... 0.5ton, RN-1 ton, RN-2 ton, RN-3 ton, RN-5 ton, RN-10 ton, RN-15 ton, RN-20 ton, RN-30 ton, RN-40 ton, RN-50 ton ... now ready for normal operations.* The screw jacks should have a longer length of stroke ... important that the lifting screws of the jacks are not screwed beyond the closed height ... not,need to add extra bearing blocks.* Screw Jacks&Right Angle Spiral Bevel Gearbox Working Temperature?Screw ...