Drawing Socket Screws (Mechanical Toolkit)

This Tech Tip demonstrates how the Mechanical Toolkit facilitates the drawing and annotation of some common mechanical components.

Note: please make sure that the drawing units are set to "mm" (millimetres) before using the mechanical toolkit functions.

Drawing Fasteners

Toolkit Menu › Mechanical... › Fasteners › Socket Screws

The following dialog will appear:


  • Select a screw from the drop-down list, or fill in the relevant data.
  • Select which view of the screw you would like to draw (top, side, or both).
  • Select which line type to use when drawing the top and side views (solid or hidden).
  • Press OK to draw the screw.

Using the Repeat function:
The repeat function is used to draw multiple equi-spaced copies of the screw. To draw multiple copies of the screw in a straight line:
  • Select "Linear"
  • Enter the number of nuts you want to draw in the input box labelled "Number"
  • Enter the distance between the screw centres in the spacing input box below that
  • Click on the OK button.
To draw multiple copies of the screw in a circular arrangement:
  • Select "Polar"
  • Enter the number of screws you want to draw in the input box labelled "Number"
  • Select either "Spacing" or "PCD" from the list box
  • If you selected "Spacing", then enter the distance between the screw centres
  • If you selected "PCD", enter the PCD of the circle on whose circumference the screws will be arranged
  • Press OK to draw the specified nut.
Note that the side view will be disabled if you select the Repeat Polar function.

Adding and deleting Screws:
You may add your own screw definitions by clicking on the "Add" button, and then entering the relevant data. The screw definition will then be saved when you click on OK, or select another screw definition from the list.

Warning: If you modify an existing screw definition, you will be asked to 'save the changes', 'save the changes as a new definition', or 'leave the definition as it was' (discard changes). It is advisable to save your changes as a new definition so as to add this to your library.

Select "No" to avoid changing the original screw definition.

Draw the side view:
The side view will only be drawn if the "Side View" checkbox was checked. If you checked the "Automatically align the side view" checkbox, then AllyCAD will prompt:

Indicate the position of the Screw side view (auto align)

In this case, the screw side views will be drawn aligned to an existing line.

Click on the thread side of a line as illustrated in below.


The screw will then be drawn as illustrated in (2) below (i.e.: the screw will "snap to" the nearest line).


If you did not check the "Automatically align the side view" checkbox, then AllyCAD will prompt:

Indicate the position of the Screw side view

In this case, the screw side view will be positioned where you indicate on the drawing, and you will be prompted to select the rotation of the screw from a pop-up menu.

To accurately position the cursor, use the snap functions.

Drawing the top view:


If the "Top View" checkbox was checked then AllyCAD will prompt:

Enter screw centre for Plan view (spacebar to stop)

Indicate the position for the centre point of the screw plan.

AllyCAD will prompt:

Enter a point on the screw centre line (Spacebar to Stop)

Indicate a point on the centre line of the screw plan. This point will be used to rotate the screw plan drawing.


Note: To draw the screw top view with no rotation, click on the same point when prompted for the screw centre and the screw centre line.

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