The Use of a Compression Anchor on a Hollow Metal Door Frame (Typically used in a drywall application)
A compression anchor, sometimes referred to as a tension screw, is typically located near the top of each door jamb on a hollow metal frame. Its primary purpose is not to secure the frame to the wall, but rather to assist in aligning the frame so that it is plumb, level, and square during installation.
The compression anchor works by applying controlled pressure between the frame and the wall structure. This allows the installer to make minor adjustments to the frame position before permanently fastening it. Once the frame has been properly aligned, the permanent wall anchors that the frame is prepared with can then be used to securely fasten the frame to the wall.
Compression anchors are most commonly used on knockdown (KD) three-piece frames, where slight adjustments may be required during assembly and installation. On fully welded frames, however, the presence of a compression anchor generally provides little to no functional benefit, as welded frames are already rigid and typically rely solely on their standard wall anchoring system.
For best results, it is recommended that a hand screwdriver be used when adjusting the compression anchor, rather than a power drill. Using a screwdriver allows the installer to apply pressure gradually and with greater control. Over-tightening the compression anchor—especially with a power drill—can cause the frame to bow toward the door opening, which may negatively affect door clearances and overall door operation.
Proper use of the compression anchor helps ensure that the frame is correctly aligned before final anchoring, contributing to smooth door operation and a properly installed opening.
