Product Overview

The NMT 7006 CDGB/P4A is a universal matchable single-row super-precision all-steel angular contact ball bearing with a 30 mm bore, 55 mm outer diameter, and 13 mm width. Featuring a 15° contact angle (CD type) and D-type high-capacity design, it delivers a basic dynamic load rating of 14.3 kN and static load rating of 8.0 kN within a compact envelope. Manufactured to P4A super-precision tolerance class and equipped with GB 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 GB suffix represents the core value of this product – it signifies that each bearing has undergone precision end-face grinding at the factory, enabling universal matchability. Users can freely combine bearings without ordering specific pre-matched sets, dramatically simplifying inventory management and procurement processes.

 

Model Code Decoding – Understanding NMT 7006 CDGB/P4A

Code Meaning

7006 Basic series designation, 30 mm bore, 13 mm width compact design

CD 15° contact angle design – higher limiting speed, lower heat generation for high-speed operation

G Single bearing (not a pre-assembled set)

B Universal matchable with Class B measured load preload – supports back-to-back (<>), face-to-face (><), or tandem (>>) configurations with factory-preset Class B preload

P4A Super-precision tolerance class – dimensional accuracy P4, running accuracy exceeding P4

Note: Absence of "HC" suffix indicates all-steel rolling elements (not ceramic), offering cost-effectiveness and superior impact toughness.

 

Core Value: GB universal matchability means every 7006 CDGB/P4A bearing's end-face height difference and parallelism are strictly controlled within tight limits. Any two bearings of the same model can be directly paired without selection or re-grinding. This feature fundamentally breaks the limitation of traditional fixed matched sets, offering users unprecedented arrangement flexibility.

 

Core Performance Advantages

1. Universal Matchable (GB) – One Inventory, Infinite Arrangements

GB 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

 

2. Class B Measured Load Preload – The Universal Preload Choice

Class B preload represents the most commonly used preload level in angular contact bearings, offering the optimal balance between rigidity and temperature rise. Compared to Class A (light preload), Class B provides higher system rigidity; compared to Class C (medium preload), Class B generates lower operating temperatures. This balance makes Class B the most versatile preload choice, suitable for the vast majority of high-speed spindle applications.

 

3. 15° Contact Angle – Superior High-Speed Performance

The 15° small contact angle generates less frictional heat at equivalent speeds, making it ideal for 56,000 r/min-class ultra-high-speed operation. Through flexible selection of DB/DF/DT arrangements, users can fine-tune between high speed and load capacity.

 

4. D-Type High-Capacity Design – High Load in Compact Space

By optimizing rolling element diameter and count, the D-type design achieves 14.3 kN dynamic and 8.0 kN static load ratings within a 13 mm width – over 30% higher capacity than standard designs.

 

5. 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.

 

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

The P4A tolerance class guarantees minimal radial runout and axial play, meeting stringent surface quality and dimensional consistency requirements.

 

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

Typical Applications

The NMT 7006 CDGB/P4A, with its universal matchable flexibility, covers an exceptionally wide range of applications:

 

General Machine Tool Spindles – turning, milling, and grinding spindles

 

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

 

CNC Machining Centers – vertical/horizontal spindle systems

 

Precision Rotary Tables and Indexing Devices – high-accuracy rotary positioning

 

Industrial Robot Joints – high-precision transmission mechanisms

 

High-Speed Motors and Generators – various high-speed rotating machinery

 

Equipment Maintenance Spare Parts – one inventory covering multiple arrangement needs

 

Arrangement Application Guide

Single-row use: A single 7006 CDGB/P4A 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 (GB) – 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.

 

✅ Maximum limiting speed depends on lubrication, arrangement type, and mounting fit. Tandem (DT) arrangements typically have slightly lower limiting speeds than DB/DF.

 

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

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7006 CDGB/P4A bearing – from ring material 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 P4A precision and Class B preload makes this bearing the most versatile and flexible core member of the NMT 7006 series.

 

Choose NMT 7006 CDGB/P4A for:

 

✅ Universal matchable – one inventory, infinite arrangements

 

✅ Class B preload – optimal balance of rigidity and temperature

 

✅ 15° contact angle ultra-high-speed performance

 

✅ D-type high-capacity design

 

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

 

✅ P4A super-precision running accuracy

 

✅ Simplified inventory and cost optimization