Ball bearing hinges may have two, three or five knuckles. They differ from plain bearing hinges in that they have a steel ball bearing, or buffer, in between the knuckles. Standard weight ball bearing hinges have bearings only at the top and bottom knuckles, so a five-knuckle hinge would have two bearings. Heavy-duty ball bearing hinges have bearings between every knuckle. These units tend to be durable, better performing and less noisy than standard hinges.
Roton Continuous Hinges Replacements for Aluminum and Steel Doors. Select from Full Surface, Half Surface, Concealed Leaf Hinges
Continuous Geared Hinges provide a long lasting solution for high traffic and high traffic doors. Geared hinges extend the full length of the door and leaves no open gap for high security and evenly distributes the weight of the door along the entire opening. Both hinge leaves rotate on the same joint and absorb the lateral wear and tear of the door and frame. The weight of the door is supported by Self Lubricating bearings that last the life of the opening. Continuous Hinges do not require any door preparations and can be used in new construction or retrofit applications.
Ideal for schools, hospitals, and other high-use environments. One piece seamless steel spring tube. Double heat treated steel, tempered springs. Adjustable latching and sweep speed valves. Full rack and pinion operation. Precision machined, heat treated steel piston.
Provides increased reinforcement at the top corner of the door and jamb where stress can occur. Full surface reinforcing hinges can be added to doors troubled by sagging. For medium and heavy weight doors subject to high frequency and abuse.