32209 bearing: complete specifications & equivalents
The 32209 is a ISO 355 radial bearing sized 45 x 85 x 24.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 45 mm |
| Outer diameter D | 85 mm |
| Width B | 24.75 mm |
| Seal / shield | open |
| Internal clearance | CN available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Operating temperature | -30 to +120 °C |
| Mass (geometry estimate) | 516 g |
| Standard | ISO 355 |
| Catalog version | iso355-geometry |
| Last verified | 2026-09-24 |
Source: ISO 15 boundary-dimensions standard · extracted 2026-09-24
Standard-interchange bearing: dimensions per ISO 15; CN clearance, P0 tolerance and a stamped-steel cage are catalogue defaults unless the supplier states otherwise, and mass is a geometry-derived estimate. Brand catalogue load ratings and limiting speeds for 32209 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32200-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 0.974 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 32200-series | 20 mm |
| Largest outer diameter in 32200-series | 200 mm |
| Width range across 32200-series | 19–56 mm |
| Bore position in 32200-series (smallest first) | 6 of 19 |
| Bore above smallest 32200-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32209 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 32209 model number is decoded
In the 32200-series the last two digits of 32209 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 355 envelope is 85 mm outside diameter and 24.75 mm total assembly width T over the separable cone and cup — 1.772 × 3.346 × 0.974 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.
Typical equipment & failure modes
Common applications
- final-drive pinion and differential bearings
- commercial gearbox input/output shafts
- conveyor head and tail pulleys
- fork-lift steer axles
- industrial transmission shafts
Known failure patterns
- cup creep and housing bore fretting when the outer ring is left without its specified press fit
- roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film
- raceway spalling at the roller-rib junction after the L10 life or sustained axial overload
- over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat
- under-preload end play that lets the rollers skid, producing noise and false brinelling
Selection pitfalls — read before you substitute
- On this 45 mm-bore 32209, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 45 mm seat can seize hot.
- The 322 medium series at 45 mm bore (85×24.75 mm) gains roller length and load over the 30209 on the same OD; the wider 24.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.
- The 24.75 mm-wide 32209 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 85 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.
- When mounting 32209 to a 45 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 85 mm assembly dents the tapered raceway before first run.
- Keep the 32209 pair matched through rebuilds; the 24.75 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 45 mm shaft alignment.
- The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.
- Tapered rollers accept virtually no misalignment; a deflected 45 mm shaft or a tilted housing shoulder concentrates load on one end of the 24.75 mm-wide roller row — align seats and verify housing perpendicularity.
Frequently asked questions
What are the dimensions of a 32209 tapered roller bearing?
A 32209 single-row metric tapered roller bearing per ISO 355 has a 45 mm bore, 85 mm outer diameter and 24.75 mm total assembly width (1.772 × 3.346 × 0.974 in), a 20.0 mm radial section and roughly 516 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32209 bore code work?
The last two digits of 32209 are bore code 09, giving 09 × 5 = 45 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 85 mm OD and 24.75 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32209?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32209 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other.
How is the preload or clearance of 32209 set?
At fit-up the 45 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 45 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure.
Can 32209 take axial load in both directions?
A single 32209 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness.
Reviewed & verified by the MPN Base engineering desk against source catalog iso355-geometry on 2026-09-24. Read our editorial & correction policy.