... % Si:0.01% Rem:Copper Mechanical properties :This COPPER ALLOY BC-7 has a good grinding of cutting performance and welding, heat processing to ... the main frame, gears, bushings, bush, take over the mouth and flange, rocker arm, guided valve, pump rod, cam, a fixed ... nut of high structural strength and wear-resistant parts Gunmetal JIS BC-7 copper alloy casting Bronze Rod ...