Product Overview

The NMT 7013 CD/P4ADT is a pre-assembled duplex tandem matched super-precision all-steel angular contact ball bearing set, comprising 2 rows of bearings precision-paired in a tandem (<<) configuration. With a total width of 36 mm (18 mm per row × 2), a 65 mm bore, and a 100 mm outer diameter, this set features a 15° contact angle (CD type) and D-type high-capacity design, combined with all-steel rolling elements and a phenolic resin cage, specifically optimized for high-speed rotational applications dominated by heavy unidirectional axial loads.

 

The bearing set offers a radial dynamic load rating of 67.6 kN (15,210 lbf) and a static load rating of 75 kN (16,875 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 the P4A super-precision tolerance class with bore and OD tolerances controlled within -0.004 mm to 0, the set achieves a limiting speed of 24,000 r/min under oil-air lubrication. The set weighs 0.86 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7013 CD/P4ADT

Code Meaning

7013 Basic series designation, 65 mm bore (13×5 mm), 100 mm OD

CD 15° contact angle design – offers higher limiting speed and lower heat generation than 25° designs

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

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. The CD-type 15° contact angle generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° designs. The D-type high-capacity design is best suited for heavier loads compared to equivalent B and E type high-speed bearings. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these four elements work together to make this bearing set the ultimate solution for heavy-load unidirectional high-speed spindles. 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. 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 a dynamic radial load rating of 67.6 kN (15,210 lbf) and static radial load rating of 75 kN (16,875 lbf) , this set is ideal for heavy-cutting lathe spindles, powerful drilling spindles, and other unidirectional thrust applications. The tandem matched pair ensures consistent preload distribution, enhancing overall system rigidity and load distribution uniformity.

 

2. 15° Contact Angle (CD Type) + D-Type High-Capacity Design – Ultra-High Speed and High Load Combined

The 15° small contact angle generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° designs, with a limiting speed of 24,000 r/min under oil-air lubrication. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 11.112 mm, 20 balls per bearing – achieves an outstanding 67.6 kN dynamic and 75 kN static load rating. Compared to equivalent B and E type high-speed bearings, the D-type design is best suited for heavier loads.

 

3. All-Steel Rolling Elements – 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.

 

4. Factory Precision Matching – Uniform Load Distribution

Every DT set undergoes end-face matching grinding and preload configuration at the NMT factory, ensuring highly uniform load sharing between the two bearings in tandem installation, preventing individual bearing overload, and significantly extending overall set service life.

 

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

The P4A tolerance class (dimensional accuracy to ISO P4 class, running accuracy superior to P4) 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.

 

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 24,000 r/min limiting speed.

 

7. Open Design – Flexible Lubrication Options

This set features an open design, allowing flexible selection of lubrication methods based on application requirements – grease lubrication for general applications, oil-air or oil-mist lubrication for high-speed heavy-load conditions.

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 65 mm

Outer Diameter D 100 mm

Total Width B 36 mm (2×18 mm)

Contact Angle 15°

Dynamic Radial Load 67.6 kN (15,210 lbf)

Static Radial Load 75 kN (16,875 lbf)

Fatigue Load Limit Pu 3.15 kN

Ball Diameter Dw 11.112 mm

Balls per Bearing 20

Limiting Speed 24,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Arrangement Tandem (<<) DT

Bearings in Set 2

Weight 0.86 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7013 CD/P4ADT is ideally suited for 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 does not have a preset internal preload (marked as "not applicable"). Actual preload must be controlled during installation via locknut torque or precision spacers. Strictly follow NMT's installation guidelines and recommended torque values.

 

✅ To achieve the 24,000 r/min limiting speed, oil-air or oil-mist lubrication is strongly recommended. Grease lubrication will result in a lower limiting speed.

 

✅ This set is open design – select appropriate lubrication method based on application.

 

⚠️ Ensure shaft and housing fits comply with P4A grade requirements (bore/OD tolerance -0.004 mm to 0) to achieve the expected rotational accuracy and service life.

 

⚠️ Ensure shaft and housing bore concentricity and straightness meet P4A grade requirements.

 

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 7013 CD/P4ADT delivers P4A accuracy, 15° contact angle ultra-high-speed performance, D-type high-capacity design, and tandem-doubled axial capability for long-lasting, stable rotational support in your heavy-duty unidirectional-load high-speed spindles.

 

Choose NMT 7013 CD/P4ADT for:

 

✅ Tandem (DT) arrangement – doubled unidirectional axial capacity

 

✅ 15° contact angle + D-type high capacity – 24,000 r/min ultra-high speed and 67.6 kN high load combined

 

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

 

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

 

✅ Lightweight phenolic resin cage – low friction, low noise, high speed

 

✅ Factory pre-matched – ready to install