Generally, standard strokes / raises are:

• Up to 1000mm on 5kN E-Series metric screw jacks
• Up to 2500mm on 10kN E-Series metric screw jacks
• 18 inches on 1/4 tom M-Series imperial (inch) screw jacks
• 40 inches on 1/2 ton M-Series imperial (inch)screw jacks
• 98 inches on 1 ton M-Series imperial (inch) screw jacks
• 55000mm on 25kN and above E & S Series metric screw jacks
• 215 inches on 2 Ton and above M-Series imperial (inch) screw jacks

Larger Screw Jacks have their maximum raise / stroke available limited only by the available length of bar stock from suppliers (note - special steel production runs can be organised for special applications) and the practical ability to handle, machine and transport the lead screw and the complete screw jack. Practical lengths will also be affected by whether the screw is to be subjected to compression or tension loads. Depending on diameter the length can be limited due to deformation of material in the machining process or column strength of the screw when subjected to compression loads.

Long raise applications should be checked with Power Jacks for the following:a) Side loads on extended screw.b) Column strength of screw.c) Thermal rating of screw and nut.Power Jacks recommend guides be used on all applications. The longer the raise, the more important this becomes.