... & sales a new Europe-type RNF-Series Cubic Gearboxes Self lock jacks, small&compact appearance, installation sizes is the ... mounting position.Ball screw with large pitches are consequently not self-locking. Suitable brakes or braking motors must therefore be ... bevel gearboxes,hand wheel,electric motor,travel nut,protetive tube,rubber bellows,limited switches,couplings,linking shaft,trunnion base etc. ...