Product Overview

The NMT 7010 ACD/P4AQGC is a pre-assembled quadruplex universal matchable super-precision all-steel angular contact ball bearing set, comprising 4 rows of bearings precision-paired in a universal matchable (SU) configuration. With a total width of 64 mm (16 mm per row × 4), 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 Class C medium preload and pre-lubricated with grease, delivering ultimate system rigidity, load capacity, and flexible arrangement capability for ultra-high-rigidity spindles.

 

The bearing set offers a basic dynamic load rating of 74.1 kN and static load rating of 93 kN – more than four times the capacity of a single-row bearing. The QGC universal matchable suffix indicates that this set consists of four 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 Class C medium preload, 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/P4AQGC

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

QGC Quadruplex General Arrangement with Class C preload – 4-bearing matched set with universal matchable (SU) capability, factory-preset Class C medium preload, pre-greased

Core Value: The QGC suffix is the key identifier of this product – it signifies a quadruplex matched set (4 bearings supplied as a complete unit) with universal matchable (SU) capability. Unlike standard single bearings, the QGC set has undergone factory end-face matching grinding, with bore and OD matching precision controlled within one-third of the allowable tolerance, ensuring uniform load distribution across all 4 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. The Class C medium preload provides excellent system rigidity, particularly suitable for heavy-load high-speed applications demanding superior stiffness.

 

Core Performance Advantages

1. Quadruplex Matched Set + Universal Matchable – Ultimate Rigidity Meets Ultimate Flexibility

The QGC configuration precision-pairs four bearings into one complete unit, delivering four times 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 multiple 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 outstanding 74.1 kN dynamic and 93 kN static load ratings within a compact 64 mm total width. The set weighs only 0.995 – 1.02 kg.

 

3. Class C Medium Preload – Ideal for High-Speed Heavy-Load Applications

Class C medium preload provides "just-right" internal contact stiffness for high-speed spindles – compared to light preload (A/B), Class C offers higher system rigidity, making it particularly suitable for heavy cutting and high feed rate applications requiring superior stiffness. At the same time, Class C avoids excessive temperature rise from over-preloading, ensuring stable temperature performance even at 46,000 r/min limiting speeds. The set comes pre-greased from the factory – ready to install out of the box.

 

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 for high-volume industrial applications.

 

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. Universal Matchable Feature – 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 64 mm (4×16 mm)

Contact Angle 25°

Dynamic Load Rating C 74.1 kN

Static Load Rating C₀ 93 kN

Ball Diameter Dw 9.525 mm

Balls per Bearing 18

Speed 46,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic

Tolerance Class P4A

Preload Class C (Medium)

Arrangement Universal Matchable (SU)

Bearings in Set 4

Weight 0.995 – 1.02 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7010 ACD/P4AQGC, with its quadruplex-matched ultimate rigidity, universal matchable flexibility, and Class C medium-preload high stiffness, covers an exceptionally wide range of high-end applications:

 

Heavy-Duty Machine Tool Spindles – heavy CNC machine tools, large 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

 

Heavy Cutting Equipment – large-depth, high-feed-rate machining applications

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

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

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Important Installation Notes

⚠️ This is a QGC quadruplex matched set – the 4 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.

 

✅ This set comes pre-greased from the factory – ready to install out of the box.

 

⚠️ This set comes with factory-preset Class C medium 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 each row 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/P4AQGC bearing set – from ring material (high-purity chrome steel) and rolling elements to superfinishing processes. Every QGC quadruplex set undergoes factory end-face matching grinding and Class C medium preload setting, with bore and OD matching precision controlled within one-third of the allowable tolerance, ensuring load-sharing deviation across all 4 rows is minimized to an extremely small range. The combination of P4A precision, 25° contact angle, D-type high-capacity design, Class C medium preload, and universal matchable flexibility makes this bearing set the flagship precision bearing solution in the NMT 7010 series – offering the perfect balance of ultimate rigidity and maximum flexibility.

 

Choose NMT 7010 ACD/P4AQGC for:

 

✅ Quadruplex matched set – four times system rigidity and load capacity

 

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

 

✅ Universal matchable – one inventory, multiple arrangements

 

✅ Class C medium preload – ideal for high-speed heavy-load 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 and pre-greased – ready to install