... :RNS-15,RNS-25,RNS-50,RNS-90.Worm Gear Bevel Gear Screw Jack Configurations:Protective Tube, Rubber Bellows, Electric Motor ... 15KN to 90KN As Standard.* Self Locking Trapezoidal Screw, Spiral Bevel Gears, Max Stroke 6000 mm.* Upright and Inverted mounting.* Top ... model).* Oil Sealing (optional: high/low temperature oil sealing).* Spiral bevel gears: alloy steel,case hardened,be of high rigidity and ...