32015 bearing: complete specifications & equivalents
The 32015 is a ISO 355 radial bearing sized 75 x 115 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 75 mm |
| Outer diameter D | 115 mm |
| Width B | 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) | 761 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 32015 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32000-series range
| Bore d | 2.953 in |
|---|---|
| Outer diameter D | 4.528 in |
| Width B | 0.984 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 20 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) | 12 of 23 |
| Bore above smallest 32000-series size | 55 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32015 | 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 32015 model number is decoded
In the 32000-series the last two digits of 32015 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 355 envelope is 115 mm outside diameter and 25 mm total assembly width T over the separable cone and cup — 2.953 × 4.528 × 0.984 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 75 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
- industrial transmission shafts
- light-truck and van wheel hubs
- final-drive pinion and differential bearings
- commercial gearbox input/output shafts
- conveyor head and tail pulleys
Known failure patterns
- 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
- fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear
Selection pitfalls — read before you substitute
- On this 75 mm-bore 32015, 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 75 mm seat can seize hot.
- The 320 narrow series at 75 mm bore keeps the OD down to 115 mm for space-limited hubs; its 25 mm width carries less load than a 30215, so do not substitute it into a 302 application without re-rating.
- The 25 mm-wide 32015 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 115 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.
- When mounting 32015 to a 75 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 115 mm assembly dents the tapered raceway before first run.
- Inspect the removed 32015 cone and cup as a pair: pitting on the 115 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 75 mm cone points to wrong preload or lost EP film — the two faults need different corrections.
- A single 32015 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.
- The cone and the cup of 32015 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 32015 tapered roller bearing?
A 32015 single-row metric tapered roller bearing per ISO 355 has a 75 mm bore, 115 mm outer diameter and 25 mm total assembly width (2.953 × 4.528 × 0.984 in), a 20.0 mm radial section and roughly 761 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32015 bore code work?
The last two digits of 32015 are bore code 15, giving 15 × 5 = 75 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 115 mm OD and 25 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32015?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32015 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 32015 set?
At fit-up the 75 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 75 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 32015 take axial load in both directions?
A single 32015 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.