Product Overview

The NMT 7009 CDGATP/P4B is a universal matchable single-row super-precision all-steel angular contact ball bearing with a 45 mm bore, 75 mm outer diameter, and 16 mm width. Featuring a 15° contact angle (CD type) and D-type high-capacity design, it delivers a basic dynamic load rating of 28.6 kN and static load rating of 22.4 kN within a compact envelope. Manufactured to the P4B super-precision tolerance class – with tighter bore and outside diameter tolerances than P4A – and equipped with a glass fibre reinforced phenolic cage (TP) and GA light-preload universal matchable capability, this bearing can be flexibly configured on-site as back-to-back (<>), face-to-face (><), or tandem (>>) arrangements to suit various load directions and spatial constraints.

 

The GATP suffix combination represents the core value of this product – GA signifies a single bearing with universal matchable capability and light preload; TP denotes a glass fibre reinforced phenolic cage offering high strength and excellent high-speed guidance; P4B represents dimensional accuracy to P4 class with running accuracy exceeding P4. This suffix combination delivers the highest level of precision, cage strength, and arrangement flexibility in the NMT 7009 series.

 

Model Code Decoding – Understanding NMT 7009 CDGATP/P4B

Code Meaning

7009 Basic series designation, 45 mm bore

CD 15° contact angle design – provides excellent balance between radial and axial load capacity

G Single bearing (not a pre-assembled set)

A Light preload (Class A) – universal matchable with factory-preset light preload for high-speed applications

TP Glass fibre reinforced phenolic cage – high strength, heat resistance, and excellent high-speed guidance

P4B Ultra-high precision tolerance class – dimensional accuracy to ISO P4 class, with tighter bore and OD tolerances than P4A, and running accuracy exceeding P4

Core Value: GA universal matchability means every 7009 CDGATP/P4B bearing's end-face height difference and parallelism are strictly controlled, allowing any two bearings of the same model to be directly paired without selection or re-grinding. The TP cage, made of glass fibre reinforced phenolic resin, offers higher strength and heat resistance than standard phenolic cages, providing more stable rolling element guidance at high speeds. The P4B precision class ensures tighter bore and outside diameter tolerances than P4A, delivering ultimate rotational accuracy for ultra-high-precision spindles.

 

Core Performance Advantages

1. P4B Ultra-High Precision – Beyond P4A

P4B is a new tolerance class from SKF with tighter bore and outside diameter tolerances than P4A. This translates to lower radial runout and axial play, delivering micron-level or even sub-micron rotational accuracy for ultra-high-precision machine tool spindles and precision measurement equipment. P4B class bearings offer significantly improved running accuracy over standard P4 class bearings.

 

2. 15° Contact Angle + D-Type High-Capacity Design – Perfect Balance of Speed and Load

The 15° small contact angle generates less frictional heat at equivalent speeds. Combined with the D-type high-capacity design featuring 17 balls of 9.525 mm diameter, it delivers an outstanding 28.6 kN dynamic load rating and 22.4 kN static load rating – far exceeding the capacity of bearings in the same size class.

 

3. Glass Fibre Reinforced Phenolic Cage (TP) – Speed and Durability Combined

The TP cage, made of glass fibre reinforced phenolic resin, offers distinct advantages over standard phenolic cages:

 

Higher mechanical strength: Glass fibre reinforcement significantly improves fracture resistance

 

Superior heat resistance: Maintains dimensional stability at high operating temperatures

 

More precise rolling element guidance: Ensures accurate ball trajectories at high speeds, reducing vibration and noise

 

4. Universal Matchable (GA) – One Inventory, Infinite Arrangements

GA universal matchability delivers outstanding value:

 

Simplified inventory: Stock a single model to cover DB, DF, and DT pairing needs

 

On-site flexibility: Change arrangements during commissioning based on actual load directions

 

Easy maintenance: Replace individual bearings without replacing entire matched sets

 

Cost optimization: Reduce spare parts variety and inventory holding costs

 

5. Light Preload (Class A) – Precision Stiffness at High Speeds

Class A light preload provides sufficient contact stiffness while minimizing frictional heat generation at high speeds, enabling the bearing to maintain stable temperature performance at 30,000 r/min oil lubrication limiting speeds. Grease lubrication limits speed to 19,000 r/min.

