Answer
Feb 17, 2026 - 06:13 AM
The symbol for counterbore depth is usually the capital letter "D" or the word "DEPTH" (sometimes written as "DEEP") placed before or next to the depth dimension on a technical drawing. It is often accompanied by the counterbore symbol (⏚) to indicate the specific feature. For example, a drawing might show: ⏚ 10 D 5, meaning a counterbore diameter of 10 mm and a depth of 5 mm.
