Angular Contact Ceramic Ball Bearing 7205C-2RZ HQ1

The 7205C-2RZ HQ1 is a premium hybrid angular contact ball bearing engineered for high-performance industrial systems requiring extreme durability and speed. By pairing precision-ground steel rings with aerospace-grade Silicon Nitride (Si3N4) ceramic balls, this bearing achieves a grease-lubricated limiting speed of 30,000 RPM. The 25mm bore and 52mm outside diameter, combined with an 18mm width, provide a robust dynamic load rating of 16.7 KN. Ceramic balls are significantly lighter and harder than steel, which reduces internal heat generation and centrifugal forces at high velocities. This P4 precision grade bearing is the ideal choice for high-speed CNC spindles, aerospace components, and automotive performance engineering where thermal stability, reduced noise, and extended service life are critical requirements.

Hybrid Silicon Nitride (Si3N4) Ball technology
25mm Bore x 52mm OD x 18mm Width
High-speed limiting speed (30,000 RPM)
P4 Grade precision for machining excellence
16.7 KN Basic Dynamic Load rating
High-efficiency 2RZ non-contact shielding

⚡ Quick Technical Datasheet:

Power OutputN/A

Max SpeedN/A

Voltage RatingN/A

Collet InterfaceER Standard

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Comparative Technical Spindle Motor Configurations Matrix

Use the structural data catalog matrix below to evaluate power outputs, maximum RPM, operating voltages, and cooling styles across standard TriQuench CNC spindle models.

Spindle Capacity	Operating Speed	Operating Voltage	Cooling System
12.0 kW	18,000 RPM	380 V	Water-Cooled
0.8 kW	24,000 RPM	220 V	Air-Cooled (Long Shaft)
3.7 kW	40,000 RPM	380 V	Water-Cooled ISO20
9.0 kW	18,000 RPM	380 V	Air-Cooled

Technical Specifications

Technical Parameter	Engineering Specification Value
MECHANICAL	weight: approx 0.135 kg \| sealingType: 2RZ (Non-contact) \| precisionClass: P4 / HQ1
INSIDE DIAMETER	25 mm
OUTSIDE DIAMETER	52 mm
WIDTH DIMENSION	18 mm
MAX SPEED GREASE	30000 RPM
BASIC LOAD RATING CR	16.7 KN
BASIC LOAD RATING COR	10.3 KN
BEARING TYPE	Angular Contact Hybrid Ceramic
BALL MATERIAL	Silicon Nitride (Si3N4)
RING MATERIAL	High-Carbon Chrome Steel (GCR15)

Industrial Applications

Usage Scenario	Target Industry
High-Speed Industrial CNC Spindles	Industrial Automation and Manufacturing
Precision Aerospace Rotating Components	Aerospace and Defense Engineering
Performance Automotive Powertrains	Automotive and Motorsport Engineering
High-Frequency Motors and Pumps	Medical Device Manufacturing
Medical Technology and Laboratory Equipment	General High-Precision Engineering
Advanced Robotics and Positioning Systems	General Engineering

Technical FAQ & Operational Guide

What is the limiting speed of the 7205C-2RZ HQ1?

This hybrid ceramic bearing is rated for a limiting speed of up to 30,000 RPM when used with high-speed grease lubrication.

How does the ceramic ball improve durability?

Ceramic balls (Si3N4) are harder than steel, naturally resistant to corrosion, and generate 40% less friction-induced heat. This prevents thermal fatigue and wear, significantly extending the life of the bearing in demanding applications.

Does this bearing provide electrical insulation?

Yes. Ceramic balls are electrical insulators, making this bearing an excellent choice for electric motors and spindles where stray currents can cause electrical erosion in standard steel bearings.

How is the rotational balancing calibrated on this spindle motor?

Every spindle motor is dynamically balanced in accordance with the ISO 1940 balancing standard to guarantee vibration-free running and maximum stability at high RPMs.

What are the runout tolerances of the shaft and collet interface?

The internal shaft taper maintains a runout accuracy tolerance of under 0.003mm (3 microns), maintaining precise tool concentricity and preventing premature cutter wear.

What cooling precautions are built-in to prevent heat exhaustion?

Built-in temperature dissipation channels support continuous water/liquid cooling circulation or forced fan airflow, preventing thermal expansion of components.

Is this spindle motor compatible with standard VFD inverters and collets?

Yes, the spindle supports direct electrical integration with standard variable frequency drives (VFD) and accepts industrial ER collets (ER11, ER20, ER25, or ER32) to match standard toolholder dimensions.

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Angular Contact Ceramic Ball Bearing 7205C-2RZ HQ1

Hybrid Silicon Nitride (Si3N4) Ball technology

25mm Bore x 52mm OD x 18mm Width

High-speed limiting speed (30,000 RPM)

P4 Grade precision for machining excellence

16.7 KN Basic Dynamic Load rating

High-efficiency 2RZ non-contact shielding

⚡ Quick Technical Datasheet:

Power OutputN/A

Max SpeedN/A

Voltage RatingN/A

Collet InterfaceER Standard

Comparative Technical Spindle Motor Configurations Matrix

Use the structural data catalog matrix below to evaluate power outputs, maximum RPM, operating voltages, and cooling styles across standard TriQuench CNC spindle models.

Spindle Capacity	Operating Speed	Operating Voltage	Cooling System
12.0 kW	18,000 RPM	380 V	Water-Cooled
0.8 kW	24,000 RPM	220 V	Air-Cooled (Long Shaft)
3.7 kW	40,000 RPM	380 V	Water-Cooled ISO20
9.0 kW	18,000 RPM	380 V	Air-Cooled

Technical Parameter

Engineering Specification Value

MECHANICAL

weight: approx 0.135 kg | sealingType: 2RZ (Non-contact) | precisionClass: P4 / HQ1

INSIDE DIAMETER

25 mm

OUTSIDE DIAMETER

52 mm

WIDTH DIMENSION

18 mm

MAX SPEED GREASE

30000 RPM

BASIC LOAD RATING CR

16.7 KN

BASIC LOAD RATING COR

10.3 KN

BEARING TYPE

Angular Contact Hybrid Ceramic

BALL MATERIAL

Silicon Nitride (Si3N4)

RING MATERIAL

High-Carbon Chrome Steel (GCR15)

Usage Scenario

Target Industry

High-Speed Industrial CNC Spindles

Industrial Automation and Manufacturing

Precision Aerospace Rotating Components

Aerospace and Defense Engineering

Performance Automotive Powertrains

Automotive and Motorsport Engineering

High-Frequency Motors and Pumps

Medical Device Manufacturing

Medical Technology and Laboratory Equipment

General High-Precision Engineering

Advanced Robotics and Positioning Systems

General Engineering