1 Complete Model & Code Explanation

Model: 7013 CD/HCP4AQBCC

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, low axial load capacity, top-tier limiting speed performance

HC: Hybrid Ceramic, silicon nitride Si₃N₄ rolling elements, insulation against electrocorrosion, low density to reduce high-speed centrifugal force

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

QBCC: Machined solid brass cage with inner ring guidance, excellent stability at ultra-high speed, lower cage spin heat

Supply form: Independent single bearing without factory pairing marks, spacer excluded, supports on-site DB/DF/DT matching

Comparative Reference Models

15° hybrid ceramic brass cage single: 7013 CD/HCP4AQBCC

20° hybrid ceramic factory DT matched set: 7013 ACE/HCP4ADT

20° all-steel reinforced large ball single: 7013 ACEGB/P4A

25° hybrid ceramic single unit: 7013 ACDGC/HCP4AL

Core Basic Dimensions

Bore d: 65 mm

Outer diameter D: 100 mm

Width B: 18 mm

Contact angle: 15°

Structure: Single row open-type single bearing without seal

Rolling element: High-purity silicon nitride Si₃N₄ ceramic balls

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

Cage: QBCC machined brass cage (inner ring guided)

Pre-filled lubricant: None

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

Delivery form: Individually packed single unit, spacers to be purchased 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

Pairing property: Loose single unit without factory pairing label; face height sorting required before on-site DB/DF/DT assembly

Precision class: P4A ultra-precision grade

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

Seal structure: Open type, non-sealed

Note: CD 15° ultra-low contact angle targets ultra-high-speed light-load applications. Compared with 20° ACE and 25° ACD versions, it delivers minimum friction and highest limiting DN at high speed while offering the weakest axial load capacity, not suitable for heavy cutting. Equipped with HC silicon nitride ceramic balls to avoid raceway electrocorrosion caused by shaft current in built-in motor spindles. QBCC solid brass cage features higher rigidity and less vibration than pressed cages, suitable for continuous ultra-high rotation. Open design is exclusively for oil-air lubrication, long-term sealed grease operation is prohibited. Supplied as single bearing. Face height sorting is mandatory for multi-bearing arrangement and cannot directly replace factory pre-matched sets.

2 Structure & Operating Characteristics

Japan NMT 7013 CD/HCP4AQBCC adopts standard 7013 mounting dimensions, CD 15° ultra-low contact angle, HC silicon nitride ceramic balls and QBCC precision brass cage. Inner and outer rings are manufactured from high-carbon chromium bearing steel with stabilized heat treatment, multi-stage aging and ultra-precision mirror raceway grinding. Ceramic balls undergo strict size sorting and ultra-smooth polishing. The brass cage is precision turned with optimized clearance to suppress cage oscillation and frictional heat under ultra-high speed.

Compared with 20° / 25° contact angle bearings, the 15° CD design reduces axial force and ball spin torque. Low-density ceramic balls cut centrifugal load significantly and extend available speed range. Solid brass cage possesses good thermal conductivity for continuous high-speed heat dissipation. The disadvantage lies in limited axial load capacity; heavy axial load easily distorts contact ellipse, so only light cutting & finishing work is applicable. Single-unit supply enables flexible front-rear support layout design.

3 Core Performance Advantages

1. CD 15° ultra-high-speed optimized contact angle: Lowest friction loss at high speed, superior limiting DN compared with ACE 20° and ACD 25° series for prolonged continuous ultra-high-speed operation.

2. HC silicon nitride hybrid ceramic rolling elements: Insulating property prevents electrocorrosion inside built-in motor spindles; low density reduces centrifugal load and suppresses temperature rise.

3. QBCC machined brass cage (inner ring guidance): High structural rigidity, low vibration and excellent thermal conductivity, more reliable than stamped cages for long-term ultra-high-speed stable running.

4. P4A ultra-precision grade: Strict control of rotational runout to maintain consistent spindle accuracy at extreme rotating speed.

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

6. Independent single-unit supply: No bundled spacers; machine builders freely select DB, DF or DT layout and design preload spacers independently.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

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

For multi-bearing support arrangement, on-site face height sorting and matching are mandatory. Random assembly without sorting leads to uneven load, increased vibration and local overheating failure.

5.2 Pairing & Preload Instructions

Supply condition: Independent single bearing without pairing marks, spacers excluded.

Available layout: DB back-to-back, DF face-to-face, DT tandem.

Recommended preload: Light preload is preferred for ultra-high-speed finishing; medium or heavy preload is forbidden under maximum speed operation.

Selection reference:

① Heavy cutting & large axial load → select ACD 25° contact angle series

② Balanced speed & medium cutting capacity → select ACE 20° contact angle series

③ Maximum speed priority, light cutting, built-in motor spindle →7013 CD/HCP4AQBCC (15° hybrid ceramic brass cage)

5.3 Lubrication Matching Scheme

No pre-filled lubricant. Oil-air forced circulation lubrication must be adopted for continuous ultra-high-speed operation. Grease lubrication is not recommended at extreme rotating speed; special high-speed spindle synthetic grease can only be used temporarily for short commissioning. Install high-precision filter in lubrication circuit to keep oil clean; hard contaminants easily scratch ceramic balls and raceways. Do not mix lubricants of different brands or types.

5.4 Speed Parameter Note

The combination of 15° CD contact angle and hybrid ceramic balls achieves the best limiting DN performance within this product line. However, axial bearing capacity is weak; large axial impact load accelerates bearing fatigue. Complete cooling system and sufficient speed safety margin are required for continuous full-speed operation to avoid 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, bearing matching accuracy and external axial impact load. Monitor operating temperature regularly to detect early signs of electrocorrosion and contact fatigue.