100

Subclass marker (AcDbDimension)

2

Name of the block that contains the entities that make up the dimension picture

10

Definition point (in WCS). DXF: X value; APP: 3D point.

20, 30

DXF: Y and Z values of definition point (in WCS)

11

Middle point of dimension text. (in OCS).
DXF: X value; APP: 3D point.

21, 31

DXF: Y and Z values of middle point of dimension text. (in OCS)

70

Dimension type.
Values 0 - 6 are integer values which represent the dimension type. Values 32, 64, and 128 are bit values, which are added to the integer values (value 32 is always set in R13 and later releases).
0 = Rotated, horizontal, or vertical; 1 = Aligned
2 = Angular; 3 = Diameter; 4 = Radius;
5 = Angular 3 point; 6 = Ordinate
32 = Indicates that the block reference (group code 2) is referenced by this dimension only.
64 = Ordinate type. This is a bit value (bit 7) used only with integer value 6. If set, ordinate is X-type; if not set, ordinate is Y-type.
128 = This is a bit value (bit 8) added to the other group 70 values if the dimension text has been positioned at a user-defined location rather than at the default location.

1

Dimension text explicitly entered by the user. Optional; default is the measurement. If null or "<>", the dimension measurement is drawn as the text, if " " (one blank space), the text is suppressed. Anything else is drawn as the text.

53

The optional group code 53 is the rotation angle of the dimension text away from its default orientation (the direction of the dimension line).

51

All dimension types have an optional 51 group code, which indicates the horizontal direction for the dimension entity. It determines the orientation of dimension text and lines for horizontal, vertical, and rotated linear dimensions.
This group value is the negative of the angle between the OCS X axis and the UCS X axis. It is always in the XY plane of the OCS.

210

Extrusion direction. (optional; default = 0, 0, 1).
DXF: X value; APP: 3D vector

220, 230

DXF: Y and Z values of extrusion direction

3

Dimension style name