Copper and Copper Alloys - SAE 660/ C93200

SAE 660/ C93200

Leaded bronze is easily malleable and provides long life service due to its strong resistance to corrosion and abrasion. SAE 660 is one of the continuously cast semi finished products providing benefits which include: Completely sound castings that are free from pores, shrinkage, cavities, blowholes and segregation, smooth clean surfaces with close dimensional tolerances, good machinability and no hard casting skin. Its resistance to brine and seawater make it a suitable material for pump and valve components.

Leaded bronzes and gunmetals offer better machining characteristics than that of the other bronzes whilst maintaining a good balance of corrosion resistance and strength.

Chemical Composition


Chemical Element % Present
Chromium (Cr) 0.0 - 0.10
Lead (Pb) 6.00 - 7.50
Zinc (Zn) 4.00 - 6.00
Nickel (Ni) 0.0 - 0.10
Phosphorous (P) 0.0 - 0.15
Tin (Sn) 6.30 - 7.50
Copper (Cu) Balance


Physical PropertyValue
Density 8.91 g/cm³
Melting Point 584 °C
Thermal Expansion 18 x10^-6 /K
Thermal Conductivity 58.2 W/m.K
Electrical Resistivity 14.2 x10^-6 Ω .m



Mechanical PropertyValue
Elongation A50 mm 10 %
Hardness Brinell 65 HB
Tensile Strength 240 N/mm2
0.2% Proof Stress 138 N/mm2

Alloy Designations

ASTM B 505

ASTM B 271

Supplied Forms

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Last Datasheet Revision

22 July 2016


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.