Screw jacks are just one member of the linear motion family, more suitable for relatively low duty cycles. A customer had a problem we had to trouble shoot that highlighted what not to do. There are two common types of screw jacks. Ball screw jacks have recirculating balls in the threads that reduce friction, allowing for higher duty cycles than the other type. Machine, or acme thread, screwjacks have a sliding action similar to a nut and bolt. This limits the duty cycle and actuation speed because of the increased friction. The benet of this type is they are typically self locking where ball screws are not. The majority of our sales are in the area of machine screw jacks in metric dimensions. Within these screw jack types there are two versions. What we call our standing version has the

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