... be in different colour. Pillow block housing T series:Material: HT250 GRAY CAST IRON - TENSILE STRENGTH 250MPa.Chemical composition(%) of ht250 ... gray cast iron:(2.6~3.6) %C,(1.2~3.0) %Si ... PP, FA, FB, HA, PF, PFT, PX, PH).Material: Cast iron HT250, Stainless 304, press steel tape.Boundary dimensions(mm)Bearing ... 1443349T2088519168349298series