H-type (Heavy-duty series) For TOP-OPENING FLAP DOOR with piano, butt, or concealed hinges. Opens to 70 degrees. Holds the door in a fully-opened position. Used in pairs (left & right) 3.5x15 steel screws provided. Available in 3 weight ranges: Light Duty, Medium Duty, and Heavy Duty.
Torque Calculation: Torque = Door Height x 1/2 x Door Weight K-Type (Light Duty): 140~200 kg-cm (121~173 lbs-inch) per pair
M-Type (Medium Duty): 200~250 kg-cm (173~216 lbs-inch) per pair
H-Type (Heavy Duty): 250~300 kg-cm (216~260 lbs-inch) per pair
