120BER10HDBD Angular Contact Ball Bearing 120x180x28 10‑Degree DB Back‑to‑Back P4 Matched Spindle Set

1. Product Overview

120BER10HDBD is ultra‑high‑speed P4 precision single‑row angular contact ball bearing matched set in DB back‑to‑back arrangement. Single bearing dimension:120 mm bore × 180 mm OD × 28 mm width, 10‑degree low contact angle optimized for ultra‑high‑speed operation.
Suffix explanation:
‑ BER10: 10‑degree contact angle, special internal geometry for ultra‑high‑speed performance;
‑ H: Phenolic resin moulded cage, ball‑guided;
‑ D: Factory defined medium preload;
‑ BD: DB back‑to‑back two‑piece factory matched set.

Open‑type structure, designed for oil‑air lubrication. Manufactured with fully quenched GCr15 bearing steel. DB back‑to‑back pairing provides high tilting‑moment rigidity. Factory preset medium preload eliminates customer on‑site shimming and preload adjustment work. Suited for large high‑speed machine‑tool spindles, grinding machine main spindles, high‑speed rotary test equipment and other high‑end machinery requiring P4 precision, ultra‑high‑speed capability and defined preload.

2. Technical Specifications

Mounting‑shoulder drawing, preload parameter sheet and ultra‑high‑speed performance test reports can be provided upon customer request.

3. Core Advantages

• 10‑degree low contact angle: Optimized geometry for ultra‑high‑speed operation, reduces centrifugal force of rolling elements, achieves extremely high limiting speed under oil‑air lubrication.
• P4 ultra‑precision grade: Strict dimensional, geometric and run‑out tolerances, meets large high‑speed spindle accuracy requirements.
• DB back‑to‑back factory‑matched pair: High tilting‑moment rigidity, stable performance under combined radial‑axial offset load.
• D factory preset medium preload: Preload value strictly controlled in factory. Direct installation without manual shimming, reduces assembly error on site.
• BER special internal design: Optimized raceway and ball contact pattern, low heat generation for continuous ultra‑high‑speed running.
• Phenolic resin H cage: Excellent high‑speed stability, low friction and vibration resistance for long‑cycle precision spindle operation.
• Open‑type construction specially adapted for oil‑air lubrication system, not recommended for long‑term grease lubrication.
• Dimensionally interchangeable with international‑standard 120BER10HDBD matched sets. Rich custom options: light / heavy preload variant, P2 precision upgrade, OEM laser marking, neutral export anti‑rust carton.

4. Application Scenarios

120BER10HDBD P4‑precision DB back‑to‑back medium‑preload ultra‑high‑speed angular‑contact ball‑bearing set is high‑end precision rotary spare‑part for 120 mm‑shaft industrial‑equipment:

• Large‑size high‑speed machine‑tool spindle rotary support assemblies
• Heavy‑duty grinding machine main spindle bearing units
• Ultra‑high‑speed dynamic rotary test‑bench spindle assemblies
• High‑rigidity large‑format precision processing equipment
• Other precision machinery requiring P4 accuracy, 10‑degree high‑speed geometry, DB back‑to‑back arrangement and factory‑set D medium preload

Aftermarket interchangeable BER‑series P4‑precision factory‑matched DB angular‑contact ball‑bearing set
Ultra‑high‑speed low‑run‑out spindle bearing solution for large spindle manufacturers, grinding‑machine OEMs and high‑end equipment bulk‑maintenance procurement.

5. Why Choose GQZ Bearing

• 25‑years manufacturing experience of ultra‑high‑speed precision matched‑set angular‑contact ball‑bearings including 120BER10HDBD.
• 120BER10HDBD matched‑set is dimension‑for‑dimension interchangeable with international‑standard counterparts, consistent P4‑precision tolerance, DB‑matching accuracy and D medium‑pre‑load control standards.
• Complete OEM & ODM custom service covering alternative preload grades, P2 precision upgrade and special‑processing requirements.
• Strict pre‑shipment QC: GCr15 raw‑material metallurgy & hardness inspection, ball‑sorting, ultra‑precision raceway super‑finishing, matched‑set pairing‑screening, D pre‑load verification test, ultra‑high‑speed temperature‑rise aging test.
• Professional spindle‑bearing engineering team provides one‑on‑one radial‑axial combined‑load calculation, shaft‑housing fit‑tolerance guidance and DB‑set installation tips within 24 working hours.
• Large‑scale precision‑production workshop offers competitive factory‑direct bulk‑wholesale price, stable long‑term supply for global large spindle, grinding‑machine and high‑end precision‑equipment spare‑part buyers.
• We focus on BER‑series ultra‑high‑speed P4/P2 precision factory‑matched angular‑contact ball‑bearing sets, controlled‑preload pairing‑technology, ISO‑metric‑precision‑dimension standards, pursuing win‑win long‑term cooperation with high‑speed precision‑transmission‑equipment suppliers.

6. Quality Control

• Raw‑material chemical‑composition, internal‑defect and hardness inspection for GCr15 inner‑ring, outer‑ring and steel‑ball blanks
• Precision turning, multiple stress‑relief tempering, ultra‑precision super‑finish grinding for inner‑outer raceway surfaces for P4‑precision requirements
• Steel‑ball high‑temperature quenching, mirror‑polishing and high‑precision auto‑sorting production‑line
• Phenolic‑resin H‑cage moulding & finishing, single‑bearing dimensional‑tolerance & run‑out inspection
• Strict pairing‑screening procedure for DB back‑to‑back set; D medium‑pre‑load value verification one‑by‑one for every matched‑set
• Targeted performance‑tests:120BER10HDBD matched‑set ultra‑high‑speed temperature‑rise rotation aging test, moment‑stiffness simulation‑detection, pre‑load stability check
• Full re‑check for dimension‑tolerance, 10‑degree contact‑angle, matching‑mark and pre‑load parameter before anti‑rust‑oil coating and export moisture‑proof‑carton packing.

Each production batch of 120BER10HDBD undergoes large spindle‑simulation cyclic‑rotation test to guarantee stable low‑run‑out ultra‑high‑speed rotary‑support performance for 120‑mm‑shaft high‑end industrial‑transmission‑systems.

7. Get A Quote Now

If you need 120BER10HDBD P4‑precision DB back‑to‑back matched angular‑contact ball‑bearing sets for large‑spindle manufacturing, grinding‑machine‑assembly and high‑end‑equipment‑maintenance bulk‑matching, send your purchase‑inquiry directly.
Full professional supporting‑services after inquiry submission:

• Official formal quotation reply within 24 working‑hours
• One‑on‑one radial‑&‑axial‑combined‑load calculation, shaft‑housing‑fit‑tolerance guidance and DB‑matched‑set installation technical‑support from professional‑precision‑bearing‑engineers
• Custom‑bearing‑performance‑upgrade options including P2‑precision‑grade and alternative pre‑load values
• Favorable factory‑direct bulk‑wholesale price for large‑volume 120BER10HDBD single‑model‑orders

Please provide purchase‑quantity, working‑conditions (ultra‑high‑speed / high‑stiffness / oil‑air lubrication) and continuous‑operating‑temperature to get detailed official‑quotation‑documents.

8. FAQ