Corrugated top sheet assembly forms a strong torque cylinder for strength and easy operation, and conceals the spring mechanism.
Corrugated door curtain, available in round or square profile, is hot-dipped, galvanized 26-Ga. steel, primed then finished with high gloss silicone polyester paint.
Polypropylene anti-wear strips come factory-installed as continuous guides for sliding metal parts, providing quieter operation and longer service life.
Axle casting assembly holds constant door tension, and allows easy adjustments. Heavy-duty steel bracket plates rigidly support axle, spring and door.
Drum wheel is deep-drawn galvanized steel with 1-5/16" steel bearings.
Bottom bar assembly includes heavy-duty steel angle, extruded aluminum bottom bar and replaceable tubular-type vinyl astragal.
Slide-bolt assemblies made of heavy-duty steel lock the closed door from inside at the bottom corners. For added security, both slide bolts accept padlocks. An exterior sliding curtain lock also is available.
Roll-up door guides are 14-Ga. galvanized steel, 2" wide. DS-200 guides install to masonry, steel or wood construction equally well.
Automatic door stops prevent door from rolling up past the header.
Tempered steel springs are engineered to counterbalance different door sizes and weights for smooth, easy operation and long service life. Both springs are clip-welded to the axle for correct location and extension.
Heavy-duty steel axle supports door curtain and counterbalance system.