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7209 Angular Contact Ball Bearing Specifications
| Designation | 7209 |
|---|---|
| Series | 7200 series, single row angular contact |
| Bore diameter (d) | 45 mm |
| Outer diameter (D) | 85 mm |
| Width (B) | 19 mm |
| Contact angle | Specify C (15 degrees), AC (25 degrees) or B (40 degrees) |
| Standard | ISO 15 boundary dimensions; ISO 492 tolerance classes |
Overview
The 7209 is a single row angular contact ball bearing with a 45 mm bore, 85 mm outer diameter and 19 mm width. The line of action through the balls is offset from the radial plane, so the bearing carries combined radial and axial load. A single row bearing takes axial load in one direction only, so it is normally mounted opposed by a second bearing.
Contact angle selection
The same 7209 envelope is produced with different contact angles, and the angle determines what the bearing can do. A 15 degree version suits high speed with light axial load. A 25 degree version is the general-purpose compromise for machine tools and pumps. A 40 degree version carries the highest axial load at moderate speed. Specify the angle when ordering, because the designation suffix differs between makers.
Arrangements
Back-to-back (DB) gives the highest resistance to tilting moments and suits spindles and gearbox shafts. Face-to-face (DF) tolerates more misalignment and has lower moment rigidity. Tandem (DT) doubles axial capacity in one direction. Matched pairs are supplied with light, medium or heavy preload.
Typical applications
- Machine tool spindles
- Centrifugal and screw pumps
- Gearbox and reducer shafts
- Compressors
- Automotive driveline components
Cross-reference
Dimensionally interchangeable with SKF, NSK, FAG and NTN 7209 bearings. Brand names are used for cross-reference only; Ultrabearing is an independent manufacturer and is not affiliated with these brands.
Frequently asked questions
What are the dimensions of a 7209 bearing?
A 7209 angular contact ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width.
Can a single 7209 carry axial load in both directions?
No. A single row bearing takes axial load in one direction only. Use a pair in DB or DF arrangement, or a double row bearing, when thrust can reverse.
Load ratings, preload and lead time: send the part number, contact angle and application details, and we confirm the rating and delivery schedule within 24 hours.
