7209 bearing: complete specifications & equivalents
The 7209 is a ISO 15 radial bearing sized 45 x 85 x 19 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 85 mm |
| Width B | 19 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 38 kN |
| Basic static load rating C0 | 28.5 kN |
| Fatigue load limit Pu | 1.22 kN |
| Reference speed (thermal) | 9500 rpm |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 420 g |
| Manufacturer designation | SKF 7209 BECBP |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 7200-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 0.748 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 7200-series | 10 mm |
| Largest outer diameter in 7200-series | 540 mm |
| Width range across 7200-series | 9–85 mm |
| Bore position in 7200-series (smallest first) | 10 of 36 |
| Bore above smallest 7200-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 7209-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 6209 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Identical envelope but a different bearing type — confirm load and speed suitability before substitution. |
| 6209-2RS | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Identical envelope but a different bearing type — confirm load and speed suitability before substitution. |
| 6209-ZZ | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Identical envelope but a different bearing type — confirm load and speed suitability before substitution. |
| 7209-BE-2RZP | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 7209 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable. |
| 7209-BECBP | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 7209 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable. |
| 7209-BEGAPH | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 7209 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable. |
| 7209-BECBM | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 7209 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable. |
| 7209-BECBY | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 7209 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable. |
| 7209-ACCBM | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF 7209 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check. |
| QJ-209-MA | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF QJ 209 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 7209 model number is decoded
Ordering number 7209 BECBP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 45 mm shaft, light (7200) series, with an open PA66-caged execution and one-direction axial capacity.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 2 is ISO diameter series 2 (light section), and the last two digits encode the 45 mm bore; the 85 mm OD and 19 mm width follow the ISO 15 general plan. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. As a CB execution the rings are delivered match-ready: face-to-face or back-to-back pairs can be assembled without regrinding, and Normal (CB) clearance suits general preloaded pairs — GA/GB/GC suffixes would denote factory-set light/medium preload. Speed planning uses two different ceilings: 9,500 r/min reference (thermal, under representative load) and 10,000 r/min limiting (mechanical cage/ball limit). Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7209 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.
Typical equipment & failure modes
Common applications
- servo drives and precision gearboxes
- gear pumps and screw-type pumps
- centrifugal and vacuum pumps
- automotive and industrial transmissions
Known failure patterns
- contamination wear through the open arrangement when no external seal is provided
- raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse
- fretting at the ground set faces of a pair whose clamp torque relaxes in service
- thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand
- cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7209 pair heats, loses preload control and smears the raceways.
- The 72xx light section at 45 mm bore is the general-purpose angular-contact envelope (85×19 mm); stepping up to a 7309 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.
- DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7209 mounting error.
- Do not mix execution classes inside one 7209 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.
- Catalogue reference speed and limiting speed are different limits: the 9,500 r/min reference is a thermal criterion under load, while the 10,000 r/min limiting value is the mechanical ceiling — observe both.
- The 38/28.5 kN ratings are SKF catalogue 17000 values for the 7209 BECBP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 7209 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7209 BECBP designation when purchasing and match the execution to the mounting arrangement.
- The CB execution (7209 BECBP) ships prepared for pair mounting but is not a matched set by itself: preload results from how the pair is clamped, so follow the SKF stand-off-ring and nut-torque procedure rather than assuming the bearings arrive preloaded.
Frequently asked questions
What are the dimensions and catalogue data of SKF 7209?
The SKF 7209 BECBP is a single-row angular-contact ball bearing with 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 38 kN, C0 28.5 kN, fatigue load limit Pu 1.22 kN, reference speed 9,500 r/min, limiting speed 10,000 r/min, mass about 420 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 9,500 r/min as catalogue conditions, not a guarantee in the housing.
How does the 7209 bore code work?
The last two digits of 7209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 19 mm width come from the ISO 15 diameter-series plan, shared with the 6209 deep-groove envelope.
What do the 72xx and BECBP designations mean?
The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. CB adds Normal axial clearance with ground faces for universal DB/DF/DT pair mounting. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust.
Can a single 7209 take axial load in both directions?
No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight.
How does 7209 compare with a deep-groove 6209?
Both use the 45×85×19 mm ISO 15 envelope, but the angular-contact 7209 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7209 design to perform.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB on 2026-09-26. Read our editorial & correction policy.