1 Complete Model & Code Explanation

Model: 7013 CDGB/HCP4A

Code Definition

7013: Basic outer dimension of 70 series light-duty precision angular contact ball bearing

CD: 15° ultra-low contact angle optimized for ultra-high speed, limited axial load capacity, superior limiting speed

GB: One-piece solid brass cage, outer ring guided

HC: Silicon nitride ceramic rolling elements (hybrid ceramic bearing)

P4A: Ultra-precision grade with tight control of runout and dimensional grouping tolerance

Supply form: Supplied as single loose unit, freely combinable into DB/DT matched sets with two or more bearings

Comparative Reference Models

15° hybrid ceramic single bearing with GB outer ring guided cage: 7013 CDGB/HCP4A

15° hybrid ceramic single bearing with GA inner ring guided cage: 7013 CDGA/HCP4A

15° all-steel single bearing with GA solid cage: 7013 CDGA/P4A

15° hybrid ceramic factory DB matched set: 7013 CDGB/HCP4ADBD

15° hybrid ceramic factory DT matched set: 7013 CDGB/HCP4ADT

Core Basic Dimensions

Bore d: 65 mm

Outer diameter D: 100 mm

Width B: 18 mm

Contact angle: 15°

Structure: Single row open non-sealed hybrid ceramic single bearing

Rolling element: Silicon nitride Si₃N₄ ceramic balls

Ring material: High-carbon chromium bearing steel, ultra-precision mirror grinding on raceway

Cage: GB one-piece solid brass cage (outer ring guided)

Pre-filled lubricant: None

Surface treatment: Mirror finish for rings, high-precision sorted polishing for ceramic balls, no extra functional coating

Delivery form: Single bearing per package. Factory ground DB/DT matched sets available upon request; preload spacers sold separately

Note: Official dynamic load rating and limiting DN data can be requested from manufacturer.

Full Product Attributes

Contact form: Two-point contact

Number of rows: Single row, single unit

Pairing property: Loose single bearing. Bearings from same batch can be screened on-site for DB/DT matching. Factory pre-matched sets recommended for higher assembly consistency.

Precision class: P4A ultra-precision grade

Material: Inner & outer rings of high-carbon chromium bearing steel, rolling elements of silicon nitride ceramic (hybrid ceramic bearing)

Seal structure: Open type, non-sealed

Note: CD 15° ultra-low contact angle targets ultra-high-speed light-cutting built-in motor spindle applications. Compared with inner-ring-guided cages, GB outer-ring-guided solid brass cage realizes more uniform pocket load distribution under ultra-high speed, resisting centrifugal expansion deformation and reducing vibration. Silicon nitride ceramic balls feature low density, greatly reduced centrifugal force and less heat generation at high speed, delivering higher limiting DN than all-steel bearings. Its insulation property prevents electrical corrosion caused by shaft current inside built-in motor spindles. The 15° angle prioritizes rotational performance with limited axial capacity; continuous heavy axial load is prohibited. Open design is exclusively for oil-air lubrication; long-term sealed grease operation is forbidden. For on-site DB/DT assembly, strictly screen face height difference to avoid uneven preload and abnormal temperature rise.

2 Structure & Operating Characteristics

Japan NMT 7013 CDGB/HCP4A is a premium hybrid ceramic ultra-high-speed single angular contact bearing of the 7013 series. Inner and outer rings are manufactured from high-carbon chromium bearing steel with stabilized heat treatment and multi-stage aging, plus ultra-precision mirror raceway grinding. Equipped with GB outer-ring-guided one-piece solid brass cage for outstanding stability at extreme rotating speed. Rolling elements adopt high-purity silicon nitride ceramic balls with light weight, high rigidity, low friction coefficient and inherent insulation.

