Product Overview

The NMT 7010 ACD/P4ADGA is a pre-assembled duplex universal matchable super-precision angular contact ball bearing set, comprising 2 rows of bearings precision-paired in a universal matchable (SU) 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 (AC type) and D-type high-capacity design, with all-steel rolling elements and a phenolic resin cage, factory-preset with extra light preload (Class A) to deliver superior system rigidity and flexible arrangement capability for high-speed spindles.

 

The bearing set offers a basic dynamic load rating of 48.8 kN and static load rating of 48 kN – more than double the capacity of a single-row counterpart. The GA universal matchable suffix indicates that this set consists of two fully matched bearings that can be freely configured in back-to-back (<>), face-to-face (><), or tandem (>>) arrangements. Manufactured to P4A super-precision tolerance class with extra light preload (Class A) , the set maintains micron-level rotational accuracy and stable temperature performance even at 46,000 r/min limiting speeds.

 

Model Code Decoding – Understanding NMT 7010 ACD/P4ADGA

Code Meaning

7010 Basic series designation, 50 mm bore, 80 mm OD, 16 mm single-row width

AC Angular contact design with 25° contact angle – delivers superior axial rigidity and radial load capacity

D High-capacity D-type design – optimized ball size and quantity (18 balls of 9.525 mm per bearing) for higher load capacity

P4A Super-precision tolerance class – dimensional accuracy to ISO P4 class, running accuracy superior to P4

DGA Duplex General Arrangement – 2-bearing matched set with universal matchable capability, factory-preset Class A extra light preload

Core Value: The DGA suffix is the key identifier of this product – it signifies a duplex matched set (2 bearings supplied as a complete unit) with universal matchable (SU) capability. Unlike standard single bearings, the DGA set has undergone factory end-face matching grinding to ensure uniform load distribution across both rows. The universal matchable feature allows flexible installation in back-to-back (<>), face-to-face (><), or tandem (>>) configurations, eliminating the need to order different pairing specifications for different arrangements.

 

Core Performance Advantages

1. Duplex Matched Set + Universal Matchable – The Perfect Union of Rigidity and Flexibility

The DGA configuration precision-pairs two bearings into one complete unit, delivering double the load capacity and system rigidity. Meanwhile, the universal matchable (SU) feature means users don't need separate inventory for different mounting arrangements (DB/DF/DT) – one set covers all three configurations, dramatically simplifying inventory management and procurement.

 

2. 25° Contact Angle + D-Type High-Capacity Design – Powerful Combined Load Capacity

The 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. The D-type high-capacity design, with optimized ball diameter (9.525 mm) and quantity (18 balls per bearing), achieves an outstanding 48.8 kN dynamic and 48 kN static load rating within a compact 32 mm total width. The set weighs only 0.51 kg.

 

3. Extra Light Preload (Class A) – Ideal for High-Speed Precision Applications

Class A extra light preload provides "just-right" internal contact stiffness for high-speed spindles – eliminating internal clearance, reducing vibration and noise at high speeds, while avoiding excessive temperature rise from over-preloading. This ensures stable temperature performance even at 46,000 r/min limiting speeds.

 

4. 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.

 

5. All-Steel Construction – High Rigidity, Impact Resistance, Cost-Effectiveness

Premium chrome steel rings and balls offer higher fracture toughness and impact resistance than hybrid ceramic versions – more reliable under interrupted cutting and accidental overload conditions. All-steel bearings also offer significant cost advantages.

 

6. Lightweight Phenolic Resin Cage

The 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. Three Arrangement Options – Covering All Scenarios

 

Arrangement Symbol Characteristics Typical Applications

Back-to-back <> Maximum overturning rigidity, bidirectional axial load General machine tool spindles, machining centers

Face-to-face >< More flexible axial clearance adjustment, accommodates thermal expansion High-speed electric spindles, precision rotary tables

Tandem >> Doubled unidirectional axial load capacity Heavy-cutting lathes, drilling spindles

8. 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°

Dynamic Load Rating C 48.8 kN

Static Load Rating C₀ 48 kN

Ball Diameter Dw 9.525 mm

Balls per Bearing 18

Speed (Grease) 17,000 – 41,000 r/min

Speed (Oil) 28,000 – 46,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic

Tolerance Class P4A

Preload Class A (Extra Light)

Arrangement Universal Matchable (SU)

Bearings in Set 2

Weight 0.51 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7010 ACD/P4ADGA, with its duplex-matched rigidity, universal matchable flexibility, and extra-light-preload high-speed performance, covers an exceptionally wide range of high-end applications:

 

High-Speed Machine Tool Spindles – CNC machine tools, precision grinders, milling center spindles

 

High-Speed Electric Spindles – PCB drilling, micro-machining, engraving/milling

 

Machining Center Spindles – vertical/horizontal spindle systems

 

Precision Rotary Tables and Indexing Devices – high-accuracy rotary positioning

 

Industrial Robot Joints – high-precision transmission mechanisms and rotary axes

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

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

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

High-Speed Motors and Turbomachinery – various high-speed rotating machinery

 

Important Installation Notes

⚠️ This is a DGA duplex matched set – the 2 bearings are supplied as one complete unit. Do not separate or mix with other bearings of the same model.

 

✅ This set features universal matchable (SU) capability – freely configurable as back-to-back (<>), face-to-face (><), or tandem (>>) arrangements.

 

✅ To achieve the 46,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended. Grease lubrication limits speed to approximately 17,000 – 41,000 r/min.

 

⚠️ This set comes with factory-preset Class A extra 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).

 

⚠️ Ensure the contact angle direction of both bearings matches the intended load direction – incorrect orientation will eliminate load capacity.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7010 ACD/P4ADGA bearing set – from ring material (high-purity chrome steel) and rolling elements to superfinishing processes. Every DGA duplex set undergoes factory end-face matching grinding and Class A extra light preload setting, ensuring load-sharing deviation between the two rows is minimized to an extremely small range. The combination of P4A precision, 25° contact angle, D-type high-capacity design, Class A extra light preload, and universal matchable flexibility makes this bearing set the flagship precision bearing solution in the NMT 7010 series – offering the perfect balance of maximum rigidity and maximum flexibility.

 

Choose NMT 7010 ACD/P4ADGA for:

 

✅ Duplex matched set – doubled system rigidity and load capacity

 

✅ 25° contact angle + D-type high capacity – powerful combined load capability

 

✅ Universal matchable – one inventory, infinite arrangements

 

✅ Class A extra light preload – ideal for high-speed precision applications

 

✅ P4A super-precision running accuracy

 

✅ 46,000 r/min ultra-high-speed performance

 

✅ All-steel – high rigidity, impact resistance, cost-effectiveness

 

✅ Factory pre-matched – ready to install