Angular Contact Ceramic Ball Bearing H7003C-2RZ HQ1

The H7003C-2RZ HQ1 is an ultra-precision hybrid angular contact ball bearing engineered for extreme high-speed machinery where rotational accuracy and thermal stability are critical. By combining premium high-carbon chrome steel rings with aerospace-grade Silicon Nitride (Si3N4) ceramic balls, this bearing achieves a staggering grease-lubricated limiting speed of 73,800 RPM. The 17mm bore and 35mm outside diameter make it the standard choice for high-frequency electric spindles, dental handpieces, and micro-machining centers. Ceramic balls are 40% less dense than steel, which virtually eliminates centrifugal ball loading and drastically reduces internal heat generation at extreme velocities. Certified to P4/HQ1 precision standards, this 40-gram bearing offers the ultimate combination of speed, durability, and electrical insulation.

Hybrid Silicon Nitride (Si3N4) Ball technology
17mm Bore x 35mm OD x 10mm Width
Extreme High-speed Limiting (73,800 RPM)
Precision P4 Grade for industrial accuracy
5.2 KN Basic Dynamic Load capacity
Lightweight 0.04 kg architecture

⚡ 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: 0.04 kg \| sealingType: 2RZ (Non-contact) \| precisionClass: P4 / HQ1
INSIDE DIAMETER	17 mm
OUTSIDE DIAMETER	35 mm
WIDTH DIMENSION	10 mm
MAX SPEED GREASE	73800 RPM
BASIC LOAD RATING CR	5.2 KN
BASIC LOAD RATING COR	2.5 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
Ultra-High Frequency CNC Spindles	Precision Tool Manufacturing
Precision Dental and Medical Handpieces	Medical and Dental Technology
High-Speed Micro-Routing and Engraving	Aerospace and Defense Engineering
Turbochargers and High-RPM Fans	Electronics and PCB Industries
Advanced Laboratory Centrifuges	Research and High-Speed Science
Optical and Electronic Testing Equipment	General Engineering

Technical FAQ & Operational Guide

Can this bearing really reach 73,800 RPM?

Yes, the H7003C-2RZ HQ1 is specifically designed for ultra-high speeds. Its ceramic balls and precision P4 construction allow it to reach a limiting speed of 73,800 RPM with grease lubrication.

What is the benefit of the '2RZ' seal?

The 2RZ seal is a non-contact rubber seal. It provides excellent protection against dust and contaminants while creating zero frictional resistance, which is essential for achieving ultra-high RPMs.

Why use ceramic balls in a 17mm bearing?

In micro-bearings rotating at extreme speeds, centrifugal force causes steel balls to press against the outer raceway, creating heat. Ceramic balls are much lighter, reducing this force and allowing the bearing to run cooler and faster.

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 H7003C-2RZ HQ1

Hybrid Silicon Nitride (Si3N4) Ball technology

17mm Bore x 35mm OD x 10mm Width

Extreme High-speed Limiting (73,800 RPM)

Precision P4 Grade for industrial accuracy

5.2 KN Basic Dynamic Load capacity

Lightweight 0.04 kg architecture

⚡ 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: 0.04 kg | sealingType: 2RZ (Non-contact) | precisionClass: P4 / HQ1

INSIDE DIAMETER

17 mm

OUTSIDE DIAMETER

35 mm

WIDTH DIMENSION

10 mm

MAX SPEED GREASE

73800 RPM

BASIC LOAD RATING CR

5.2 KN

BASIC LOAD RATING COR

2.5 KN

BEARING TYPE

Angular Contact Hybrid Ceramic

BALL MATERIAL

Silicon Nitride (Si3N4)

RING MATERIAL

High-Carbon Chrome Steel (GCR15)

Usage Scenario

Target Industry

Ultra-High Frequency CNC Spindles

Precision Tool Manufacturing

Precision Dental and Medical Handpieces

Medical and Dental Technology

High-Speed Micro-Routing and Engraving

Aerospace and Defense Engineering

Turbochargers and High-RPM Fans

Electronics and PCB Industries

Advanced Laboratory Centrifuges

Research and High-Speed Science

Optical and Electronic Testing Equipment

General Engineering