32010 bearing: complete specifications & equivalents
The 32010 is a ISO 355 radial bearing sized 50 x 80 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 50 mm |
| Outer diameter D | 80 mm |
| Width B | 20 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) | 313 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 32010 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32000-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.787 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 15 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) | 7 of 23 |
| Bore above smallest 32000-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32010 | 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 32010 model number is decoded
In the 32000-series the last two digits of 32010 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 355 envelope is 80 mm outside diameter and 20 mm total assembly width T over the separable cone and cup — 1.969 × 3.15 × 0.787 in, with a 15.0 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 50 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
- light-truck and van wheel hubs
- final-drive pinion and differential bearings
- commercial gearbox input/output shafts
- conveyor head and tail pulleys
- fork-lift steer axles
Known failure patterns
- false brinelling from vibration while the axle is stationary during transport
- 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
Selection pitfalls — read before you substitute
- On this 50 mm-bore 32010, 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 50 mm seat can seize hot.
- The 320 narrow series at 50 mm bore keeps the OD down to 80 mm for space-limited hubs; its 20 mm width carries less load than a 30210, so do not substitute it into a 302 application without re-rating.
- Before fitting 32010, machine the 50 mm shaft seat and 80 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 20 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 15.0 mm radial section.
- The 32010 cup drives into the 80 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 20 mm load zone.
- Keep the 32010 pair matched through rebuilds; the 20 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 50 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 50 mm shaft or a tilted housing shoulder concentrates load on one end of the 20 mm-wide roller row — align seats and verify housing perpendicularity.
Frequently asked questions
What are the dimensions of a 32010 tapered roller bearing?
A 32010 single-row metric tapered roller bearing per ISO 355 has a 50 mm bore, 80 mm outer diameter and 20 mm total assembly width (1.969 × 3.15 × 0.787 in), a 15.0 mm radial section and roughly 313 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32010 bore code work?
The last two digits of 32010 are bore code 10, giving 10 × 5 = 50 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 80 mm OD and 20 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32010?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32010 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 32010 set?
At fit-up the 50 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 50 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 32010 take axial load in both directions?
A single 32010 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.