COLPHOS 90 ® Free cutting PB.

This alloy has a superb machinability rating closely approaching that of free cutting brass. The mechanical properties are similar to that of PB102 but with the added lead content, the alloy not only offers outstanding machinability but significant self lubrication, self seating, alignment and anti seizure properties in bearing applications. 

COLPHOS 90 is recommended for consideration in many applications where a conventional non-leaded bronze would be used. 
Typical uses include thrust washers, bearing bushes, cams, clutch plates, intricate machined fasteners and components, gears, and pump and valve spindles.

Bronze SAE660         Colphos 90
Cu  83%                    Cu Remainder
Pb  7%                      Pb 3.5-4.5%
Sn  7%                      Sn  3.5-4.5%
Zn  3%                      Zn  1.5-4.5%