Aluminum Brazing Fin and Sheet

1100, 1145, and 3003 Fin

These alloys are manufactured into various serpentine fin formations for use in heat transfer applications. The basic function of the aluminum fin is to efficiently transfer heat.

Common alloy fin stock, which includes 1100, 1145, and 3003, is utilized in charge air coolers, evaporators, condensers, radiators, humidifiers, and baseboard heaters. Over the past 10-15 years, aluminum fin has replaced copper in many applications due to its light weight, increased conductivity, and corrosion resistance. At Lynch Metals, our major markets are aerospace and automotive, and these aluminum alloys are utilized in those applications.

Our precision slitting equipment was engineered to slit as light as .001” at speeds up to 1600 feet per minute. We hold very tight width tolerances with tight, ribbon wound coils with no burr.

#7, 8, 13 and 14 Brazing Sheet

Stock Sizes for No. 8 Vacuum Brazing Alloys Readily Available for 1 Week Delivery:
No .8 .005” to .125”*Other gauges available upon request

Number 8 brazing sheet is typically used in vacuum brazing applications. It’s a two-sided clad product with a 3003 core and a 4004 cladding, and is the dominant product utilized when vacuum brazing is performed inside a vacuum chamber vessel. Temperature is uniformly maintained on the part when heating in a vacuum, which greatly reduces residual stresses due to slow heating and cooling cycles. This process can significantly improve the mechanical and thermal properties of the material, thus providing unique heat treat capabilities. No. 7 has one side clad and No.8 has two sides clad. No. 13 and No. 14 brazing sheet is also used in vacuum brazing applications. Both have a heat treatable core alloy of 6951 and a clad alloy of 4004. Due to the added strength of the 6951 core alloy, this product is utilized in aerospace applications predominantly. No. 13 has one side clad and No.14 has two sides clad.

Brazing Sheet Items No. of Sides Clad Core Alloy Cladding Alloy Nominal Cladding Thickness Per Side (Percent of Composite Thickness) Optimum Brazing Range (°F) Optimum Brazing Range (°C)
No. 7 1 3003 4004 15% for .024” and less
10% for .025”-.062”
7.5% for .063” and more
1090 – 1120 588 – 604
No. 8 2 3003 4004 15% for .024” and less
10% for .025”-.062”
7.5% for .063” and more
1090 – 1120 588 – 604
No. 13 1 6951 4004 15% for .024” and less
10% for .025”-.062”
7.5% for .063” and more
1080 – 1110 582 – 599
No. 14 2 6951 4004 15% for .024” and less
10% for .025”-.062”
7.5% for .063” and more
1080 – 1110 582 – 599

*Other gauges available upon request