Technical drawings demand leads that hold their grade consistently through hours of drafting work. TK 9400 refill leads maintain uniform density from first stroke to final detail, eliminating the mid-drawing grade shifts that compromise precision work. Faber-Castell produces these 2mm leads to exacting specifications, ensuring each degree of hardness performs predictably whether you're laying down construction lines in 4H or adding emphasis with 2B.

Eleven degrees span the full range from 6B through 6H, giving you precise control over line weight and density. Harder grades handle technical layouts and engineering drawings where consistent, light lines matter; softer grades bring depth to architectural sketches and figure studies. Individual lead replacement proves more economical than replacing entire pencils, and the ability to sharpen leads yourself means you control tip geometry for specific applications.

These leads work seamlessly with TK 9400 clutch pencils, though they fit most standard 2mm holders. Keep multiple grades loaded in separate pencils to switch between line weights without stopping to change leads mid-drawing.