The tubes made of C27400 brass are alloys of copper and zinc that are used for fabrication where there is need for good cold working capability. The alloys have about 62.5% copper and 37.5% zinc. This UNS type of brass tube is covered by ASTM B135 specifications on seamless brass tubing. Formability of the brass alloy allows it to be used for cold heading, end pressing, flaring and tubular riveting during manufacture of components. The tubes are supplied with different treatment for strength and fabrication such as draw or annealed.C27400 is a low-lead brass (0.09% max in CDA data). This is lower than the US 0.25% definition of lead free (weighted-average) but potable-water use requires NSF/ANSI 61 and 372 certification of the finished product. USA Pipings offers C27400 brass tubes which are backed by material traceability and EN 10204 3.1 Mill Test Certificates.
Specifications of C27400 63/37 Lead Free Brass Tubes
| Parameter | Specification Details (UNS C27400 Tube Basis) |
|---|---|
| UNS Alloy Designation | UNS C27400 |
| Common Trade Name | 63/37 Yellow Brass; Cold Heading Brass |
| Governing Standard | ASTM B135 (Standard Specification for Seamless Brass Tube) |
| Manufacturing Form | Seamless Round Tube |
| Available Tempers |
Drawn: H55 (Light Drawn), H80 (Hard Drawn) Annealed: O50 (Light Anneal), O60 (Soft Anneal) |
| Nearest European Equivalent | Nearest match: EN CuZn37 / CW508L |
| Testing & Quality Assurance | Tensile, Rockwell Hardness, Expansion (Pin Test), Eddy Current / Hydrostatic NDT |
| Mill Certification | EN 10204 3.1 Mill Test Certificate provided with heat tracking |
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Applications and Industrial Uses of C27400 63/37 Lead Free Brass Tubes
- Brass Cartridge Cases
- Cold-Formed Brass Bushings
- Brass Compression Fittings
- Flared Tube Connectors
- Brass Hose Fittings
- Brass Electrical Terminals
- Brass Tubular Spacers
- Brass Rivet Sleeves
Frequently Asked Questions
What is C27400 brass?
UNS C27400 is a specialized 63/37 yellow brass alloy containing 61.0% to 64.0% copper, balance zinc, with strictly controlled iron and low residual lead. It is engineered specifically for severe cold heading, end pressing, bending, and forging applications.
What is the difference between C27400 and C27200?
While both are 63/37 yellow brasses, UNS C27400 specifies a copper range of 61.0% to 64.0% (nominal 62.5% Cu), whereas UNS C27200 specifies a higher copper range of 62.0% to 65.0% (nominal 63.5% Cu). C27400 and C27200 are both 63/37 brasses; choose by the grade your drawing or customer specification names.
Is C27400 lead free?
ASTM B135 limits lead (Pb) in UNS C27400 to a low residual limit (0.09% max). While well below the 0.25% weighted average threshold defined by the US Safe Drinking Water Act (SDWA), raw C27400 tube is supplied as low-lead feed stock; potable water compliance requires NSF/ANSI 61 and 372 testing on the final finished assembly.
Which ASTM standard covers C27400 tube?
UNS C27400 seamless brass tubing is manufactured, tested, and certified in accordance with ASTM B135 (Standard Specification for Seamless Brass Tube).
What tempers are available for C27400 brass tubes?
C27400 seamless tube is available in drawn tempers H55 (Light Drawn) and H80 (Hard Drawn), as well as annealed tempers O50 (Light Anneal) and O60 (Soft Anneal).
Is C27400 good for cold heading and forging?
Yes. C27400 exhibits excellent cold-working capacity, making it an outstanding alloy choice for cold heading, end pressing, flaring, riveting, and bending operations without surface cracking.
Is C27400 suitable for seawater?
No. UNS C27400 is an uninhibited yellow brass alloy susceptible to dezincification in marine, brackish, or stagnant high-chloride environments. Specify C44300 Admiralty Brass or C70600 Copper Nickel for seawater duty.
ASTM B135 compliance. EN 10204 3.1 Mill Test Certificates with heat tracking.
Send your specification to USA Piping Solution for a same-day quote with confirmed lead times.
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