7230BDBD Back-to-Back Matched 30° Contact Angle Double Set Angular Contact Ball Bearing 150×270×90mm For Heavy Machine Tool Spindle & Industrial Reducer
7230BDBD is a back-to-back (DB) pre-matched double set angular contact ball bearing, composed of two 7230BD single-row bearings with 30° contact angle, overall dimension 150×270×90mm.
The DB pairing structure provides excellent tilting rigidity and strong overturning moment resistance, capable of bearing heavy radial load and bidirectional axial load simultaneously. Factory pre-adjusted clearance ensures direct installation without on-site debugging. It is widely used on heavy machine tool spindles, large reducers and construction machinery transmission systems requiring high rigidity.
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| Parameter | Value |
|---|---|
| Model | 7230BDBD (two sets of 7230BD in DB arrangement) |
| Inner Diameter (ID) | 150mm |
| Outer Diameter (OD) | 270mm |
| Single Bearing Width | 45mm |
| Total Assembly Width | 90mm |
| Contact Angle | 30° (BD type) |
| Structure | Back-to-back DB matched double set angular contact ball bearing, pressed steel cage |
| Material | GCr15 bearing steel |
| Basic Dynamic Load Cr (double set) | 375kN |
| Basic Static Load C0r (double set) | 490kN |
| Grease Limiting Speed | 2600 r/min |
| Total Weight | 22.4kg |
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- DB back-to-back pairing delivers outstanding tilting rigidity, strong resistance to overturning moment
- 30° large contact angle BD structure enhances bidirectional axial load capacity for heavy working conditions
- Factory pre-matched clearance, ready-to-install, saves on-site adjustment time and avoids assembly error
- Double set bearing arrangement shares load evenly, improves overall stability and service life
- Full heat treatment ensures high hardness, excellent wear resistance and fatigue performance
- Support customized preload grade, OEM laser marking and neutral export wooden case packaging
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This matched bearing set is widely used in:
- Heavy CNC machine tool spindles and milling head assemblies
- Large industrial gear reducers and heavy transmission systems
- Construction machinery rotary parts and heavy loading equipment
- Metallurgical rolling mill auxiliary roller assemblies
- High-power motor and pump bearing supports
???? Ideal for customers looking for high rigidity matched angular contact bearing solutions
- 25+ years experience manufacturing matched angular contact ball bearing assemblies
- Complete stock of 72 series BD single & DB/DF/DT matched bearing sets
- Strict pairing tolerance control, consistent preload and clearance for every set
- 100% dimensional, noise and load testing before shipment
- Professional technical matching support reply within 24 hours
- Stable mass supply for machine tool factories and reducer manufacturers
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- Raw material composition & hardness inspection
- Precision grinding and heat treatment process monitoring
- Contact angle tolerance and pairing clearance calibration test
- DB set tilting rigidity and preload consistency test
- Rotation noise and temperature rise endurance testing
- Anti-rust treatment and export wooden box packaging inspection before delivery
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Looking for reliable DB matched angular contact ball bearing supplier?
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- Fast quotation within 24 hours
- Engineer one-on-one equipment matching support
- Custom preload grade and clearance service
- Competitive factory bulk wholesale price
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Q1: Can you supply other matching types like DF or DT for 7230BD?
Yes, we provide DB back-to-back, DF face-to-face and DT tandem matched bearing sets.
Q2: What preload grades are available?
Light, medium and heavy preload grades are optional according to appliion requirements.
Q3: What is your delivery time?
Standard matched sets in stock: 3–7 days; custom preload bulk orders: 7–15 days based on quantity.
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