... is a new machanical transmission fastener, which is often used in the whole world. Its material is superior gray ... , 1215, 1310, 1610, 1615, 2012, 2517, 2525, 3020, 3030, 3535, 4040, 4545, 5050, 6050, 7060, 8060, 10085, 120100. 2.QD ... F, J, M, N, P, W, S. 3.Material Used: Cast Iron, We are the manufacturer of sprockets and machinery ... high quality and good prices.Spot goods Taper bushes 3535-75