2-Bolt Flange Bearing: 50 mm Bore Dia., Set Screw, Cast Iron, 52100 Chrome Steel This listing is for each. Bolt Size 18mm Height 190mm Housing Material Cast Iron Lock Type Set Screw Seal Material Buna-N Shaft Diameter 50mm Style 2-Bolt Type Flanged Bearing Width 116mm Product Weight 5.566 Catalog Page BBV11, Page 14-13 Notes Cast iron mounted unit housings are single-piece units with high load carrying capacity INA housed units with radial insert ball bearings have a patented anti-corrosion coating on the inner ring which are an economical alternative to bearings made from stainless steel, without the associated disadvantages such as reduced load carrying capacity. What benefits does Corrotect offer? Bearings remain corrosion-protected for a considerable length of time Considerable extension of operating life for housing units Inner rings and locking collars are protected against fretting corrosion as standard Prevents corrosion creep on the seal contact