Compare available ATC spindle configurations by tool holder, body diameter, power, speed, torque, electrical fit, and machining application before asking for a quote.
Platform range: 40+ configurations
Tool holders: BT30 / HSK40E
Body platforms: 100 mm / 125 mm
Power range: 3.0-7.5 kW
Speed range: 12000 / 18000 / 24000 RPM
Torque range: 3.2-7.6 Nm
Choose in Four Decisions, Not by Model Name Alone
Start with the machine and tool system, then use spindle parameters to remove unsuitable configurations before comparing individual model specifications.
01 Select the holder family
Use BT30 for broad ATC compatibility and cost control. Use HSK40E when precision, balance, and surface quality are the main requirement.
02 Match the body platform
100 mm covers 3.0 / 3.2 / 3.5 kW compact machines. 125 mm covers 5.5 / 7.5 kW work where the machine structure can carry the larger spindle.
03 Confirm the speed path
12000 RPM is the Basic BT30 baseline. 18000 / 24000 RPM paths support higher line speed, routing, finishing, and precision machining.
04 Check electrical and installation fit
Keep voltage, VFD capacity, pole count, rated frequency, cooling, compressed air, mounting diameter, and connector space in the same decision.
Model Directions from Available Spindle Platforms
These groups organize the available BT30 and HSK40E platforms by interface, body size, power, and speed.
Entry BT30 baseline
- Models available: Basic series
- Power range: 3.2 kW
- Speed range: 12000 RPM
- Torque range: 3.2 Nm
- Body platform: 100 mm
- Best fit: Cost-controlled CNC router projects that need a fixed 12000 RPM BT30 spindle path.
- Avoid when: The process needs 18000 / 24000 RPM finishing speed or a higher-power 125 mm body.
Balanced Model A BT30
- Models available: Model A BT30 series
- Best fit: General production routing, drilling, tapping, and compact-to-mid duty work where BT30 tooling is already planned.
- Avoid when: The workload needs the reinforced Model B direction or HSK40E toolholding.
Reinforced Model B BT30
- Models available: Model B BT30 series
- Best fit: BT30 projects that need the same tool family with a stronger selection direction than Model A.
- Avoid when: The machine is built around HSK40E holders or the process is surface-finish critical.
Precision Model C HSK40E
- Models available: Model C HSK40E series
- Best fit: High-speed finishing, precision contouring, and surface-critical machining where HSK40E tool retention matters.
- Avoid when: BT30-only tool magazines, budget-first retrofits, or machines that cannot support HSK40E holders.
Match the Spindle to the Machining Job
A CNC router spindle should be selected against the actual process: material, cutter size, tool-change system, runtime, and finish requirements.
General CNC router production
Recommended direction: BT30 100 mm Model A or Model B
Choose around the machine envelope first, then confirm whether 3.0 / 3.5 kW and 18000 / 24000 RPM match the cutter and material.
Do not move to 125 mm only because the power number is larger if the gantry, Z-axis, or duty cycle does not require it.
Drilling and tapping
Recommended direction: BT30 with the correct torque and speed path
Check tool holder compatibility, low-speed control behavior, VFD setup, and whether 12000 RPM or 18000 RPM is the real operating point.
Do not treat maximum RPM as the only target; stable torque and tool-change reliability matter more for repetitive holes.
Mold, aluminum, and 3C components
Recommended direction: 3.5 kW 100 mm or 5.5 kW 125 mm platforms
Use the higher platform when cutter engagement, runtime, and heat load justify the larger body and higher torque range.
Do not choose a compact 100 mm spindle for continuous heavy engagement just to preserve a smaller mount.
Precision surface finishing
Recommended direction: Model C HSK40E
Prioritize toolholding security, balance, runout control, and surface quality before comparing price.
Do not force HSK40E into a BT30-only automatic tool changer or an installation without matching holders.
Higher-load continuous cutting
Recommended direction: 125 mm 5.5 / 7.5 kW platforms
Confirm machine rigidity, cooling flow, VFD capacity, and whether 5.6 / 7.6 Nm torque is needed by the process.
Do not upgrade power without confirming Z-axis payload, mounting diameter, cable routing, and coolant capacity.
Parameter Logic: Read the Technical Data as a System
The safest choice comes from matching power, torque, speed, pole count, VFD setup, body size, and cooling together.
Power must be read with torque and duty cycle
Available spindle configurations span 3.0-7.5 kW, but power alone does not select the spindle. Cutter diameter, material, radial engagement, runtime, and heat load decide whether the compact 100 mm platform is enough or the 125 mm body is justified.
Torque separates light, general, and heavier work
The listed torque levels are 3.2, 4.0, 5.6, and 7.6 Nm. Treat 3.2 Nm as a compact light-to-general reference, 4.0 Nm as the stronger 100 mm path, and 5.6 / 7.6 Nm as the higher-power 125 mm direction.
Pole count and VFD frequency are not interchangeable
4P and 8P variants can have different rated speed, knee speed, and maximum frequency rules. Quote and commissioning should keep voltage, pole count, rated frequency, and maximum frequency together instead of only naming the spindle power.
Body diameter affects fit, rigidity, and cooling layout
The 100 mm body is the compact platform for 3.0 / 3.2 / 3.5 kW machines. The 125 mm body supports 5.5 / 7.5 kW work, but it also changes the mount, Z-axis load, coolant routing, and service space.
Shortlist the Right Side of Each Decision
Review the table before comparing individual model specifications. It prevents common mis-matches such as choosing only by power or reusing a VFD without checking frequency.
| Decision | Option A | Option B |
|---|---|---|
| Tool holder | BT30: broad automatic tool change compatibility and practical cost control. | HSK40E: precision-oriented holder path for surface quality and high-speed stability. |
| Body platform | 100 mm: compact 3.0 / 3.2 / 3.5 kW machines and lighter Z-axis envelopes. | 125 mm: 5.5 / 7.5 kW direction for higher load and stronger torque requirements. |
| Power class | 3.0 / 3.2 / 3.5 kW: compact router, drilling, tapping, and moderate machining. | 5.5 / 7.5 kW: higher-load production when the machine structure can support it. |
| Speed path | 12000 RPM: Basic BT30 baseline for cost-controlled general work. | 18000 / 24000 RPM: higher line speed for routing, finishing, and precision machining. |
| Electrical check | 220V / 380V must be confirmed with the exact VFD, current, pole count, and frequency range. | Do not reuse an existing VFD until the rated and maximum frequency requirements are checked. |
Quote Checklist: Before You Compare Prices
A correct ATC spindle quote depends on the machine interface, electrical cabinet, air supply, cooling setup, tooling system, and machining workload. These details help narrow the exact voltage, pole count, speed path, and platform.
- Automatic tool changer type and holder family
- Required spindle body diameter and available Z-axis space
- Target material, cutter diameter, and cutting duty cycle
- Power, torque, and speed path required by the process
- Voltage, VFD capacity, pole count, and frequency range
- Cooling loop, coolant routing, and operating temperature control
- Compressed air supply for tool release and taper cleaning
- Mounting dimensions, cable exit, connector orientation, and service space
Ready to Choose the Right ATC Spindle?
Use holder family, body size, speed range, voltage, cooling, and material targets to narrow the real BT30 or HSK40E buying path. Request a fit-checked spindle quote or browse ATC spindle configurations. See also: BT30 vs HSK40E buying paths.