There are 3 common mast types:
- Duplex (2 stage): Mast has 2 sections, one outer that does not move and an inner section that raises and elevates the carriage and forks.
- Triplex (3 Stage): Consists of three sections (one outer and two inner rails). The 2 inner sections raise from outside to in as the mast elevates higher. The mast type provides a shorter lowered height for use through doorways.
- Quad (4 Stage): consists of four sections (one outer and three inner rails). These sections raise from outside to in, in four sections as the mast raises. Quad masts have the shortest lowered height for its lift and are used where there are very low height restrictions such as container doors.
