Ball Bearings
Angular Contact Ball Bearings
BOM manufactures angular contact ball bearings in three product families: single-row 7000/7200/7300 series for combined radial and unidirectional axial loads, QJ series four-point contact bearings that handle bidirectional axial loads in a single compact row, and precision matched pairs in DB/DF/DT arrangements for machine tool spindles and high-rigidity positioning applications. Contact angles from 15° to 40° are available across all series. Full-specification custom manufacturing is available, including non-standard dimensions, special materials, and integrated bearing assemblies.
Key Features
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Single-Row Series: 7000 (compact, highest speed), 7200 (balanced load and speed), 7300 (heaviest cross-section, maximum combined load)
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Four-Point Contact (QJ): Single row replaces two paired bearings for bidirectional axial loads in a fraction of the axial space
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Matched Pair Arrangements: DB (back-to-back, maximum moment stiffness), DF (face-to-face, accommodates shaft deflection), DT (tandem, doubled unidirectional thrust)
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Contact Angle Range: 15° to 40° selectable to match the axial-to-radial load ratio of the application
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Precision Preload: Light, medium, and heavy preload options for spindle speed, rigidity, and thermal requirements
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Full-Specification Custom Manufacturing Available
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Description
Reviews
Single Row Angular Contact Ball Bearing
7000 / 7200 / 7300 Series Customizable
Single-row angular contact ball bearings handle simultaneous radial and unidirectional axial loads through an inclined contact angle between the ball and raceway. BOM manufactures the full range of standard series: 7000 (compact cross-section, highest speed), 7200 (larger cross-section, higher load capacity), and 7300 (heaviest cross-section, maximum combined load). Contact angles from 15° to 40° are available to match the axial-to-radial load ratio of each application.
- Load Type: Simultaneous radial and axial load capacity, with the contact angle selected to balance axial capacity against speed rating for the specific duty
- Series Selection: 7000 for maximum speed and minimum envelope, 7200 for balanced load and speed performance, 7300 for maximum combined load capacity in heavy-duty applications
- Contact Angle: 15° for high-speed with low axial loads, 25° for general-purpose combined loads, 40° for heavy axial loads at moderate speeds
- Mounting Arrangements: Single or paired in DB (back-to-back), DF (face-to-face), or DT (tandem) configuration for bidirectional axial rigidity or increased unidirectional thrust
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Four-Point Contact Ball Bearing
Bi-directional Axial Customizable
QJ series four-point contact ball bearings use a single row of balls with four-point raceway contact geometry to handle bidirectional axial loads and moderate radial loads, replacing two paired single-row bearings in a fraction of the axial space.
- Load Type: Single row handles bidirectional axial and moderate radial loads via four-point ball-raceway contact
- Space Efficiency: Replaces two paired single-row angular contact bearings in significantly less axial space
- Application Fit: Designed for axial-dominant loads, ideal for vertical shafts, gearbox input stages, and indexing axes
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Matched Pair Angular Contact Ball Bearings
High Precision Pre-loaded
DB/DF/DT arranged matched pairs are pre-loaded and pre-assembled for high-precision applications, eliminating axial play and providing superior rigidity for demanding industrial and machine tool spindle applications.
- Arrangement Strategy: Back-to-Back (DB) maximizes moment resistance for cantilevered loads; Face-to-Face (DF) accommodates shaft deflection in rigid housings; Tandem (DT) doubles unidirectional thrust capacity. Select based on load direction and shaft flexibility
- Preload Engineering: Light minimizes friction and heat for high-speed spindles; Medium balances rigidity and speed for general precision work; Heavy delivers maximum stiffness for heavy interrupted cutting or sustained thrust. Preload directly affects bearing life and thermal behavior
- Series Coverage: 7000, 7200, 7300 single-row types available in matched pair configurations; choose 7000 for maximum speed, 7200 for balanced load/speed, 7300 for highest radial and axial capacity in compact form
- Application Fit: Optimized for machine tool spindles, semiconductor wafer positioning stages, precision servo drives, and high-speed rotary tables where rigidity, thermal stability, and sub-micron repeatability are non-negotiable
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Angular Contact Ball Bearings: Dimensions & Load Ratings
7000, 7200, and 7300 series shown (25° contact angle, AC designation) | Boundary dimensions per ISO 15 | Contact us for sizes not shown
| Designation |
d mm |
D mm |
B mm |
Cr kN |
C0r kN |
|---|
Applications
Machine Tool Spindles
High-speed precision for CNC lathes, milling machines, and grinding spindles with exceptional rigidity and accuracy requirements.
Pumps & Compressors
Combined radial and thrust load support for industrial fluid handling equipment operating under continuous demanding loads.
Gearboxes & Power Transmission
High-load transmission systems requiring combined radial and axial capacity in industrial and renewable energy applications.
Robotics & Precision Equipment
High accuracy positioning for robotic arms, indexing tables, and measuring instruments requiring precision and repeatability.
About BOM Bearing
BOM Bearing is a professional manufacturer of high-quality angular contact ball bearings, delivering precision-engineered solutions for demanding industrial applications worldwide.
- Quality Assurance: ISO 9001, IATF 16949, and ISO 14001 certified; quality and environmental standards validated at every production stage
- Wide Size Range: 7000, 7200, 7300 single-row series plus four-point contact and matched pair configurations, providing comprehensive angular contact ball bearing coverage for precision and heavy-duty applications
- Custom Manufacturing: Full-specification customization from non-standard dimensions and alternative materials to specialized coatings and complete bearing architecture redesign, engineered to your exact requirement
- Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery
- Technical Support: Engineering team available for application analysis, bearing selection, and custom specification development
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Frequently Asked Questions (FAQ)
What contact angle should I choose?
15° contact angle for high-speed applications with low axial loads. 25° for general-purpose applications with moderate combined loads. 40° for heavy axial loads and lower speeds. Higher contact angles provide greater axial load capacity but reduce maximum speed limits.
What is the difference between DB, DF, and DT arrangements?
DB (back-to-back) arrangement handles moments and bidirectional axial loads with wide effective spacing. DF (face-to-face) has narrow spacing and accommodates shaft deflection. DT (tandem) arrangement doubles unidirectional axial load capacity for extreme thrust requirements.
Can angular contact bearings handle pure radial loads?
Single-row angular contact bearings generate an induced axial force under radial loading and must always be mounted in opposing pairs or against a second locating bearing. For applications requiring bidirectional axial capacity in a single unit, QJ series four-point contact bearings handle combined radial and bidirectional axial loads without pairing.
Can angular contact bearings be supplied as matched pairs for specific applications?
Yes. BOM manufactures matched pairs configured in DB (back-to-back), DF (face-to-face), and DT (tandem) arrangements, pre-loaded and pre-assembled for high-precision applications. Each configuration is optimized to match your specific load direction, shaft flexibility, and application requirements, delivering superior rigidity and eliminating axial play for demanding spindle and positioning work.
Can BOM provide custom angular contact ball bearings?
Yes. BOM manufactures full-specification custom angular contact ball bearings, from non-standard dimensions and alternative materials to specialized coatings and complete bearing architecture redesign. Whether you need a modified contact geometry, a non-catalog bore size, or an integrated assembly combining bearing and mating components as a single precision-machined unit, our engineering team works directly with your application requirements. Contact us with your specifications for a detailed proposal.
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