The 15° small contact angle lowers ball spin slip loss. Combined with low centrifugal property of ceramic balls, limiting rotating speed is significantly improved. Outer-ring-guided solid brass cage provides excellent thermal conductivity to continuously dissipate frictional heat, suitable for non-stop ultra-high-speed finishing. Disadvantages: ceramic rolling elements have weaker impact toughness than steel; impact loads should be avoided. Limited axial capacity may lead to contact ellipse distortion under overload, only applicable for light-load conditions. Supplied as single unit, flexible to configure DB back-to-back or DT tandem layout according to spindle design.

3 Core Performance Advantages

1. CD 15° ultra-high-speed optimized contact angle: Low spin friction loss at high speed, higher limiting speed than 20°/25° contact angle bearings for prolonged continuous ultra-high-speed finishing.

2. GB outer-ring-guided one-piece solid brass cage: Uniform pocket stress distribution, strong resistance to centrifugal expansion deformation under ultra-high speed, low vibration and excellent heat dissipation.

3. HC silicon nitride ceramic rolling elements: Light weight, low centrifugal force and greatly reduced heat generation at high speed; electrical insulation prevents electrical corrosion from shaft current of built-in motor spindles.

4. P4A ultra-precision grade: Strict control of radial and axial runout to maintain stable machining accuracy under long-term high-speed operation.

5. Open non-sealed structure: Eliminates extra friction heat from seal drag, fully compatible with oil-air forced circulation lubrication.

6. Flexible single-unit supply: Supports on-site DB/DT combination to adapt to various spindle support layouts.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A ultra-precision hybrid ceramic bearings must be assembled in constant-temperature dust-free clean workshops. Remove all burrs and metal debris on shaft and housing mating surfaces. Adopt controlled thermal mounting with limited heating temperature; open flame heating is prohibited. Never strike bearing rings violently, as ceramic balls tend to form invisible cracks under impact.

For on-site DB/DT matching, use bearings from identical production batch and screen face height tolerance.

5.2 Pairing & Preload Instructions

Supply condition: Single independent bearing without factory matching marks.

Optional layout: DB back-to-back pair, DT tandem pair.

Recommended preload: Light preload preferred for ultra-high-speed finishing; medium or heavy preload shall be avoided near maximum DN value.

Selection reference:

① Built-in motor spindle with shaft current, pursuit of ultra-high speed and low heat →7013 CDGB/HCP4A hybrid ceramic bearing with GB outer ring guided cage

② Belt-driven spindle without shaft current, cost control →7013 CDGA/P4A all-steel bearing with GA inner ring guided cage

③ Direct assembly without on-site screening →order factory pre-matched 7013 CDGB/HCP4ADBD / HCP4ADT sets

④ Medium cutting load balancing rigidity and rotational speed →ACE 20° series bearings

5.3 Lubrication Matching Scheme

No pre-filled lubricant. Oil-air forced circulation lubrication is mandatory for continuous ultra-high-speed operation. Special synthetic high-speed spindle grease can only be used temporarily for short commissioning. Install high-precision filter in lubrication circuit to keep oil clean; hard contaminants cause raceway scratches and ceramic ball damage. Do not mix different brands or types of lubricants.

5.4 Speed Parameter Note

Combination of 15° CD contact angle, GB outer-ring-guided cage and silicon nitride ceramic balls achieves excellent limiting DN performance. Ceramic balls have poor impact toughness; impact loads during operation must be avoided. Complete cooling system and sufficient speed safety margin are required for continuous full-speed operation to prevent axial overload.

6 Daily Maintenance & Fault Troubleshooting

Carry out multi-stage low-speed running-in after assembly. Do not increase speed to rated level until temperature rise and vibration remain stable. Open bearings have no built-in dust shield; reliable dust sealing must be installed on bearing housing.

Maintain continuous supply of clean lubricant to avoid dry friction damage caused by oil starvation. In case of continuous abnormal noise, overheating or sharp vibration increase, inspect sequentially: lubricant cleanliness, preload setting (prevent excessive preload), assembly coaxiality, matching accuracy of bearing faces, external axial impact load. Monitor operating temperature regularly to detect early signs of raceway fatigue and micro-cracks on ceramic balls.