up to 200 lb., high-frequency up to 400 lb., medium-frequency up to 600 lb., low-frequency
Heavy Duty (LL):
up to 1,000 lb. low-frequency
FREQUENCY DEFINITIONS (OPENS/CLOSES)
Low-frequency = 10x per day or less Medium-frequency = 10x-24x per day High-frequency = More than 25x per day and/or abused doors (ones that often get slammed against a stop, operate in a school, etc.)
Load/Frequency Rating For 1-3/4" doors except where noted. 48" max. door width in 16 gauge hollow metal (min.) or 1/8"aluminum (min.). Frequency of use and door weight determine the hinge duty needed. SELECT Geared Continuous Hinge model numbers indicate appropriate hinge duty.
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.