32305 bearing: complete specifications & equivalents
The 32305 is a ISO 355 radial bearing sized 25 x 62 x 25.25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 25 mm |
| Outer diameter D | 62 mm |
| Width B | 25.25 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) | 326 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 32305 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32300-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.994 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 18.5 mm |
| Smallest bore in 32300-series | 20 mm |
| Largest outer diameter in 32300-series | 240 mm |
| Width range across 32300-series | 22.25–84.5 mm |
| Bore position in 32300-series (smallest first) | 2 of 19 |
| Bore above smallest 32300-series size | 5 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32305 | 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 32305 model number is decoded
In the 32300-series the last two digits of 32305 encode the bore: code 05 = 25 mm (code × 5 from 04 upward). The ISO 355 envelope is 62 mm outside diameter and 25.25 mm total assembly width T over the separable cone and cup — 0.984 × 2.441 × 0.994 in, with a 18.5 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 25 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
- agricultural implement wheels
- passenger-car wheel hubs
- small trailer axles
- light differential pinions
- steering knuckles
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
- At 25 mm bore the small 32305 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 25 mm shaft) or the wheel runs hot within the first hundred kilometres.
- The 323 heavy wide series at 25 mm bore (62×25.25 mm) is a steep-angle, high-thrust row for heavy final drives; its 18.5 mm section and 25.25 mm width dwarf the 30205, and its speed ceiling is the lowest of the four series.
- Check the shoulder geometry for 32305: a generous fillet on the 25 mm shaft looks strong but stops the 25.25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 18.5 mm-section cup presses flush in the 62 mm housing.
- Never fit 32305 by tightening the adjuster to force the cone up the 25 mm taper — draw the nut to seat the rollers, then back it off; the 25.25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.
- Keep the 32305 pair matched through rebuilds; the 25.25 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 25 mm shaft alignment.
- A single 32305 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 323-series pair adjusted against each other.
- The cone and the cup of 32305 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.
Frequently asked questions
What are the dimensions of a 32305 tapered roller bearing?
A 32305 single-row metric tapered roller bearing per ISO 355 has a 25 mm bore, 62 mm outer diameter and 25.25 mm total assembly width (0.984 × 2.441 × 0.994 in), a 18.5 mm radial section and roughly 326 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32305 bore code work?
The last two digits of 32305 are bore code 05, giving 05 × 5 = 25 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 62 mm OD and 25.25 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32305?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32305 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 32305 set?
At fit-up the 25 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 25 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 32305 take axial load in both directions?
A single 32305 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.