The identity card of the drawing
A title block is the framed panel of information that sits on a technical drawing, almost always in the bottom-right corner of the sheet. The corner is not an accident: when drawings are folded or stacked in a pile, the bottom-right stays visible, so you can identify a sheet without unfolding it.
On its own, the rest of the sheet is just geometry. The title block is what makes it a controlled document — it answers, in one place, “what part is this, at what scale, in what units, made of what, and which version am I holding?”
What goes in a title block
Exact layouts vary by company and standard, but a title block almost always carries this information:
| Field | What it tells the shop |
|---|---|
| Part name & number | Which part this is, and how to file it |
| Scale | The ratio of the drawing to the real part, e.g. 1:2 |
| Units | Whether dimensions are in mm or inches |
| Material | What the part is made from |
| Finish / treatment | Surface finish, coating or heat treatment |
| Default tolerances | How much un-toleranced dimensions may vary |
| Revision / version | Which iteration of the part this sheet is |
| Drawn by / date | Who created it and when, for traceability |
Why it matters
The title block prevents the two mistakes that quietly ruin parts: building the wrong size and building the wrong version. Units and scale stop a part being cut at the wrong dimensions; the revision number stops a shop machining an out-of-date design. It is also where default tolerances live, so the drawing does not have to repeat a tolerance on every single dimension.
You do not have to fill it in by hand
When you make a drawing with TechDraw AI, the title block is generated for you and filled with the scale, units and the measurement you set, so the sheet is ready to send without manual drafting. For the bigger picture of what else belongs on the sheet, see what is a technical drawing and whether you need tolerances.