Product Overview

The NMT 7006 CD/HCP4A is a high-capacity hybrid ceramic single-row angular contact ball bearing with a 30 mm bore, 55 mm outer diameter, and 13 mm width. Featuring a 15° contact angle (CD type) combined with a high-capacity D-type design, this bearing delivers the highest load capacity within the 7006 series compact envelope while maintaining exceptional high-speed performance. It stands as the strongest non-matchable single-row bearing in the NMT 7006 product line, ideal for space-constrained applications with demanding load requirements.

 

With a basic dynamic load rating of 14.3 kN and static load rating of 8.0 kN, this bearing outperforms most competitors in its size class. Paired with hybrid ceramic rolling elements (silicon nitride Si₃N₄) and P4A super-precision tolerance, it achieves a maximum speed of 56,000 r/min under oil-air lubrication and 38,000 r/min with grease lubrication – perfectly balancing heavy-load and high-speed demands.

 

Model Code Decoding – Understanding NMT 7006 CD/HCP4A

Code Meaning

7006 Basic series designation, 30 mm bore, 13 mm width compact design

CD 15° contact angle design – lower axial capacity than 25° but offers higher limiting speed and lower heat generation, ideal for ultra-high-speed operation

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

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

No G/GA suffix Non-universal matchable single bearing – this is an individual single-row design, not for universal pairing. For duplex/triplex sets, order dedicated matched pairs (DT/DB/DF)

Key Comparison: Unlike the 7006 ACEGA/HCP4AL1 (E-type high-speed design, Class A preload, universal matchable), the 7006 CD/HCP4A adopts D-type high-capacity design + 15° small contact angle, delivering significantly higher load capacity (14.3 kN vs 8.84 kN) in a non-paired single-bearing application – the ultimate choice for "small size, big load."

 

Core Performance Advantages

1. D-Type High-Capacity Design – Maximum Load in Minimum Space

By optimizing rolling element diameter and count, the D-type design achieves 14.3 kN dynamic and 8.0 kN static load ratings within a compact 13 mm width – over 30% higher capacity than standard designs – easily handling heavy cutting forces and high feed rates.

 

2. 15° Contact Angle – Ideal for Ultra-High Speeds

The 15° contact angle generates lower axial force components and less frictional heat, resulting in significantly lower temperature rise than 25° contact angle designs at equivalent speeds. With oil-air lubrication, limiting speed reaches 56,000 r/min – perfect for high-speed electric spindles and PCB drilling machines.

 

3. Hybrid Ceramic Technology – Speed and Durability Combined

Silicon nitride ceramic balls feature lower density (60% of steel), lower thermal expansion, and higher elastic modulus – significantly reducing centrifugal forces and frictional heat at high speeds while improving seizure resistance and lubrication-starvation tolerance, extending maintenance intervals.

 

4. P4A Super-Precision Grade – Micron-Level Accuracy

The P4A tolerance class guarantees minimal radial runout and axial play, meeting stringent surface quality and dimensional consistency requirements in precision machining.

 

5. Ultra-Lightweight and Sustainable

Each bearing weighs only 0.093 kg with a carbon footprint of just 0.34 kg CO₂e – one of the lightest in its class, contributing to reduced spindle inertia and energy consumption.

 

6. Clear Speed Performance Data

NMT provides definitive speed ratings for both lubrication methods:

 

Grease lubrication: 38,000 r/min

 

Oil-air lubrication: 56,000 r/min

Enabling direct selection without additional validation testing.

 

Typical Applications

The NMT 7006 CD/HCP4A is ideal for precision equipment demanding compactness, load capacity, and high speed simultaneously:

 

High-Speed Electric Spindles – micro-machining, high-gloss milling, and mold engraving spindles

 

PCB Drilling Machines – high-speed, high-frequency start-stop drilling spindles

 

CNC Engraving/Milling Machines – precision machining balancing speed and cutting force

 

Optical Component Manufacturing Equipment – high-surface-quality grinding/polishing spindles

 

Small Precision Grinding Machines – internal/external grinding wheel spindles

 

High-Speed Centrifugal Compressors/Fans – small turbomachinery rotor supports

 

Installation and Selection Important Notes

⚠️ This is a non-universal matchable single bearing (no G or GA suffix in the designation). For paired configurations (DB back-to-back, DF face-to-face, DT tandem) , please order the corresponding pre-matched set (e.g., 7006 CD/HCP4ADB, 7006 CD/HCP4ADF, 7006 CD/HCP4ADT) with factory end-face grinding.

 

✅ For single-bearing applications, ensure proper shaft/housing fit and locking methods to achieve correct internal clearance and contact stiffness.

 

✅ To achieve the 56,000 r/min limiting speed, direct oil-air lubrication is mandatory – ensure adequate oil-air flow rate and heat dissipation conditions.

 

✅ Heat mounting (80–100°C) is recommended for installation – avoid impact loads on rolling elements.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies stringent Japanese quality standards to every 7006 CD/HCP4A bearing – from ring material (high-purity bearing steel), ceramic balls (HIP silicon nitride), to superfinishing processes. Each bearing undergoes full-parameter inspection including dimensional accuracy, running accuracy, and vibration levels before shipment, ensuring stable and reliable performance in your equipment.

 

Choose NMT 7006 CD/HCP4A for:

 

✅ D-type high-capacity design – highest load in its size class

 

✅ 15° contact angle ultra-high-speed performance

 

✅ Hybrid ceramic technology – speed and durability together

 

✅ P4A super-precision running accuracy

 

✅ Clear speed performance data

 

✅ Ultra-lightweight green design

 

✅ Japanese precision manufacturing quality