At SCOTTFRIO, we understand your needs, value your expectations, and deliver reliable HVACR copper solutions backed by professional expertise and manufacturing know-how.
The most used brass grades for Air Conditioning and Refrigeration (ACR) are primarily selected based on how the component is manufactured (machining vs. forging) and the specific environmental requirements (corrosion resistance).
In the ACR industry, the following grades are the standard:
Raw brass bars in SCOTTFRIO factory
UNS C36000 (Free-Machining Brass)
This is the "standard" brass for high-volume, precision-machined ACR components.
· Common Use: Valve bodies, flare nuts, adapters, stems, and small internal components.
· Key Advantage: It has a machinability rating of 100%, allowing for fast production with excellent surface finishes.
· Note: Its high lead content (3%) makes it brittle for cold-working (bending or flaring), so it is used almost exclusively for parts made on CNC or screw machines.
SCOTTFRIO brass fittings
UNS C37700 (Forging Brass)
When an ACR part needs to be complex in shape and structurally dense, C37700 is the go-to grade.
· Common Use: Large valve bodies (like ball valves), manifold blocks, and heavy-duty fittings.
· Key Advantage: It has excellent "hot flow" characteristics, meaning it can be forged into intricate shapes without cracking.
· Note: It is roughly 80% as machinable as C36000 but offers much better pressure tightness due to the forged grain structure.
SCOTTFRIO ACR ball valves
EN 12164 / CW617N & CW614N (European Standards)
If you are sourcing or exporting to Europe, you will encounter these equivalents:
· CW617N: Equivalent to C37700; the standard for hot forging.
· CW614N: Equivalent to C36000; the standard for high-speed machining.
Special Application Grades
· DZR Brass (Dezincification Resistant): Often designated as C35330 or CW602N. Used in systems where the water or refrigerant environment is aggressive and might leach zinc out of standard brass, leading to "pinhole" leaks.
· C46400 (Naval Brass): Used for ACR equipment installed in marine or highly corrosive coastal environments due to its high resistance to saltwater.
· Lead-Free Alloys: With increasing regulations, alloys like C69300 (Silicon Brass) are becoming more common for components that must comply with environmental standards while maintaining high pressure ratings.
Selection Summary Table
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