Key features:

Exceptional strength, good wearing properties and good ductibility but has only fair machinability.

Full alloy description:

A.W. Fraser Alloy 863 is a high strength manganese bronze or high tensile brass conforming to the requirements of UNS C86300.

Alloy 863 has exceptional strength, good wearing pr operties and good ductility, but has poor machinability. It is suitable for extra heavy duty slow speed bearings with good lubrication and for hydraulic cylinder components.

Alloy 863 has reasonable corrosion resistance but may be susceptible to dezincification under certain conditions.

The composition of A.W. Fraser alloy 863 is strictly controlled as are the casting conditions. Alloy 863 products are manufactured using the latest continuous and centrifugal casting technology.
Machinability Rating: 25
SAE Grade: 430B

Comparable specifications:

BS1400 - HTB3 * ; AS1565 C86300; ASTM B505, B271 - C86300; SA E 430 * ; JIS H5121 – CAC304C (HBsC4) * ; DIN 1709 CuZn25Al5*

* Similar but not identical

Download tech sheet:

For a full alloy summary, including Chemical Composition and Mechanical Properties, please download our tech sheet in PDF format below...


  • C86300
  • HTB3* / CuZn28Al5FeMn
  • CC762S / CuZn25Al5Mn4Fe3
  • 2.0598 / CuZn25Al5*
  • CAC304 (HBsC4)
  • C86300
* = similar specification


The alloy information provided on this page is indicative and must not be taken as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product specification.

The information contained on this page is based on our present knowledge and is given in good faith as a precursor to discussing your specific requirements with us.

No liability will be accepted by AW Fraser in respect of any action taken by any third party in relying on the data on this page.
Enquire about Alloy 863
AW Fraser has the capability to modify alloys for improved performance.

To discuss your specific requirements, please contact our technical team on the telephone number below, or e-mail us via the enquiry form:
  • +64 3 341 0027
Alloy enquiry form
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Reasons to choose AW Fraser:

  • AW Fraser exports to all corners of the globe, maintaining a competitive edge in the global marketplace through a commitment to quality engineering and manufacturing.
  • AW Fraser maintains its own laboratory with the latest equipment and can supply reports for all production on request. Read more
  • AW Fraser is accredited to ISO 9001 and ISO 14001, delivering independently accredited quality. Read more
  • AW Fraser has received multiple Supplier Awards from a Fortune 500 company for machined components.

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