32006 bearing: complete specifications & equivalents
The 32006 is a ISO 355 radial bearing sized 30 x 55 x 17 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 30 mm |
| Outer diameter D | 55 mm |
| Width B | 17 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) | 145 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 32006 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32000-series range
| Bore d | 1.181 in |
|---|---|
| Outer diameter D | 2.165 in |
| Width B | 0.669 in |
| ISO bore code | 06 |
| Radial section height (D−d)/2 | 12.5 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) | 3 of 23 |
| Bore above smallest 32000-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32006 | 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 32006 model number is decoded
In the 32000-series the last two digits of 32006 encode the bore: code 06 = 30 mm (code × 5 from 04 upward). The ISO 355 envelope is 55 mm outside diameter and 17 mm total assembly width T over the separable cone and cup — 1.181 × 2.165 × 0.669 in, with a 12.5 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 30 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 differential pinions
- steering knuckles
- small gearbox shafts
- agricultural implement wheels
- passenger-car wheel hubs
Known failure patterns
- 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
- water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path
- false brinelling from vibration while the axle is stationary during transport
Selection pitfalls — read before you substitute
- At 30 mm bore the small 32006 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 30 mm shaft) or the wheel runs hot within the first hundred kilometres.
- The 320 narrow series at 30 mm bore keeps the OD down to 55 mm for space-limited hubs; its 17 mm width carries less load than a 30206, so do not substitute it into a 302 application without re-rating.
- The 17 mm-wide 32006 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 30 mm bore and 55 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 12.5 mm section.
- When mounting 32006 to a 30 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 55 mm assembly dents the tapered raceway before first run.
- Inspect the removed 32006 cone and cup as a pair: pitting on the 55 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 30 mm cone points to wrong preload or lost EP film — the two faults need different corrections.
- Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.
- A single 32006 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other.
Frequently asked questions
What are the dimensions of a 32006 tapered roller bearing?
A 32006 single-row metric tapered roller bearing per ISO 355 has a 30 mm bore, 55 mm outer diameter and 17 mm total assembly width (1.181 × 2.165 × 0.669 in), a 12.5 mm radial section and roughly 145 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32006 bore code work?
The last two digits of 32006 are bore code 06, giving 06 × 5 = 30 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 55 mm OD and 17 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32006?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32006 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 32006 set?
At fit-up the 30 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 0.02–0.10 mm for a 30 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 32006 take axial load in both directions?
A single 32006 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.