Last updated: August 23, 2026
Nozzle size is the specification people worry about most and change least. It is printed on every listing, it sounds precise, and it drives a lot of purchasing anxiety: buy the wrong number and you have supposedly bought the wrong airbrush.
In practice the useful range for hobby painting is narrow, one size covers most of it, and the number on the box interacts with your paint and your pressure rather than deciding anything on its own. Here is what each size actually does.
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Quick Answer
What airbrush nozzle size should you use?
- 0.3mm or 0.35mm is the all round hobby size and the right answer if you own one airbrush.
- 0.2mm gives finer freehand and demands thinner paint, more cleaning and more patience.
- 0.5mm and above is for terrain, large scale models and spraying primer quickly.
- The needle must match the nozzle. They are a matched pair, not two separate choices.
Bottom line: buy 0.3mm or 0.35mm first, and only add a second size when a specific job keeps frustrating you.
What the Number Measures
The figure is the internal diameter of the nozzle opening, which sets how much paint can pass through at a given pressure. A smaller opening allows less paint and finer atomization, so it draws a thinner line. A larger opening allows more paint through, covers ground faster, and tolerates coarser pigment.
What it does not measure is quality, precision of manufacture, or how fine a line the brush will actually pull, all of which depend on the nozzle and needle fit as much as on the number.
Needle and Nozzle Are a Pair
The needle tapers to seal inside the nozzle, so the two are machined to match. Fitting a 0.3mm needle into a 0.5mm nozzle does not give you a 0.4mm setup, it gives you a brush that will not seal and will drip. Any nozzle change means changing the needle with it, and often the crown cap too.
Nozzle Sizes Compared
The whole hobby range in one place. Sizes are the figures manufacturers print on their own listings, and the boundaries between them are softer than the table suggests, because pressure and paint consistency shift what each one can do.
| Nozzle size | Handles well | Struggles with | Typical owner |
|---|---|---|---|
| 0.2mm | Fine freehand, thin glazes, small scale camouflage | Primer, metallics, heavy pigment | Second brush for detail specialists |
| 0.3mm | Miniatures, gunpla, most base coats and shading | Very fast coverage on big surfaces | The default single airbrush |
| 0.35mm | Primer, metallics, base coats, soft edge camouflage | Extremely fine freehand lines | Scale modelers and army painters |
| 0.5mm and up | Terrain, large scale hulls, fast priming | Detail work of any kind | Second brush for volume work |
Note the overlap. A 0.35mm will pull a line fine enough for a shoulder pad, and a 0.3mm will spray primer, so nobody is locked out of anything by choosing between those two.
Why 0.3mm Is the Default
Because it sits at the point where the two failure modes cancel out. Small enough to control paint on a 28mm figure and pull a usable freehand line, large enough that ordinary hobby acrylic and most primers pass through without constant clogging. Nothing else in the range does both.
It is also the size with the widest spares availability, because it is what most brands fit as standard. That matters more than it sounds when a needle bends.
0.35mm Is Effectively the Same Decision
The difference between 0.3 and 0.35 is not something you will notice in the finish. It shows up slightly in how readily primer and metallic pigment pass through, in favor of the larger size. Treat them as one option and pick whichever the brush you like comes with.
When to Go Finer
Go to 0.2mm only if you already do freehand work at small scale and the 0.3 is genuinely holding you back. The finer nozzle rewards you with tighter lines and punishes you with faster tip dry, more clogging, and paint that has to be thinned further than feels comfortable.
Keep the 0.3 for primer if you do. Running primer through a 0.2 is the fastest route to a session spent cleaning instead of painting.
What Fine Nozzles Demand From Your Paint
Coarser pigments, metallics in particular, are the usual culprit when a small nozzle blocks. Straining paint and thinning further helps, but some paints simply have pigment too large for a 0.2mm opening. Our page on thinning acrylic paint covers consistency, and clogging covers what to do when it happens anyway.
When to Go Larger
A 0.5mm or larger nozzle makes sense for terrain boards, large scale armor, ship hulls and any situation where you are covering a lot of surface in one color. It lays paint down fast enough to keep a wet edge, and it will happily push thicker paint and heavier primers.
It is not a detail tool at all, so this is a second brush rather than a replacement for your main one.
Changing Nozzles Instead of Buying Brushes
Several brands sell nozzle and needle sets so one body can take more than one size, which is far cheaper than a second airbrush. Check before you buy whether your brush supports it, because it varies: some ranges share parts across models, others do not, and press fit nozzles behave differently from threaded ones.
A spare needle and nozzle in your usual size is worth keeping regardless, because a bent needle otherwise ends a painting session.
Handling Nozzles Without Breaking Them
Nozzles are small, thin and easy to crack by over tightening. Snug is enough. A cracked nozzle is one of the classic causes of bubbling in the cup and sputtering, and it is invisible without magnification. Our page on cleaning the nozzle covers safe handling and reamers.
Frequently Asked Questions
What nozzle size is best for miniatures? A 0.3mm, or 0.35mm if you also want to spray primer and metallics through the same brush. Both handle 28mm and 32mm figures comfortably, including glazes and zenithal work.
Is a smaller nozzle always better for detail? No. A smaller nozzle allows a finer line, but it also clogs faster and needs paint thinned further, so in real use a well handled 0.3 often out performs a poorly fed 0.2. Technique and thinning decide more than the number does.
Can I spray primer through a 0.2mm nozzle? Some thin airbrush primers will pass, but you are inviting clogs and tip dry. Most painters keep a larger nozzle or a second brush for primer and reserve the fine nozzle for detail.
Do I need to change the needle when I change the nozzle? Yes, always. The needle and nozzle are machined as a matched pair and mixing sizes leaves the brush unable to seal, which shows up as dripping and inconsistent flow.
What size do airbrush needles come in? The same sizes as the nozzles they pair with, commonly 0.2, 0.3, 0.35 and 0.5mm in the hobby range. Our page on needles and nozzles covers compatibility between brands.
My nozzle size is right but the finish is grainy. Why? Almost always pressure too high, paint too thick, or the brush held too far from the surface. All three make the paint start drying before it lands. Try moving closer and lowering pressure before you change hardware.
The Bottom Line
Nozzle size sets how much paint can pass and how fine a line you can pull, and for hobby work 0.3mm or 0.35mm covers nearly everything from priming to glazing. Add a 0.2mm only when fine freehand is genuinely your bottleneck, and a 0.5mm only when large surfaces are. Remember that the needle has to change with the nozzle, and that pressure and thinning influence your results more than the number on the box. Read next: choosing an airbrush for miniatures, and needles and nozzles for replacements and compatibility.