Standard Duty [SD] Tested per BHMA standards for medium-frequency doors up to 200 lb. without frame or door reinforcement.
Heavy Duty [HD] Tested per BHMA standards. Up to 200 lb. doors (high-frequency) and up to 400 lb. doors (medium-frequency) without frame or door reinforcement; up to 600 lb. doors (low-frequency) with the use of Rivnuts in the frame and door.
Heavy Duty [LL] Our HD hinge with additional fastener holes for low-frequency doors up to 1,000 lb., including most lead-lined doors. Rivnuts are recommended in the frame and door on extremely tall, extremely heavy or wide doors.
All geared hinges are covered by our never-ending Continuous Warranty to be free of defects in material and workmanship.