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Farmers Copper maintains a large inventory of C46400 Naval Brass bar that can be manufactured to the ASTM B21 standard. Our C46400 brass alloy displays a great capacity for being hot worked and can also be cold worked moderately. Alloy 464 consists of 60% copper, 39.2% zinc, and 08% tin and due to its excellent resistance to seawater, it makes for the perfect alloy for salt and freshwater immersion.

According to ASTM International, this specification establishes the requirements for rods, bars, and shapes of naval brass with Copper Alloy UNS Nos. C46200, C46400, C47940, C48200, and C48500. Tempers available under this specification are M30 (as-hot extruded), O60 (soft annealed), O50 (light annealed), H60 (cold headed and formed), H02 (½ hard), and H04 (hard). Products shall be tested and shall adhere to dimensional (diameter, shape, length, straightness, and edge contour), mechanical (tensile and yield strength, Rockwell hardness, and elongation), and chemical composition requirements. Products shall also meet piston-finish rod and shafting, and U.S. Government purchase requirements. ("Standard Specification for Naval Brass Rod, Bar, and Shapes", 2019)1

Applications of ASTM B21 Naval Brass

Farmers Copper’s ASTM B21 C46400 naval brass is used in multiple industries such as marine, industrial, plumbing and more. This type of brass alloy is typically used for propeller shafts, fasteners, bushings, valve stems, and more applications.

1ASTM B21 / B21M-18(2019), Standard Specification for Naval Brass Rod, Bar, and Shapes, ASTM International, West Conshohocken, PA, 2019,

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