Thin

0.18 mm/

0.007 in.

THIN

Dimension leaders/ witness lines, dimension lines, object lines seen in the distance, and most patterns.

Medium

0.25 mm/

0.010 in.

MEDM

Minor object lines, line terminators (arrowheads and ticks), hidden lines, and note leader lines.

Medium thick

0.35 mm/

0.014 in.

MEDT

Most object lines, text, schedule boxes, and charts.

Thick

0.50 mm/

0.020 in.

THIK

Minor title underlining, title text, object lines requiring special emphasis.

Extra thick

0.70 mm/

0.028 in.

XTHK

Use sparingly for underlining titles and separating portions of drawings, elevation grade lines, building footprints, and top of grade markings.

Optional

1.00 mm/

0.040 in.

OPTI

* Layer name modifier to use when layers are separated by line weights such as title blocks and details.