Help Center


CAD drafting Fillet 0    Ribbon: Home, Draw – Modify > CAD software Fillet 1 Fillet

CAD drawing Fillet 2   Menu: Modify – CAD drafting Fillet 3 Fillet…

CAD software Fillet 4   Toolbar: Modify – CAD drawing Fillet 5

CAD drafting Fillet 6 Command line: MFILLET

This command is used to create fillets in the intersection points of objects, with automatic dimensioning ability. The command can create fillets individually.

The Fillet command can be used for quick trimming or lengthening of selected objects. To do it, press SHIFT button when you select objects: a current value of fillet radius is temporarily changed to 0 and objects are lengthened or trimmed to intersection point.

CAD software Fillet 7

It is possible to make a fillet between parallel segments. A current value of fillet radius is temporarily changed to a value, which equals to half distance between parallel segments. The dialog box opens after the command is launched:

CAD drawing Fillet 8


CAD drafting Fillet 9

This button switches on the lines cutting mode.

CAD software Fillet 10

This button switches to insert circle instead of fillet.

When performing an operation in this mode, the modes of dimensioning and complete or partial trimming of mating lines are ignored.

CAD drawing Fillet 11

CAD drafting Fillet 12

Button to enable fillet insertion mode as a mate.


Radius of fillet.

CAD software Fillet 13

This button temporarily closes the dialog box to allow measuring of the fillet radius on the drawing. The Value picker dialog appears to perform measurements.

CAD drawing Fillet 14

This button fully cuts lines before their intersection.

CAD drafting Fillet 15

This button switches on the mode for cutting of lines before their intersection.

CAD software Fillet 16

This button switches on the mode without lines cutting.

CAD drawing Fillet 17

This button switches on the additional dimensioning mode.

The button becomes available when the CAD drafting Fillet 18 Measure fillet button is enabled.

CAD software Fillet 19

CAD drawing Fillet 20

This button switches the automatic dimensioning mode on/off.

CAD drafting Fillet 21

This button temporarily closes the dialog box to allow copying of properties from created fillets.

Double-click or right-click in the fields to enter values will open the context menu with the list of the recently entered values:

CAD software Fillet 22

Options in the context menu and in the command line are available during the process of fillet creation:

CAD drawing Fillet 23

Command options:


The Fillet dialog box opens to change the chamfer parameters.


Finishes the creation of one group of fillets and starts another. The command is applied when you need to create some fillets with one radius on one object and with the same radius on another object:

CAD drafting Fillet 24


Switches to the mode for creating chamfers. The Chamfer dialog box opens to specify the parameters of the fillet.


Switches to the mode of making fillets along a whole selected polyline.

If a fillet radius does not equal zero the command creates fillet arcs for every node, created by crossed line segments, if they have a length enough for fillet creation.

CAD software Fillet 25



Consecutive cancellation of previous actions, without exiting the command mode.


To create a fillet:


1.    Select the first object.

2.    Move the cursor over the second object. Fillet options will be presented.

3.    If there are no fillet options, select the Properties option from the context menu or the command line and adjust the radius.

4.    Select the second object.

5.    Select the fillet from the presented options.


Features of the command work

The command works in 3D. To perform the command, the source entities should be located in the same plane.

If you press and hold SHIFT when selecting the second object, then a corner will be formed (closing in the intersection point and cutting off).

CAD drawing Fillet 26

For pairs of objects LINE-ARC, ARC-LINE and ARC-ARC, two types of fillet are available: outside and inside ones.

CAD drafting Fillet 27 CAD software Fillet 28

A fillet that combines inside and outside tangency is additionally available for ARC-ARC pair.

CAD drawing Fillet 29

NOTE:        Availability of different types of fillet depends on the fillet radius. Outside and combined fillts require larger radiuses than for inside fillets.

Selecting two parallel lines will create a fillet with a radius equal to half the distance between them (regardless of the specified Length). The sides will automatically align to the longest line.

CAD drafting Fillet 30

Fillet of parallel lines also works for segments of the same polyline.

CAD software Fillet 31

A fillet side depends on the mouse cursor position when the second object is selected

When making an insertion, a polyline retains its integrity.

If one polyline is formed of two polylines as a result of the command, then it will be a single polyline object.

If segments of one polyline separated by other segments are selected, then all these intermediate segments are deleted.

CAD drawing Fillet 32


Fillet Command (Non-dialog Mode)

CAD drafting Fillet 33 Command line: F, FILLET

Creates a fillet using the command line.

Command options:


Opens additional options for selecting objects.


Cancels a previous action in the command.


Creates fillets for all polyline vertices which are the intersection points of two straight line segments. When the Trim option is enabled, fillet lines become new segments of polylines.


Sets the fillet radius. When set to zero, objects are lengthened or cut to intersect.


Controls objects cut to fillet lines.

Trim -selected objects are removed to the endpoints of the fillet lines. If the objects do not intersect with the fillet line, they are lengthened or clipped to the endpoints of the fillet line.

No_Trim – selected objects are not cut.


Adds a fillet to multiple sets of objects.

Command prompts:

Soecify first object or [?/Undo/POlyline/RaDius/Trim/Multiple]:

Select the first fillet object or the required option to set parameters.

Specify second object or Shift-select to apply corner or [?/RaDius]:

Select the second fillet object or use Shift key to form an angle in the intersection point. To change parameters, select the required option.


Info: NanoCAD is a user friendly, inexpensive, and yet professional, CAD software tool for personal computer, that allows a great user experience by providing top-level performance, full capability, a classic interface and native.dwg format support. nanoCAD has been built to deliver design and project documentation for all engineering purposes. nanoCAD includes a full suite of basic and advanced CAD tools for 2D/3D drawing and creating industry-standard DWG-compatible CAD files. Our software ensures progressive, collaborative and customizable features to enhance your efficiency, and includes a few API's, allowing anything from routine task automation to complex CAD application development. You may download nanoCad for free, using the links below, and purchase later, in case you like it.
We collect Cookies
We use cookies to ensure that we give you the best experience on our website. By clicking “Accept”, you agree to our website’s cookie use as described in our Privacy Statement.