In architectural design and construction documentation, a is a pre-drawn 2D or 3D digital symbol used in AutoCAD and other CAD software to represent interior locking mechanisms. These blocks are essential for detailing door hardware in floor plans, elevations, and sections, ensuring that egress requirements and hardware specifications are accurately met. Types of Thumb Turn Lock CAD Blocks
: Used in floor plans to show the location and clearance of the turn knob relative to the door leaf. Elevation Blocks
In public buildings (or universal design homes), the thumb turn cannot require tight pinching. It must be a lever. Your CAD block must show a longer, horizontal wing that can be operated with a fist. This is critical for code compliance.
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