Add
1 1/4" Not Qualified 1.66 1.38 1.5 2.042 0.02 PTBI-AS-BW0125-40N
Add
1 1/2" Qualified 1.9 1.61 1.5 2.3 0.02 PTBI-AS-BW0150-40Q
Add
1 1/2" Not Qualified 1.9 1.61 1.5 2.3 0.02 PTBI-AS-BW0150-40N
Add
2" Qualified 2.375 2.067 1.5 2.811 0.02 PTBI-AS-BW0200-40Q
Add
2" Not Qualified 2.375 2.067 1.5 2.811 0.02 PTBI-AS-BW0200-40N
Add
2 1/2" Qualified 2.875 2.469 1.5 3.427 0.02 PTBI-AS-BW0250-40Q
Add
2 1/2" Not Qualified 2.875 2.469 1.5 3.427 0.02 PTBI-AS-BW0250-40N
Add
3" Qualified 3.5 3.068 1.5 4.1 0.02 PTBI-AS-BW0300-40Q
Add
3" Not Qualified 3.5 3.068 1.5 4.1 0.02 PTBI-AS-BW0300-40N
Add
3 1/2" Qualified 4 3.538 1.5 4.636 0.02 PTBI-AS-BW0350-40Q
Add
3 1/2" Not Qualified 4 3.538 1.5 4.636 0.02 PTBI-AS-BW0350-40N
Add
4" Qualified 4.6 4.026 1.5 5.374 0.02 PTBI-AS-BW0400-40Q
Add
4" Not Qualified 4.6 4.026 1.5 5.374 0.02 PTBI-AS-BW0400-40N
Add
5" Qualified 5.563 5.047 1.5 6.31 0.02 PTBI-AS-BW0500-40Q
Add
5" Not Qualified 5.563 5.047 1.5 6.31 0.02 PTBI-AS-BW0500-40N
Add
6" Qualified 6.625 6.065 1.5 7.489 0.02 PTBI-AS-BW0600-40Q
Add
6" Not Qualified 6.625 6.065 1.5 7.489 0.02 PTBI-AS-BW0600-40N
Add
8" Not Qualified 8.625 7.981 1.5 9.625 0.02 PTBI-AS-BW0800-40Q
Add
8" Not Qualified 8.625 7.981 1.5 9.625 0.02 PTBI-AS-BW0800-40N
Add
10" Qualified 10.75 10.02 1.5 11.75 0.02 PTBI-AS-BW1000-40Q
Add
10" Not Qualified 10.75 10.02 1.5 11.75 0.02 PTBI-AS-BW1000-40N
Add
12" Qualified 12.75 12 1.5 13.75 0.02 PTBI-AS-BW1200-40Q
Add
12" Not Qualified 12.75 12 1.5 13.75 0.02 PTBI-AS-BW1200-40N
Add
14" Qualified 14 13.124 1.5 15.5 0.02 PTBI-AS-BW1400-40Q
Add
14" Not Qualified 14 13.124 1.5 15.5 0.02 PTBI-AS-BW1400-40N
Add
Size Pressure Pipe OD (D) ID (A) Length (C) Bimetal OD (B) Socket Depth Part Number Files Actions
1/8" Qualified 0.405 0.215 1.5 0.709 0.02 PTBI-AS-BW0013-80Q
Add
1/4" Qualified 0.54 0.302 1.5 0.914 0.02 PTBI-AS-BW0025-80Q
Add
1/4" Not Qualified 0.54 0.302 1.5 0.914 0.02 PTBI-AS-BW0025-80N
Add
3/8" Qualified 0.675 0.423 1.5 0.983 0.02 PTBI-AS-BW0038-80Q
Add
3/8" Not Qualified 0.675 0.423 1.5 0.983 0.02 PTBI-AS-BW0038-80N
Add
1/2" Qualified 0.84 0.546 1.5 1.172 0.02 PTBI-AS-BW0050-80Q
Add
1/2" Not Qualified 0.84 0.546 1.5 1.172 0.02 PTBI-AS-BW0050-80N
Add
3/4" Qualified 1.05 0.742 1.5 1.358 0.02 PTBI-AS-BW0075-80Q
Add
3/4" Not Qualified 1.05 0.742 1.5 1.358 0.02 PTBI-AS-BW0075-80N
Add
1" Qualified 1.316 0.957 1.5 1.675 0.02 PTBI-AS-BW0100-80Q
Add
1" Not Qualified 1.316 0.957 1.5 1.675 0.02 PTBI-AS-BW0100-80N
Add
1 1/4" Qualified 1.66 1.278 1.5 2.042 0.02 PTBI-AS-BW0125-80Q
Add
1 1/4" Not Qualified 1.66 1.278 1.5 2.042 0.02 PTBI-AS-BW0125-80N
Add
1 1/2" Qualified 1.9 1.5 1.5 2.3 0.02 PTBI-AS-BW0150-80Q
Add
1 1/2" Not Qualified 1.9 1.5 1.5 2.3 0.02 PTBI-AS-BW0150-80N
Add
2" Qualified 2.375 1.939 1.5 2.811 0.02 PTBI-AS-BW0200-80Q
Add
2" Not Qualified 2.375 1.939 1.5 2.811 0.02 PTBI-AS-BW0200-80N
Add
2 1/2" Qualified 2.875 2.323 1.5 3.427 0.02 PTBI-AS-BW0250-80N
Add
2 1/2" Not Qualified 2.875 2.323 1.5 3.427 0.02 PTBI-AS-BW0250-80Q
Add
3" Qualified 3.5 2.9 1.5 4.1 0.02 PTBI-AS-BW0300-80Q
Add
3" Not Qualified 3.5 2.9 1.5 4.1 0.02 PTBI-AS-BW0300-80N
Add
3 1/2" Qualified 4 3.364 1.5 4.636 0.02 PTBI-AS-BW0350-80Q
Add
3 1/2" Not Qualified 4 3.364 1.5 4.636 0.02 PTBI-AS-BW0350-80N
Add
4" Qualified 4.6 3.826 1.5 5.374 0.02 PTBI-AS-BW0400-80Q
Add
4" Not Qualified 4.6 3.826 1.5 5.374 0.02 PTBI-AS-BW0400-80N
Add
5" Qualified 5.563 4.813 1.5 6.31 0.02 PTBI-AS-BW0500-80Q
Add
5" Not Qualified 5.563 4.813 1.5 6.31 0.02 PTBI-AS-BW0500-80N
Add
6" Qualified 6.625 5.761 1.5 7.489 0.02 PTBI-AS-BW0600-80Q
Add
6" Not Qualified 6.625 5.761 1.5 7.489 0.02 PTBI-AS-BW0600-80N
Add
8" Qualified 8.625 7.625 1.5 9.625 0.02 PTBI-AS-BW0800-80Q
Add
8" Not Qualified 8.625 7.625 1.5 9.625 0.02 PTBI-AS-BW0800-80N
Add
10" Qualified 10.75 9.75 1.5 11.75 0.02 PTBI-AS-BW1000-80Q
Add
10" Not Qualified 10.75 9.75 1.5 11.75 0.02 PTBI-AS-BW1000-80N
Add
12" Qualified 12.75 11.75 1.5 13.75 0.02 PTBI-AS-BW1200-80Q
Add
12" Not Qualified 12.75 11.75 1.5 13.75 0.02 PTBI-AS-BW1200-80N
Add
14" Qualified 14 12.5 1.5 15.5 0.02 PTBI-AS-BW1400-80Q
Add
14" Not Qualified 14 12.5 1.5 15.5 0.02 PTBI-AS-BW1400-80N
Add

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