32011 bearing: complete specifications & equivalents
The 32011 is a ISO 355 radial bearing sized 55 x 90 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 55 mm |
| Outer diameter D | 90 mm |
| Width B | 23 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) | 468 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 32011 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32000-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.906 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 225 mm |
| Width range across 32000-series | 15–48 mm |
| Bore position in 32000-series (smallest first) | 8 of 23 |
| Bore above smallest 32000-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32011 | 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 32011 model number is decoded
In the 32000-series the last two digits of 32011 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 355 envelope is 90 mm outside diameter and 23 mm total assembly width T over the separable cone and cup — 2.165 × 3.543 × 0.906 in, with a 17.5 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 55 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
- fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear
- 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
Selection pitfalls — read before you substitute
- On this 55 mm-bore 32011, 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 55 mm seat can seize hot.
- The 320 narrow series at 55 mm bore keeps the OD down to 90 mm for space-limited hubs; its 23 mm width carries less load than a 30211, so do not substitute it into a 302 application without re-rating.
- Check the shoulder geometry for 32011: a generous fillet on the 55 mm shaft looks strong but stops the 23 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 17.5 mm-section cup presses flush in the 90 mm housing.
- Never fit 32011 by tightening the adjuster to force the cone up the 55 mm taper — draw the nut to seat the rollers, then back it off; the 23 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.
- Relubrication for 32011 must reach the rib-roller end contact, not just the 55 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 23 mm-wide assembly or the sliding rib contact starves first.
- Tapered rollers accept virtually no misalignment; a deflected 55 mm shaft or a tilted housing shoulder concentrates load on one end of the 23 mm-wide roller row — align seats and verify housing perpendicularity.
- Press the 32011 cone onto the 55 mm shaft with force on the inner ring and the cup into the 90 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.
Frequently asked questions
What are the dimensions of a 32011 tapered roller bearing?
A 32011 single-row metric tapered roller bearing per ISO 355 has a 55 mm bore, 90 mm outer diameter and 23 mm total assembly width (2.165 × 3.543 × 0.906 in), a 17.5 mm radial section and roughly 468 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32011 bore code work?
The last two digits of 32011 are bore code 11, giving 11 × 5 = 55 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 90 mm OD and 23 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32011?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32011 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 32011 set?
At fit-up the 55 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 55 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 32011 take axial load in both directions?
A single 32011 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.