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CAD blocks

What are CAD blocks?

CAD blocks are named groups of objects that act as a single 2D or 3D object. You can use them to create repeated content such as drawing symbols, common components, and standard details. Blocks help you save time, maintain consistency, and reduce file size by reusing and sharing content rather than re-drawing it every time you need it.

With AutoCAD and AutoCAD LT software, you can create your own CAD blocks or choose from a large library of pre-made blocks, including:

  • Appliances
  • Doors and windows
  • Electrical fixtures
  • Electronic symbols
  • Fasteners
  • Furniture
  • Plumbing fixtures
  • Restaurant equipment

Dynamic blocks

You can add attributes or dynamic properties to CAD blocks so they can accommodate different text strings, shapes, or sizes. All CAD blocks can use the following properties:

  • Block unit
  • Color
  • Layer
  • Linetype
  • Linetype scale
  • Lineweight
  • Material
  • Name
  • Object name
  • Plot style
  • Position
  • Rotation
  • Scale X
  • Scale Y
  • Scale Z
  • Unit factor

Dynamic blocks let you edit individual block geometry. They eliminate the need to define a new block for every variation of shape and size.

Featured software using CAD blocks

Find and download CAD blocks, drawing symbols, and more with Autodesk Seek

Autodesk Seek
Find, preview, and download BIM files, CAD blocks, drawings, and specs directly into your Revit or AutoCAD design session with this free* web service.
Try it now

AutoCAD software is compatible with numerous CAD blocks used to meet design standards

Design every detail with AutoCAD software, one of the world's leading 2D and 3D design platforms.
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AutoCAD LT software produces CAD drawings compatible with CAD blocks

Edit, repurpose, and share drawings with AutoCAD LT software for 2D drafting and detailing.
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Working with dynamic blocks

A dynamic block has flexibility and intelligence. You can easily change a dynamic block reference in a drawing while you work, manipulating the geometry through custom grips or custom properties. Dynamic blocks let you adjust the block reference in place as needed, rather than search for another block to insert, or redefine the existing one.

For example, if you insert a door block reference in a drawing, you can easily resize the door by dragging the custom grip or by specifying a different size in the Properties palette. You can also change the open angle of the door. The door block can also contain an alignment grip, which lets you align the door block reference easily to other geometry in the drawing.

Discuss blocks with AutoCAD users

* Free products are subject to the terms and conditions of the end-user license and services agreement that accompanies the software.