Fasteners vary by wall type; typically, expansion bolts, tapcons, machine bolts, and wood screws are used. Inside the frame throat is a metal piece, which acts as reinforcement and guide for the fastener as the frame is secured in place. This metal piece can be supplied loose snap-in type or welded to the back of the frame throat. Hollow metal frames are durable, which makes them a great choice for the interior and exterior openings of hospitals, schools, […].
Knock-down door frames also known as after-set drywall frames are hollow metal frames that are designed for easy installation. They […]. Does door and hardware jargon have you confused? Brush up on your knowledge or learn more about a term with […]. Compression Anchors Compression anchors are supplied on knock-down not welded , afterset frames. Masonry Anchors These are used on frames mounted to a masonry block wall. Once the style and type of door that has been chosen, the base material of the opening in which the door will be placed must be determined.
The base material will determine the type of fasteners that can used in that particular application. Most concrete fasteners are not available in a flat head countersunk head, this means that the selection for the correct anchor will be smaller than with most other applications. A female type anchor with a flat countersunk head can be used but are not recommended for this application because they are difficult to work with. Therefore, this article will not explore the use of this type of anchor.
Sleeve anchors are very versatile concrete fasteners because they come in a wide range of lengths, head styles and diameters. Sleeve anchors are designed to be used in a variety of base materials including concrete, brick, and block. These anchors are available in four head styles: acorn, hex, round and flat head. A flat head sleeve anchor would work perfectly for fastening metal door frames to base materials.
Sleeve anchors are manufactured for the hole size and the countersunk head type are designed into the door frame. The 1st table below displays the holding values in concrete and the 2nd table describes the holding values in grout filled block. To calculate a safe working load, divide the ultimate load by 4. Anchors for poured walls function the same but instead of placing a wire anchor between layers of block, the wire anchor is wrapped around rebar.
When the concrete is poured the commercial metal door frame is back-filled with concrete and formed into the wall. Universal stud anchors attach to both wood and metal studs. Hollow metal frames using universal stud anchors are meant to be installed during the wall framing stages. Commercial metal door frames must be installed before the drywall is hung. After the hollow metal door frame is anchored to the studs, the drywall is slid inside the frame return. Universal stud anchors are typically sold as a loose anchor that snaps into the frame throat but options for welded in anchors are available.
Hollow Metal Door Frames.
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