Alloy Grade UNS: C90700 – Copper-Tin Alloy’s 

  • Overview

    C90700 is a copper-tin alloy that is up to 88.8% copper. This copper-tin alloy popularity as a gear material is earned because of its high tensile, yield, and compression strength, as well as good wear resistance. Many gear materials are variations of this alloy with modest changes in nickel and/or tin content.

  • Typical Uses

    Bearings and gears.

  • MetalTek Grade

    MTEK 65

Similar Specifications

Cast UNS: C90700

Cast Grade: C90700

Cast ASTM: B427, B505

Military/AMS: QQ-C-390B

Other Specifications: SAE 65

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: n/a

Chromium: n/a

Manganese: n/a

Iron: n/a

Copper: 88.8

Nickel: n/a

Lead: n/a

Tin: 11

Silicon: n/a

Zinc: n/a

Other: P 0.2

Minimum Mechanical Properties

Tensile, ksi


Tensile, MPa


Yield, ksi


Yield, MPa