Casing and bell housing in drawn or cast aluminium alloy (except for QB 350 in cast iron)
GLEASON spiral bevel gear in Nickel Chrome steel with Case hardening treatment
Carbon steel shafts available in different constructive forms: solid version with key, hollow version with keyway, hollow version with UNI 8953 groove and hollow version prepared for shrink disc
Tapered roller bearings (except QB54 which has radial ballbearings)
NBR type A sealing rings on the shafts and NBR O-rings for closing the bell housings
Lubrication with synthetic oil ISO 150 except QB54 size provided with permanent 00 EP mineral grease