 

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

Compared to hybrid ceramic versions, all-steel construction offers higher fracture toughness and impact resistance – more reliable under interrupted cutting and accidental overload conditions. All-steel bearings also offer lower procurement costs, making them the optimal choice for high-volume applications and spare parts inventory.

 

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 45 mm

Outer Diameter D 75 mm

Width B 16 mm

Contact Angle α 15°

Dynamic Load Rating C 28.6 kN

Static Load Rating C₀ 22.4 kN

Fatigue Load Limit Pu 0.95 kN

Speed (Grease) 19,000 r/min

Speed (Oil) 30,000 r/min

Ball Diameter Dw 9.525 mm

Balls per Bearing 17

Number of Rows 1

Reference Grease Amount Gref 3.3 cm³

Distance to Pressure Point a 16.1 mm

Weight 0.24 kg

Carbon Footprint 0.89 kg CO₂e

Typical Applications

The NMT 7009 CDGATP/P4B, with its P4B ultra-high precision, TP high-strength cage, and universal matchable flexibility, covers an exceptionally wide range of high-end applications:

 

Ultra-High-Precision Machine Tool Spindles – precision turning, milling, and grinding spindles

 

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

 

CNC Machining Centers – vertical/horizontal spindle systems

 

Precision Measurement Equipment – coordinate measuring machines (CMM), roundness testers

 

Optical Precision Instruments – high-precision rotary scanning mechanisms

 

Aerospace Component Machining – high precision and reliability requirements

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Equipment Maintenance Spare Parts – one inventory covering multiple arrangement needs

 

Arrangement Application Guide

Single-row use: A single 7009 CDGATP/P4B can be used independently for light-load, space-constrained simple rotary mechanisms.

 

Two-row matched pair: Take two bearings of the same model and directly combine as:

 

DB (Back-to-back) : Outer ring thick end faces facing each other – highest overturning rigidity

 

DF (Face-to-face) : Outer ring thin end faces facing each other – accommodates shaft thermal expansion

 

DT (Tandem) : Both bearings oriented in the same direction – doubled unidirectional axial capacity

 

Three or more rows: Can be combined into TBT, TFT, QBC, and other complex configurations for ultra-high rigidity or extreme axial load capacity.

 

Key Advantage: All arrangements require no selective shimming or additional grinding – simply install to achieve the design preload.

 

Important Installation Notes

✅ This bearing is universally matchable (GA) – any two bearings of the same model can be directly paired.

 

✅ For paired installations, using bearings from the same production batch is recommended for optimal consistency.

 

✅ To achieve the 30,000 r/min oil lubrication limiting speed, oil-air or oil-mist lubrication is recommended. Grease lubrication limits speed to 19,000 r/min.

 

⚠️ The TP cage is made of glass fibre reinforced phenolic resin – avoid contact with sharp tools during installation to prevent cage damage.

 

⚠️ Preload is Class A light preload. Ensure shaft and housing fits comply with NMT recommended tolerances to achieve the designed preload value.

 

⚠️ The P4B ultra-high precision class demands higher installation environment and assembly standards – professional installation by trained personnel is recommended.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7009 CDGATP/P4B bearing – from ring material (high-purity bearing steel) and rolling elements to superfinishing processes. End-face height difference, parallelism, and contact angle deviation of each bearing are tightly controlled to ensure universal matchability consistency across any two bearings of the same model. The combination of P4B precision, TP high-strength cage, 15° contact angle, and GA light preload makes this bearing the highest-precision, strongest-cage, most flexible flagship universal precision bearing in the NMT 7009 series.

 

Choose NMT 7009 CDGATP/P4B for:

 

✅ P4B ultra-high precision – ultimate rotational accuracy beyond P4A

 

✅ TP glass fibre reinforced phenolic cage – high strength, heat resistance, precise guidance

 

✅ 15° contact angle + D-type high capacity – perfect balance of speed and load

 

✅ Universal matchable – one inventory, infinite arrangements

 

✅ GA light preload – precision stiffness at high speeds

 

✅ 30,000 r/min ultra-high-speed performance

 

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

 

✅ Simplified inventory and cost optimization