SAE 64 Bronze

C93700 SAE 64 is a Leaded Tin Bronze. It is sometimes referred to as 80-10-10 Bronze. This references the chemical composition of 80 % Copper, 10 % Tin, and 10% Lead. C937 utilizes the Tin to add strength to the alloy.  The addition of lead acts as a natural lubricant and increases the machinability of bronze alloys.  Lead also allows dirt particles to become embedded in the bearing surface, thereby protecting the journal.