For manually sliding doors. One pair of tandem truck assemblies per door. Door Weight not to exceed 5,000 lbs.
Sold as a pair (2 ea.)
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NOTE: Only (1) one pair of tandum truck assemblies are to be used per door regardless of the size of the door. Attaching more than two trucks on a single door can create a fulcrum or "teeter totter" effect causing uneven wear to the trucks and track.
Designed for extremely heavy doors, a four-wheel tandum truck unit should be used. Two wheels are machined flat, while the two opposite wheels are machined with a concave groove that maches the radius rod the dors in the #25 track system. As a result there is conserable less friction between the rollers and the truck unit. The load bar hanges from a central point.
For metal doors with sufficient reinforcing in the top of the door to support the door's own weight.