Triple mast

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A triple mast, or "3-stage mast," is a lift truck mast that has three sections. The outer section is mounted to the lift truck. The intermediate section telescopes within the outer section. The inner section telescopes within the intermediate section. Both the intermediate section and the inner section elevate as the lift cylinders extend. The fork carriage rides within the inner section.

These masts are usually equipped with a center cylinder to allow the fork carriage to elevate some distance before the mast sections begin to extend. This type of mast provides a shorter lowered height for a given lift height than the double mast. Triple masts are usually used where overhead clearances, such as doorways, are a concern.^[1]