The spray nozzle is a key element of any paint sprayer – it determines the width of the spray and the amount of paint delivered to the surface. Understanding the markings on the nozzles allows you to select the right model for a specific task and achieve the best results.
What do the numbers on the nozzle mean?
Most spray nozzles feature three numbers. Each number conveys important information:
First digit – spray width
Multiply this number by 5to find out the approximate spray width from a distance of approximately 30 cm from the surface to be painted.
Example:
Nozzle marked as 529 – 5 × 5 = 25 cm stream width.
The last two digits are the nozzle orifice size.
This is the diameter of the hole in thousandths of an inch (1/1000 of an inch). The higher the number, the more paint flows through the nozzle.
Example:
Nozzle 529 - the hole has 0.029 inch, which means it works great for dense materials such as putties, plasters and other heavy mixtures.
Why does nozzle size matter?
Selecting the appropriate nozzle affects:
- Work efficiency – a nozzle that is too small will restrict paint flow and extend painting time.
- Quality of finish – a nozzle that is too large may cause streaks and excessive material consumption.
- Compatibility with the generator – a nozzle that is too large can overload the device, especially if it does not have enough pressure.
Examples of nozzle applications:
| Nozzle designation | Spray width | Hole size | Typical use |
| 311 | 15 cm | 0.011 inch | Stains, varnishes, impregnations |
| 415 | 20 cm | 0.015 inch | Acrylic and emulsion paints |
| 517 | 25 cm | 0.017 inch | Latex paints |
| 627 | 30 cm | 0.027 inch | Thick facade paints |
What do the letters on the nozzle mean?
In addition to numbers, many nozzles also have letter designations. These letters indicate the nozzle type and its application, design, or compatibility. Examples of STRONG-TECH nozzle types:
- FFLP – a low-pressure nozzle that ensures an ideal spray effect during finishing work. It's ideal for projects requiring the highest precision, such as carpentry and interior finishing. Thanks to its innovative design, the nozzle reduces the pressure required for proper paint atomization, which translates into lower material and airless pump consumption.
- XHD – Designed for spraying coatings with a high solids content at high pressure. Primarily for anti-corrosion and paint materials. It can operate at pressures up to 500 bar.
- FM6 – The FM6 STRONG reversible nozzle for airless paint sprayers. Highly versatile, depending on size, it can work with a variety of materials, from paints to plasters.
- FMLM – A nozzle specially cut for painting stripes on the roadway, meaning the applied line is clearly cut off at the edges. For airless painting of stripes and road markings using airless paint sprayers.
Summary
Knowing nozzle markings allows you to better match your equipment to the job at hand. It's not just about convenience, but also about efficiency, quality, and material savings. Always check that the nozzle you choose is compatible with your sprayer and the paint you plan to use.