single lead screws bevel gear jacks structures: 1. Rugged alloy steel precision spiral bevel gears 2. Hardened and tempered alloy steel drive shaft 3. High rigidity cast iron or nodular iron cast housing 4. Bronze Guide Sleeve 5. Heavy duty Taper roller bearing 6. Self locking acme screw or high precision ball screw single lead screws bevel gear jacks advantages: 1. High speed, especial for manual operated, 12 mm stroke per turn of hand wheel or hand crank 2. Internal spiral bevel gear sets ratio 1:1, 1.5:1, 2:1, 2.5:1. Customized other gear ratios 3. Multi-units arrangements, no demand miter gearbox for right angle transmit rotary motion, power and torque 4. Customized translating screw, keyed screw or rotating nut screw 5. Customized upright or inverted installation 6. Customized single drive shaft, two drive shafts, three drive shafts or four drive shafts 7. Customized spindle acme screw or ball screw travel length 8. Customized manual operated or electric driven 9. Customized corrosponding jack model following your required load capacity 10. Customized travel speed 11. Customized lifting screw end fittings 12. Customized kinds of accessories