Product Overview

The NMT 7006 ACEGA/HCP4AL1 is an ultra-high speed hybrid ceramic single-row angular contact ball bearing featuring a 30 mm bore, 55 mm outer diameter, 13 mm width, and a 25° contact angle (AC) . Engineered for extreme rotational speeds and minimal heat generation, this bearing incorporates a high-speed E-type design combined with silicon nitride (Si₃N₄) ceramic rolling elements and a lightweight construction to minimize centrifugal forces and frictional heat during high-speed operation.

 

With a basic dynamic load rating of 8.84 kN and static load rating of 5 kN, it delivers ample load capacity within an ultra-lightweight package (net weight only 0.107 kg). The P4A super-precision tolerance class, paired with Class A measured load preload, ensures stable contact stiffness and ultra-low vibration levels. The bearing is specifically optimized for direct oil-air lubrication systems, enabling higher limiting speeds and extended maintenance intervals.

 

Model Code Decoding – Understanding NMT 7006 ACEGA/HCP4AL1

Code Meaning

7006 Basic series designation, 30 mm bore, compact lightweight design

AC Angular contact design with 25° contact angle

E High-speed E-type design – optimized ball size and cage geometry for lower heat generation and higher limiting speeds

G Single bearing (not a pre-assembled set)

A Universal matchable with Class A preload (measured load level A) – supports back-to-back (<>), face-to-face (><), or tandem (>>) configurations

HC Hybrid ceramic – rolling elements made of bearing-grade silicon nitride (Si₃N₄)

P4A Super-precision tolerance class – dimensional accuracy P4, running accuracy exceeding P4

L1 Light preload level 1 – a low-preload setting further optimized on top of Class A measured load, minimizing high-speed heat generation

Core Synergy: E-type design + HC ceramic balls + L1 light preload – these three elements together form the technological triangle that empowers the NMT 7006 ACEGA/HCP4AL1 for ultra-high-speed dominance.

 

Core Performance Advantages

1. High-Speed E-Type Design – Engineered for Speed Limits

The E-type design optimizes ball diameter, ball count, and cage guidance, significantly reducing sliding friction and churning losses at high speeds, enabling the bearing to maintain low temperature rise and high stability at speeds far beyond conventional steel bearings.

 

2. Hybrid Ceramic Technology – 40% Centrifugal Force Reduction

Silicon nitride ceramic balls have only 60% the density of bearing steel, drastically reducing centrifugal forces at equivalent speeds. Ceramic materials also offer lower thermal expansion coefficients and higher elastic modulus, effectively suppressing geometric deformation at high speeds and enhancing spindle accuracy retention.

 

3. Class A + L1 Light Preload – The Perfect Balance of Stiffness and Temperature

Class A matching preload combined with L1 light preload provides "just enough" contact stiffness – avoiding excessive heat from over-preloading while eliminating vibration and noise from under-preloading. This balance is the key to ultra-high-speed stable operation.

 

4. Oil-Air Lubrication Ready – Breaking the Speed Barrier

The cage and internal geometry of this bearing are specifically optimized for direct oil-air lubrication. The oil-air mixture efficiently reaches rolling contact zones, removing heat and providing a stable oil film, pushing limiting speeds 15–20% higher than conventional oil-mist lubrication.

 

5. Ultra-Lightweight and Sustainable

With a net weight of only 0.107 kg and a carbon footprint of just 0.4 kg CO₂e, this is one of the lightest members of the 7000 series – ideal for rotating-mass-sensitive applications in aerospace, precision instruments, and beyond.

 

6. Universal Matchable Design – Flexible Configurations

The GA suffix signifies universal matchable capability, allowing free selection of back-to-back, face-to-face, or tandem arrangements based on actual load directions and space constraints, without the need for selective shimming.

 

Typical Applications

The NMT 7006 ACEGA/HCP4AL1 is engineered for cutting-edge applications demanding ultimate speed and precision:

 

High-Speed Electric Spindles – PCB drilling, micro-milling, and high-gloss finishing spindles

 

Dental/Medical Hand Tools – high-speed dental drills and surgical power systems

 

Aerospace Precision Machining – high-speed milling spindles for titanium and composite materials

 

Optical Precision Instruments – high-speed rotating scanning mirrors and gyroscopes

 

Semiconductor Manufacturing Equipment – wafer dicing spindles and high-speed scribers

 

Small High-Speed Motors/Generators – micro-turbines and high-speed permanent magnet motors

 

Installation and Usage Recommendations

✅ This bearing is universally matchable (GA) for flexible combination. For paired installations, using bearings from the same production batch is recommended to ensure preload consistency.

 

✅ Direct oil-air lubrication is strongly recommended to achieve peak performance. Please consult NMT technical team for specific oil-air ratios and flow rates.

 

✅ Maximum limiting speed depends on lubrication method, installed preload, and heat dissipation conditions. Contact NMT engineers for application-specific speed recommendations.

 

⚠️ Hybrid ceramic bearings are more sensitive to installation shock. Heat mounting or hydraulic installation methods are recommended – avoid impact on raceways or rolling elements.

 

NMT Quality Commitment

Japan NMT (Enmutī) has deep technological expertise in ultra-high-speed precision bearings. The 7006 ACEGA/HCP4AL1 undergoes precision control and full inspection at every stage – from material selection (high-purity bearing steel rings + HIP silicon nitride ceramic balls), cage design (lightweight high-strength phenolic resin), to final matching preload (Class A + L1 light preload) – ensuring every bearing delivers stable performance under extreme operating conditions.

 

Choose NMT 7006 ACEGA/HCP4AL1 for:

 

✅ High-speed E-type design pushing speed limits

 

✅ Hybrid ceramic technology for low temperature rise

 

✅ Class A + L1 precision light preload

 

✅ Oil-air lubrication optimization

 

✅ P4A super-precision running accuracy

 

✅ Universal matchable flexible configurations

 

✅ Ultra-lightweight green design