Product Overview

The NMT 7010 ACE/HCP4AL1DT is a pre-assembled duplex tandem matched (DT) super-precision hybrid ceramic angular contact ball bearing set, comprising 2 rows of bearings precision-paired in a tandem (<<) configuration. With a total width of 32 mm (16 mm per row × 2), a 50 mm bore, and an 80 mm outer diameter, this set features a 25° contact angle, high-speed E-type design, silicon nitride (Si₃N₄) hybrid ceramic rolling elements, a lightweight phenolic resin cage, and factory-preset L1 light preload, specifically optimized for ultra-high-speed rotational applications dominated by heavy unidirectional axial loads.

 

The bearing set offers a radial dynamic load rating of 24.2 kN (5,445 lbf) and a radial static load rating of 20.0 kN (4,500 lbf) . The DT tandem arrangement means both bearings share the same contact angle orientation, with axial loads shared equally across both rows, delivering doubled unidirectional axial load capacity. Manufactured to P4A super-precision tolerance class with L1 light preload, the set achieves a limiting speed of 46,000 r/min under oil-air lubrication.

 

Model Code Decoding – Understanding NMT 7010 ACE/HCP4AL1DT

Code Meaning

7010 Basic series designation, 50 mm bore, 80 mm OD

AC Angular contact design with 25° contact angle

E High-speed E-type design – higher speed capability and heavier load capacity than equivalent B-type high-speed bearings

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

P4A Super-precision tolerance class – dimensional accuracy to ISO P4 class (ABEC 7), running accuracy superior to P4

L1 Light preload – optimal stiffness with minimal high-speed friction and heat generation

DT Duplex Tandem – 2 bearings mounted in the same direction (<<) , doubling unidirectional axial load capacity

Core Value: The DT tandem arrangement means both bearings share the same contact angle orientation, with axial loads shared equally across both rows, enabling extreme unidirectional thrust capacity. HC hybrid ceramic technology drastically reduces centrifugal forces and frictional heat at high speeds. L1 light preload eliminates internal clearance, ensuring precise shaft positioning and minimal deflection. E-type high-speed design offers higher speed capability and heavier load capacity than equivalent B-type designs – these four elements work together to make this bearing set the ultimate solution for heavy-load unidirectional ultra-high-speed spindles.

 

Core Performance Advantages

1. Tandem (DT) Arrangement – Doubled Unidirectional Axial Capacity

With both rows oriented identically, axial load capacity increases by nearly 100% compared to a single bearing. With 24.2 kN (5,445 lbf) radial dynamic rating and 20.0 kN (4,500 lbf) radial static rating, this set is ideal for heavy-cutting lathe spindles, powerful drilling spindles, and other unidirectional thrust applications.

 

2. 25° Contact Angle + High-Speed E-Type Design – Ultra-High Speed and Heavy Load Combined

The 25° contact angle delivers superior axial rigidity and radial load capacity. The E-type high-speed design offers higher speed capability and heavier load capacity than equivalent B-type high-speed bearings. Combined with hybrid ceramic rolling elements and a phenolic resin cage, the set achieves a limiting speed of 46,000 r/min under oil-air lubrication.

 

3. Hybrid Ceramic Technology – A Leap in High-Speed Performance

Silicon nitride (Si₃N₄) ceramic balls have only 60% the density of bearing steel, drastically reducing centrifugal forces and frictional heat at high speeds. Ceramic materials also offer lower thermal expansion coefficients and higher elastic modulus, effectively suppressing geometric deformation at high speeds while improving seizure resistance and lubrication-starvation tolerance.

 

4. L1 Light Preload – Ideal for High-Speed Precision Applications

L1 light preload provides precise internal contact stiffness for high-speed spindles – eliminating internal clearance, ensuring precise shaft positioning and minimal deflection, while avoiding excessive temperature rise from over-preloading, ensuring stable temperature performance even at 46,000 r/min limiting speeds.

 

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

The P4A tolerance class guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004mm to 0, meeting stringent surface quality and dimensional consistency requirements. Operating temperature range is -30°C to 110°C.

 

6. Lightweight Phenolic Resin Cage

The lightweight high-strength phenolic resin cage provides excellent guidance accuracy and low friction at high speeds, contributing to reduced centrifugal forces, friction, and heat generation – a key factor in achieving the 46,000 r/min limiting speed.

 

7. Clear Performance Specifications

 

Parameter Value

Bore d 50 mm

Outer Diameter D 80 mm

Total Width B 32 mm (2×16 mm)

Contact Angle 25°

Radial Dynamic Load Rating 24.2 kN (5,445 lbf)

Radial Static Load Rating 20.0 kN (4,500 lbf)

Ball Diameter Dw 7.938 mm

Balls per Bearing 21

Speed (Oil-Air) 46,000 r/min

Ball Material Silicon Nitride (Si₃N₄)

Ring Material Chrome Steel

Cage Material Phenolic

Tolerance Class P4A

Preload Class L1 (Light)

Arrangement Tandem (<<) DT

Bearings in Set 2

Weight 0.46 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7010 ACE/HCP4AL1DT is ideally suited for ultra-high-speed precision equipment where unidirectional axial loads dominate:

 

CNC Lathe Spindles – sustaining continuous axial cutting feed forces

 

Vertical/Horizontal Machining Centers – heavy milling spindles (fixed axial direction)

 

Deep-Hole Drilling Spindles – high-thrust drilling and gun-drilling applications

 

Grinding Machine Wheel Spindles – high-speed rotation under unidirectional grinding forces

 

High-Speed Electric Spindles – precision machining units with constant axial load direction

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

Medical Equipment – high-speed dental drills and medical imaging devices

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Industrial Robots – high-precision transmission mechanisms and rotary axes

 

Important Installation Notes

⚠️ This is a non-universal matched fixed set (DT) – the 2 bearings are supplied as one complete unit. Do not interchange or mix with other bearings of the same model.

 

⚠️ The tandem arrangement (<<) is directional. Ensure the contact angle direction points toward the incoming axial load – incorrect orientation will eliminate load capacity.

 

✅ This set comes with factory-preset L1 light preload. No additional preload adjustment is required during installation. However, ensure shaft and housing fits comply with P4A grade requirements (bore/OD tolerance -0.004mm to 0).

 

✅ To achieve the 46,000 r/min limiting speed, oil-air lubrication is strongly recommended.

 

⚠️ 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) applies stringent end-face parallelism and height-difference matching grinding to every DT tandem set, ensuring load-sharing deviation between the two rows is minimized to an extremely small range. The 7010 ACE/HCP4AL1DT delivers P4A accuracy, E-type high-speed design, hybrid ceramic technology, L1 light preload, and tandem-doubled axial capability for long-lasting, stable rotational support in your heavy-duty unidirectional-load ultra-high-speed spindles.

 

Choose NMT 7010 ACE/HCP4AL1DT for:

 

✅ Tandem (DT) arrangement – doubled unidirectional axial capacity

 

✅ 25° contact angle + E-type high-speed design – 46,000 r/min ultra-high speed and heavy load combined

 

✅ Hybrid ceramic technology – a leap in high-speed performance

 

✅ L1 light preload – ideal for high-speed precision applications

 

✅ P4A super-precision running accuracy

 

✅ Lightweight phenolic resin cage

 

✅ Factory pre-matched – ready to install

 

✅ Reliable choice for heavy-load ultra-high-speed conditions