Product Overview

The NMT 7016 ACD/P4AQBCC is a pre-assembled quadruplex QBC matched super-precision all-steel angular contact ball bearing set, comprising 4 rows of bearings precision-paired in a tandem-back-to-back-tandem (<<>>) QBC configuration. With a total width of 88 mm (22 mm per row × 4), an 80 mm bore, and a 125 mm outer diameter, this set features a 25° contact angle (AC type) and D-type high-capacity design, combined with all-steel rolling elements and a phenolic resin cage, factory-preset with Class C moderate preload, delivering ultimate bidirectional axial rigidity, overturning moment resistance, and high load capacity.

 

The bearing set offers a radial dynamic load rating of 37,125 lbf (165 kN) and a static load rating of 52,200 lbf (232 kN). The QBCC configuration indicates that this set consists of 4 fully matched bearings arranged in a QBC (tandem-back-to-back-tandem) configuration, providing the highest system rigidity and bidirectional axial load capacity. Manufactured to the P4A super-precision tolerance class with Class C moderate preload, the set achieves a limiting speed of 28,000 r/min. The operating temperature range is -30°C to 110°C. The set weighs 3.42 kg.

 

Model Code Decoding – Understanding NMT 7016 ACD/P4AQBCC

Code Meaning

7016 Basic series designation, 80 mm bore, 125 mm OD

AC Angular contact design with 25° contact angle

D D-type high-capacity design – optimized internal geometry for higher load capacity

P4A Super-precision tolerance class – surpassing ABEC 7 standards, bore and OD tolerances -0.004 mm to 0

QBC Quadruplex QBC arrangement – 4 bearings arranged in tandem-back-to-back-tandem (<<>>) configuration

C Class C moderate preload – ideal for high-speed heavy-load applications

Core Configuration Insight: The QBC (<<>>) configuration consists of 4 bearing rows – the center two in back-to-back (<> ) providing maximum overturning rigidity, with one tandem (>>) row on each side doubling unidirectional axial load capacity. This is a non-universal matchable fixed set – the 4 bearings are factory end-face matched and must not be interchanged or mixed with other bearings.

 

Core Performance Advantages

1. QBC Quadruplex Configuration – Ultimate System Rigidity and Bidirectional Axial Load Capacity

The QBC (<<>>) configuration combines the dual advantages of back-to-back (<> ) and tandem (>>) arrangements:

 

Center two rows back-to-back: Provides maximum overturning moment rigidity, effectively resisting bending and eccentric loads

 

One tandem row on each side: Doubles unidirectional axial load capacity on each side, with symmetric layout achieving perfect bidirectional axial load balance

 

Dynamic load rating 37,125 lbf (165 kN) , static load rating 52,200 lbf (232 kN)

 

2. 25° Contact Angle (AC Type) + D-Type High-Capacity Design – High Load and High Rigidity Combined

The 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 14.288 mm, 20 balls per bearing – achieves an outstanding 165 kN dynamic and 232 kN static load rating.

 

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

Class C moderate 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 the 28,000 r/min limiting speed.

 

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

The P4A tolerance class (surpassing ABEC 7) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004 mm to 0. All 4 bearings undergo factory precision end-face matching grinding, ensuring highly uniform load distribution across all rows, preventing individual bearing overload, and significantly extending overall set service life. Operating temperature range is -30°C to 110°C.

 

5. 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 28,000 r/min limiting speed.

 

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

Premium chrome steel rings and balls offer higher fracture toughness and impact resistance – more reliable under interrupted cutting and accidental overload conditions.

 

7. Open Design – Flexible Lubrication Options

This set features an open design and comes pre-lubricated from the factory – ready to install out of the box.

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 80 mm

Outer Diameter D 125 mm

Total Width B 88 mm (4×22 mm)

Contact Angle 25°

Dynamic Radial Load 37,125 lbf (165 kN)

Static Radial Load 52,200 lbf (232 kN)

Ball Diameter Dw 14.288 mm

Balls per Bearing 20

Limiting Speed 28,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class C (Moderate)

Arrangement QBC (<<>>)

Bearings in Set 4

Weight 3.42 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7016 ACD/P4AQBCC is engineered for premium precision equipment demanding ultimate system rigidity, high load capacity, and uncompromising accuracy:

 

Heavy-Duty Machine Tool Spindles – heavy CNC machine tools, large precision grinders, milling center spindles

 

Heavy-Duty Machining Centers – large-depth, high-feed vertical/horizontal spindle systems

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

High-Speed Rotating Machinery – high-speed drilling and milling machines

 

Precision Rotary Tables – high-accuracy heavy-load rotary positioning

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Medical Equipment – high-speed CT scanners, medical imaging devices

 

Industrial Robots – high-precision transmission mechanisms and rotary axes

 

Important Installation Notes

⚠️ This is a non-universal matchable fixed set (QBC) – the 4 bearings are supplied as one complete unit. Do not interchange or mix with other bearings of the same model.

 

⚠️ The QBC (<<>>) configuration is strictly directional. Installation must strictly follow NMT's assembly drawings to ensure correct contact angle orientation for each row. Incorrect orientation will completely eliminate load capacity.

 

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

 

✅ To achieve the 28,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

⚠️ Total width is 88 mm. Ensure sufficient axial installation space.

 

✅ This set features an open design and comes pre-lubricated from the factory – ready to install out of the box.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies the most stringent end-face matching grinding and preload control to every QBC quadruplex bearing set. All 4 bearings undergo complete factory matching and full-parameter inspection, ensuring load-sharing deviation between rows is minimized to an extremely small range. The 7016 ACD/P4AQBCC delivers P4A accuracy, 25° contact angle high rigidity, D-type high-capacity design, QBC quadruplex ultimate rigidity, and Class C moderate preload for unparalleled rotational support in your premier heavy-duty high-speed spindles.

 

Choose NMT 7016 ACD/P4AQBCC for:

 

✅ QBC quadruplex configuration – ultimate system rigidity and bidirectional load capacity

 

✅ 25° contact angle + D-type high capacity – 165 kN (37,125 lbf) high load capacity

 

✅ Class C moderate preload – ideal for high-speed heavy-load applications

 

✅ P4A super-precision running accuracy – bore/OD tolerance -0.004 mm to 0

 

✅ 28,000 r/min ultra-high-speed performance

 

✅ Phenolic resin cage – low friction, low noise, high speed

 

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

 

✅ Factory pre-matched and pre-lubricated – ready to install