brake drum 3600AX /A different produing history period

brake drum 3600A/AX is the  selling largest quantity in USA and Canada market along.

It's producing and casting works carfts also three different periods.

First period:raw material grey iron and generally casting works ,dynamic balance testing ways is cutting more weihgt or drill holes.


second period: use the Coated sand casting works,this made the 3600AX drums surface look like fine and exquisite

than the first period ,look like a crafts.


Third period: use alloy metal casting works producing for 3600AX brake drum;

carbon steel and grey iron alloy together keep the drum more strength and tensile than last two periods.