CNC Turned Brass Spray Nozzles
Spray nozzles turned from CW614N brass, with an internal taper held to ±0.5°, an orifice drilled from 0.3 to 4.0 mm and held to ±0.02 mm, concentric to the thread axis within 0.02 mm, threads cut to 6g and flow tested to ±5 % of nominal at 3 bar. Orifices are deburred by controlled tumbling so the edge stays sharp enough to form a clean jet.
- Orifice Drilled From 0.3 mm
- Taper Bore Concentric 0.02 mm
- Threads Gauged 6g
- Flow Tested per Batch
*Send the flow rate at a stated pressure and the spray angle. The orifice size is calculated from those two numbers, and a nozzle copied from a sample will only match at one pressure.
Brass Spray Nozzle Overview
A nozzle converts pressure into a pattern, and it does that with two features: the internal taper and the orifice. The taper sets the angle, the orifice sets the flow and the edge quality of the orifice decides whether the pattern is clean or streaky.
The body is turned complete, the taper is bored and the orifice is drilled last from the outside in, so the breakthrough burr is pushed into the taper where it can be removed. Parts are flow tested as a batch, and the orifice is checked with a pin gauge before plating.
CW614N Free-Cutting Brass
CW614N machines fast and holds a fine orifice without tearing, which is why most small nozzles are brass. It also takes nickel plating well, so the same body can be supplied for water, coolant or mild chemical sprays.
316L Stainless or POM
316L is used for nozzles in food, pharmaceutical and chloride duty, where brass would dezincify. POM is chosen for air and low-pressure water where a metal nozzle would damage the surface being sprayed.
Brass is the default below 80 °C and for neutral water; stainless is the choice wherever the spray touches food, chloride or a cleaning chemical.
Brass Spray Nozzle Specifications
Turning data for spray nozzles, with the orifice, taper and flow values that define the pattern.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Spray Nozzle / Fan and Cone Nozzle | Machining Process | CNC Turning, Micro-Drilling, Tapping |
| Material | CW614N Brass Bar | Body Diameter | Ø 6 – 40 mm |
| Orifice | Ø 0.3 – 4.0 mm, ±0.02 mm | Internal Taper | Included Angle ±0.5° |
| Concentricity | 0.02 mm Orifice to Thread Axis | Thread | M5 – M20 or BSP, 6g, Gauged |
| Flow Rate | ±5 % of Nominal at 3 bar | Spray Angle | ±3° at Nominal Pressure |
| Surface Finish | Ra 0.8 µm Inside the Taper | Hex or Knurl | Across Flats ±0.05 mm |
| Customization | Filter Screen, Swirl Insert, Nickel Plating | Lead Time | 5 – 7 Days Sample, 10 – 14 Days Batch |
| Inspection | Pin Gauge Orifice, Flow Bench per Batch, Thread Gauges, Spray Pattern Check | Packing | Individually Bagged, Orifice Protected, Carton |
Key Features of Our Brass Nozzles
Orifice last, flow tested as a batch.
Orifice Drilled After the Taper
Drilling last means the breakthrough burr is inside the taper where it can be removed, leaving a clean edge that forms a stable jet.
Taper Bored to ±0.5°
The included angle is bored and checked with a taper gauge, because half a degree changes the spray width by 10 % at one metre.
Flow Tested at 3 bar
Every batch is flow tested and the rate held to ±5 % of nominal, so a replacement nozzle matches the one it replaces.
Thread Concentric to the Orifice
The thread is cut from the same set-up as the bore, holding concentricity to 0.02 mm so the nozzle seats straight in the manifold.
Nozzle that has to match a flow rate?
Surface Finishes for Brass Nozzles
The orifice and taper are functional surfaces; plating is for corrosion and appearance.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Nickel Plating | Corrosion resistance in water and coolant sprays | Ultrasonic Clean | Removes drilling swarf from the taper |
| Passivation | Removes free iron picked up from tooling | Masked Orifice | Keeps the drilled diameter after plating |
| Tumble Deburr | Breaks the orifice edge without rounding it | Laser Marking | Flow rate and spray angle on the body |
*Nickel plating adds 5 to 8 µm and will close a 0.3 mm orifice. Small orifices are plugged before plating, or the nozzle is plated and the orifice re-drilled to size.
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Turning Process for Brass Nozzles
The orifice is drilled after the taper is turned, so the jet leaves a clean edge instead of a burr that splits the spray pattern.
01. Flow and Pattern Review
Calculate the orifice from the required flow at the stated pressure, confirm the spray angle and check the thread size against the manifold.
02. Turn the Body
Turn the outside, the hex and the thread in one operation, then bore the internal taper and check the angle with a taper gauge.
03. Drill the Orifice
Drill the orifice from the outside in with a micro-drill and peck cycle, then ream where the tolerance is tighter than ±0.02 mm.
04. Deburr and Clean
Tumble deburr to break the orifice edge without rounding it, then ultrasonically clean the taper and blow dry before inspection.
05. Flow Test and Pack
Flow test a sample from every batch at 3 bar, check the pattern visually, then bag each nozzle with the orifice protected.
Send the flow rate at your working pressure and the spray angle, and we will quote nozzles with the orifice matched and flow tested.
Brass Spray Nozzle FAQs
0.3 mm in brass with a carbide micro-drill and a peck cycle. Below that the drill breaks too often and the part is better made as a laser-drilled insert.
Yes, that is the better way to specify. We calculate the orifice from the flow at your pressure, then flow test the batch and adjust the drill size if the average is outside ±5 %.
It reduces the orifice by 10 to 16 µm on diameter, which matters below 0.8 mm. Small nozzles are plugged before plating or re-drilled afterwards.
±3° at nominal pressure, measured on a pattern card at 300 mm. The angle also depends on pressure, so the test pressure is stated on the report.
By controlled tumbling rather than hand deburring. Hand work rounds one side more than the other and the jet deflects; tumbling removes the burr evenly.
Yes, a stainless screen from 40 to 200 mesh is pressed into the inlet, and the body is counterbored to suit so the screen does not reduce the flow area.
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