... products. 2.International Approval: ISO9001 3.Alloy steel ,with heat treatment. Lumber conveyor chain with kinds of sizes up to your order .Our ... in 1994. It's the branch of Zhejiang Angxing Chain Limited Company.It covers around 10,000 square meters.Passed ... It's strictly produced by ISO/ANSI/DIN standard. Silent chain,leaf chain,roller chain,special chain,sprocket,couplingare also our main products.