Product Overview

The NMT 7016 ACD/P4ADBC is a pre-assembled duplex back-to-back matched super-precision all-steel angular contact ball bearing set, comprising 2 rows of bearings precision-paired in a back-to-back (<>) configuration. With a total width of 44 mm (22 mm per row × 2), 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. It delivers ultimate overturning rigidity, high load capacity, and bidirectional axial load capability, accommodating radial and bidirectional axial loads simultaneously.

 

The bearing set offers a basic dynamic load rating of 101 kN (22,725 lbf) and a static load rating of 116 kN (26,100 lbf). The DB back-to-back configuration extends the load action points outward, creating a maximum effective span that provides the highest overturning moment 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 1.68 – 1.71 kg.

 

Model Code Decoding – Understanding NMT 7016 ACD/P4ADBC

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

DB Duplex Back-to-Back – 2 bearings mounted with contact angles facing outward (<>), providing maximum overturning rigidity and bidirectional axial load capacity

C Class C moderate preload – optimal balance between rigidity and speed performance for high-speed heavy-load applications

Core Value: The DB back-to-back configuration (<>) extends the load action points outward, maximizing the effective span and significantly enhancing spindle resistance to bending moments. The AC-type 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 101 kN dynamic and 116 kN static load rating. Class C moderate preload provides the optimal balance between high-speed capability and system rigidity. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these five elements work together to make this bearing set the flagship precision bearing solution offering the perfect balance of ultimate overturning rigidity, high load capacity, and ultra-precision rotational accuracy. This is a non-universal matchable fixed set – the 2 bearings are factory end-face matched and must not be interchanged or mixed with other bearings.

 

Core Performance Advantages

1. Back-to-Back (DB) Configuration – Ultimate Overturning Rigidity and Bidirectional Load Capacity

The back-to-back (<> ) arrangement orients the contact angles outward in opposite directions, maximizing the effective span and providing the highest overturning moment rigidity. Whether facing axial load direction changes, radial cutting force fluctuations, or bending moment impacts, this configuration delivers the most stable rotational support. The precision-matched pair ensures uniform load distribution across both rows, significantly enhancing overall system rigidity. Dynamic load rating 101 kN (22,725 lbf) , static load rating 116 kN (26,100 lbf).

 

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 101 kN dynamic and 116 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 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, meeting stringent surface quality and dimensional consistency requirements. 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. All-steel bearings also offer significant cost advantages for high-volume industrial applications.

 

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. Flexible lubrication selection based on application.

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 80 mm

Outer Diameter D 125 mm

Total Width B 44 mm (2×22 mm)

Contact Angle 25°

Dynamic Load Rating C 101 kN (22,725 lbf)

Static Load Rating C₀ 116 kN (26,100 lbf)

Fatigue Load Limit Pu 4.9 kN

Ball Diameter Dw 14.288 mm

Balls per Bearing 20

Limiting Speed 28,000 r/min

Reference Grease Amount Gref 11.1 cm³

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class C (Moderate)

Arrangement Back-to-Back (<> ) DB

Bearings in Set 2

Weight 1.68 – 1.71 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7016 ACD/P4ADBC, with its DB back-to-back ultimate overturning rigidity, D-type high-capacity design, and P4A super-precision grade, 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 – high-speed rotary units

 

Machining Center Spindles – vertical/horizontal spindle systems

 

Precision Rotary Tables – high-accuracy rotary positioning

 

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

 

High-Precision Industrial Gearboxes – precision transmission systems

 

Important Installation Notes

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

 

⚠️ The back-to-back configuration (<> ) is directional. Ensure the contact angles face outward to achieve the expected overturning rigidity.

 

✅ 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).

 

✅ This set is open design and comes pre-lubricated from the factory – ready to install out of the box. To achieve the 28,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

⚠️ Ensure shaft and housing bore concentricity and straightness meet P4A grade requirements to achieve the expected rotational accuracy and service life.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies the most stringent end-face matching grinding and preload control to every DB back-to-back bearing set. Both 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/P4ADBC delivers P4A accuracy, 25° contact angle high rigidity, D-type high-capacity design, DB back-to-back ultimate rigidity, and Class C moderate preload for unparalleled rotational support in your premier high-speed spindles.

 

Choose NMT 7016 ACD/P4ADBC for:

 

✅ DB back-to-back configuration – ultimate overturning rigidity and bidirectional axial load capacity

 

✅ 25° contact angle + D-type high capacity – 101 kN (22,725 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