Create ANSI and ISO standard threads on convex cylindrical faces, like shafts and bolts. Threads appear as dashed lines at the top of the cylindrical face in drawings.

The External thread feature allows you to create ANSI and ISO standard threads on convex cylindrical faces, like shafts and bolts, which can then be viewed in drawings.

Click the External thread tool on the Part Studio toolbar. Select the Cylinder edges of either the shafts or other convex cylindrical faces in the graphics area. Note that you can select multiple edges at once if they are the same size. For different sizes, create additional External thread features.

Select a standard: ANSI or ISO. The Size is automatically selected based on the standard selected and the cylinder diameter. If you change the standard, you must manually select a size in order for the automatic sizing to be provided. Select the number of threads per inch (for ANSI standard) or Pitch (for ISO standard).

Select either Blind (extend the threads to the Length specification) or Up to Next (extend the threads to the next Face).

Check Add Chamfer to add an optional chamfer at the top of the thread. Specify the Length and Angle for the chamfer.

Check Add undercut to add an optional undercut at the bottom of the thread. Specify the Diameter and Length of the undercut. Alternatively, instead of opting for an Undercut, you can split the face (default), or uncheck to keep the face intact.

Click the checkmark to accept the new External thread.

  1. Select an edge or edges of either a shaft or other convex cylindrical face on your model.

    You can select multiple edges at once if they are the same size. For different sizes, create additional External thread features.

  2. Click External thread tool icon:

    The External thread dialog opens:

  3. Select a standard.
    • ANSI
    • ISO
  4. The Size is automatically selected based on the standard selected and the cylinder diameter.

    If you change the standard, you must manually select a size in order for the automatic sizing to be provided.

  5. Select the number of threads per inch (for ANSI standard) or Pitch (for ISO standard).
  6. Select either Blind (extend the threads to the Length specification) or Up to Next (extend the threads to the next Face).
  7. Add an optional Chamfer at the top of the thread:
    1. Check the box next to Add chamfer.
    2. Specify the distance of the chamfer, how far down the shaft from the surface.
    3. Specify the angle of the chamfer.
  8. Add an optional Undercut at the bottom of the shaft.

    Undercut diameters default to 0.015" diametrically below the minor diameter. The length defaults to 2X the pitch of the thread. These measurements autosize with different thread/pitch combinations.

  9. Add an optional split face, if needed (not available when Undercut is selected).
  10. Click Accept checkmark icon.

Calling out external threads in drawings

Use the Hole/Thread callout tool in a drawing to add a callout to an external thread feature. You can find the tool on the Drawings toolbar Hole callout tool icon:

Feature toolbar with Hole callout icon

  1. Select an edge or edges of either a shaft or other convex cylindrical face on your model.

    You can select multiple edges at once if they are the same size. For different sizes, create additional External thread features.

  2. Tap External thread tool icon:

    The External thread dialog opens:

    Default External thread dialog on Android platform

  3. Select a standard.
    • ANSI
    • ISO
  4. The Size is automatically selected based on the standard selected and the cylinder diameter.

    If you change the standard, you must manually select a size in order for the automatic sizing to be provided.

  5. Select the number of threads per inch (for ANSI standard) or Pitch (for ISO standard).
  6. Select either Blind (extend the threads to the Length specification) or Up to Next (extend the threads to the next Face).
  7. Add an optional Chamfer at the top of the thread:
    1. Check the box next to Add chamfer.
    2. Specify the distance of the chamfer, how far down the shaft from the surface.
    3. Specify the angle of the chamfer.
  8. Add an optional Undercut at the bottom of the shaft.

    Undercut diameters default to 0.015" diametrically below the minor diameter. The length defaults to 2X the pitch of the thread. These measurements autosize with different thread/pitch combinations.

  9. Add an optional split face, if needed (not available when Undercut is selected).
  10. Click Accept checkmark icon.
  1. Select an edge or edges of either a shaft or other convex cylindrical face on your model.

    You can select multiple edges at once if they are the same size. For different sizes, create additional External thread features.

  2. Tap External thread tool icon:

    The External thread dialog opens:

    Default External thread dialog for iOS platform

  3. Select a standard.
    • ANSI
    • ISO
  4. The Size is automatically selected based on the standard selected and the cylinder diameter.

    If you change the standard, you must manually select a size in order for the automatic sizing to be provided.

  5. Select the number of threads per inch (for ANSI standard) or Pitch (for ISO standard).
  6. Select either Blind (extend the threads to the Length specification) or Up to Next (extend the threads to the next Face).
  7. Add an optional Chamfer at the top of the thread:
    1. Check the box next to Add chamfer.
    2. Specify the distance of the chamfer, how far down the shaft from the surface.
    3. Specify the angle of the chamfer.
  8. Add an optional Undercut at the bottom of the shaft.

    Undercut diameters default to 0.015" diametrically below the minor diameter. The length defaults to 2X the pitch of the thread. These measurements autosize with different thread/pitch combinations.

  9. Add an optional split face, if needed (not available when Undercut is selected).
  10. Click Accept checkmark icon.

Defaults

An example of an External thread feature with the defaults accepted:

External thread dialog and example of defaults

External thread during creation, above

External thread, with default accepted, after feature is accepted

External thread after dialog is accepted, above

Thread callout on drawing

A hole/thread callout on a drawing, showing the size (1/2) and threads per inch (13), above

When a thread is occluded, it is reflected in the drawing image, above

Chamfer

An example of an External thread feature with a chamfer applied:

External thread with chamfer appiled

External thread with chamfer during creation, above

External thread, with chamfer, after feature is accepted

External thread with chamfer, after dialog is accepted, above

Thread with chamfer callout on drawing

A hole/thread callout on a drawing, showing the size (1/2) and threads per inch (13), above

Chamfer with up to next selected, below:

External thread with up to next and chamfer selected

Undercut

An example of an External thread feature with an undercut applied:

External thread with undercut added, with dialog open

External thread with undercut during creation, above

External thread with undercut added, with dialog accepted

External thread with undercut, after dialog is accepted, above

External thread with undercut drawing

A hole/thread callout on a drawing, showing the size (1/2) and threads per inch (13), above

  • Threads are not included in Hole tables.

  • Find the callout under the Dimension menu, Hole/thread callout.