STZ Water Cooled Spindle Motor 0.8-2.2 KW ER11 ER20
Overview
STZ series water cooled spindle motors are round-body, liquid-cooled units for CNC routers, engraving machines and woodworking centres that run long shifts. Water cooling keeps the stator temperature stable at low spindle speeds and makes them noticeably quieter than air cooled versions. The range covers 0.8 kW to 2.2 kW in 65 mm and 80 mm bodies, with ER11 and ER20 collets, 400 Hz and 24 000 rpm rated speed.
Model range
| Model | Power | Voltage | Rated current | Collet |
|---|---|---|---|---|
| STZ65-0.8-ER11-220V | 0.8 kW | 220 V | 3.5 A | ER11 |
| STZ80-1.5-ER11-110V | 1.5 kW | 110 V | 9.0 A | ER11 |
| STZ80-1.5-ER11-220V | 1.5 kW | 220 V | 6.0 A | ER11 |
| STZ80-2.2-ER20-110V | 2.2 kW | 110 V | 14.0 A | ER20 |
| STZ80-2.2-ER20-220V | 2.2 kW | 220 V | 8.0 A | ER20 |
Common specifications
| Item | Value |
|---|---|
| Rated speed | 24 000 rpm |
| Rated frequency | 400 Hz |
| Cooling | Water cooled, inlet/outlet ports on the rear cap |
| Bearings | 0.8–1.5 kW: 7002DT pair + 6002; 2.2 kW: 7005DT pair |
| Body diameter | Ø65 mm (0.8 kW), Ø80 mm (1.5–2.2 kW) |
| Collet nut | M14 × 0.75 (ER11), M25 × 1.5 (ER20) |
| Connection | Aviation plug power connector, separate water ports |
How to choose
- Power follows material and depth of cut. 0.8 kW suits light engraving and plastics; 1.5 kW covers most wood and acrylic routing; 2.2 kW is for hard wood and aluminium with small depths of cut.
- Collet size limits tool shank. ER11 tops out around 7 mm shank, ER20 around 13 mm - going to 2.2 kW usually means ER20 tooling.
- Voltage must match your VFD and site. 110 V models draw roughly 1.75× the current of the 220 V version at the same power; check your breaker and cable size.
- Plan the cooling loop. A pump, radiator and flow switch are required; running a water cooled spindle dry will destroy the bearings within minutes.
Typical applications
- CNC routers cutting MDF, plywood and hard wood
- Acrylic and plastic engraving where noise matters
- Aluminium signage with light depth of cut
- Long-run production cells that cannot tolerate thermal drift
FAQ
Can a water cooled spindle run dry for a short test?
No. Connect the cooling loop before the first start; the front bearings are grease-lubricated but the stator heat path depends on the water jacket.
Which VFD should I use?
Any VFD rated for the spindle current at 400 Hz - for example our 2.2 kW 220 V model for STZ80-2.2-ER20-220V.
What is the difference between 110 V and 220 V versions?
Same mechanical output, different winding: 110 V units draw about 1.75× the current, so cables and breakers must be sized accordingly.
Do you supply the pump and hoses?
Cooling kits are available as an option - tell us your loop length and we will match the pump.
Related products
Pair with our VFDs, ER collets and air cooled spindles.
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