Why Stencils Need Bridges, and Where They Go

Send a logo to be cut as a stencil and something has to change. It is not a flaw in your artwork — it is the physics of cutting a shape out of a sheet and expecting the sheet to hold together.

The change is bridges. Getting them right is most of the difference between a stencil that looks like your logo and one that looks like a mistake.

What a bridge actually is

Look at a capital O. The outer ring is what you want to paint. The disc in the middle is not part of the letter — it is a hole in the letter. But it is also a separate island of material, connected to nothing.

Cut that shape and the middle drops out. You are left with a filled circle instead of an O.

A bridge is a deliberate strip of uncut material joining that island to the surrounding sheet. It shows in the painted result as a small gap in the stroke. Every stencil ever made has them, including the military lettering the whole look descends from.

Which characters need them

Any closed shape. In practice: A B D O P Q R and 0 4 6 8 9, plus lowercase a b d e g o p q. Some letters need two — a capital B has an upper and lower counter, and each is a separate island.

Logos are less predictable. A circular badge with text inside it may have the entire centre floating. Anything with an outline, a border or an enclosed negative space needs the same treatment.

Our minimum bridge width is 1.8mm

That figure is not the laser's limit. The laser will happily cut a 0.3mm bridge, and it will look perfect on screen and on the proof.

It will not survive being used.

A bridge below roughly 1.8mm fails in three predictable ways:

• Handling. Stencils get peeled off wet surfaces, rolled, carried in a ute. A thin bridge tears at the first bit of tension.
• Cleaning. Paint builds up around cut edges. Wiping across a narrow bridge, especially with dried paint on it, snaps it.
• Paint load. Wet paint adds weight and makes material cling. Thin bridges deform, and the island sits proud of the surface and bleeds.

Once a bridge breaks the stencil is finished, because the island it was holding is now loose. There is no repair that gives you a clean edge again.

So 1.8mm is a durability figure, chosen from what comes back and what lasts. It is a floor, not a target — on a large stencil that will see heavy use, we go wider.

Where a bridge goes matters as much as how wide it is

This is the part that separates a stencil that reads as your brand from one that reads as a cheap copy of it.

Follow the logic of the letterform. On an O, bridges belong at the thinnest part of the stroke — roughly the ten o'clock and four o'clock positions on most typefaces — because that is where the eye already expects the weight to change. Put one at the very top or bottom, through the thickest part, and it reads as damage.

Be consistent across the word. If the O has bridges at ten and four, the D and the P should follow the same convention. Bridges scattered at different angles across a word look accidental, even when each one individually is fine.

Use existing breaks. Where a logo already has a gap, a change of colour or a join between elements, a bridge placed there disappears entirely.

Keep them off detail. A bridge through the middle of fine text or a recognisable feature costs more than one placed a few millimetres away in dead space.

The other problem: narrow webs

Bridges get the attention, but the more common cause of a failed stencil is the web — the material remaining between two cuts.

Two letters set tightly, a thin outline around a shape, or a serif that tapers to a point all create places where the sheet narrows to almost nothing. Those are as fragile as an undersized bridge, and there is no single feature to point at.

The same 1.8mm rule applies. When artwork has strokes or gaps below it, we thicken them slightly. On most logos that adjustment is invisible at a glance and is the reason the stencil still works after fifty uses.

What this means for your artwork

Bold, even-weight fonts stencil best. A heavy sans serif has thick strokes and generous counters, so bridges sit comfortably and webs stay wide. It is why stencil typefaces look the way they do.

Thin and script fonts are hard. A hairline serif or a fine script may have strokes narrower than 1.8mm before anything is cut. Those have to be thickened, which changes the character of the type. Sometimes noticeably.

Size solves most problems. The same logo at A3 has strokes twice the width it has at A5. If your artwork is detailed, going up a size band is often better than compromising the design. It is also cheaper than ordering twice.

Vector files help, but do not change the physics. An AI, PDF, SVG or EPS scales cleanly and gives us exact edges to work from. A 1mm stroke is still a 1mm stroke in a vector file.

You see it before we cut

Every order gets a digital proof, usually within one to two business days. The proof shows the artwork at size, the 50mm overspray border, and every bridge we have added or adjusted.

If a bridge sits somewhere you do not want it, say so and we move it. That conversation is free and it is much easier before cutting than after. Nothing goes to the laser until you have approved it.

The short version

• Enclosed shapes need bridges or their centres fall out.
• Ours are at least 1.8mm, because thinner ones break in use rather than in the machine.
• Placement follows the letterform, stays consistent, and hides in existing breaks where it can.
• Narrow webs between cuts fail the same way and get the same treatment.
• Bold fonts and larger sizes make all of this easier.
• You approve a proof showing every bridge before anything is cut.

Not sure whether your logo will work? Send it to info@tinkable.com.au before you order and we will tell you honestly what has to change. If the answer is that it will not stencil well at the size you want, we would rather say so than take the order.

Ready to go? Upload your artwork on our custom stencil page, or read what a custom stencil costs first.