Scope: Uses official Schlage M420/M422 specifications as reading examples, without assessing field loads or whole-door security performance.
Specifications
- Reading focus
- Per-leaf versus complete-device values
- Manufacturer's original unit
- lb. (holding-force unit in this example)
Identify which leaf the value describes
The manufacturer specifies 500 lb. holding force for single-door M420 and explicitly 500 lb. per leaf for double-door M422. Keep per leaf together with the recorded value.
Sources: [1]
Do not simply add double-door values
Each leaf has its own locking position. Adding the two values does not establish that either single leaf can withstand the combined force.
Sources: [1]
What this parameter answers
When comparing documentation, confirm leaf count, configuration and manufacturer units first. This field provides no overall performance conclusion for the site frame, mounting components or door leaf, and does not replace installation documentation.
Sources: [1]
Sources
- Schlage · M420/422 Mag Locks
Scope of holding-force markings for single doors and per leaf on double doors.
Manufacturer documents are provided in their original language.