Key features:

High strength, good machinability and corrosion resistance. Suitable for heavy duty gears/bearings with medium to high loads. Good resistance to impact loading.

Full alloy description:

A.W. Fraser Alloy PB2 is a phosphor bronze, commonly referred to as "Gear Bronze", which conforms to the requirements of B.S. 1400 - 1985 alloy PB2.

PB2 has good machining properties, high strength and good corrosion resistance to seawater and brine, making it suitable for pump and valve components.

PB2 is suitable for bearings having medium to high loads and speeds, and has good resistance to impact loading or pounding.

PB2 bearings must have adequate lubrication and good alignment.

PB2 is suitable for heavy duty gears and wormwheels with high working loads and high speeds and adequate lubrication and alignment.

The composition of A.W. Fraser alloy PB2 is strictly controlled as are the casting conditions.

Alloy PB2 products are manufactured using the latest continuous and centrifugal casting technology.
Machinability Rating: 30
SAE Grade: 65*

Comparable specifications:

BS1400 - PB2; AS1565 - 90810; ASTM B427 - C90800 ; ASTM B505 & B271 – C90700 * , SAE 65 *; JIS H5121 – CAC502C (PBC2C) *; DIN 1705 - G - CuSn12; ISO 1338 - CuSn11P

* 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...


  • C90800
  • PB2 / CuSn11P
  • CC483K / CuSn12
  • 2.1052 / CuSn12*
  • CAC502C (PBC2C)*
  • U-E12P
  • UNI 7013-72-2A*
  • C90810*
* = 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 PB2
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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