32016 bearing: complete specifications & equivalents
The 32016 is a ISO 355 radial bearing sized 80 x 125 x 29 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 80 mm |
| Outer diameter D | 125 mm |
| Width B | 29 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) | 1072 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 32016 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32000-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 4.921 in |
| Width B | 1.142 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 22.5 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) | 13 of 23 |
| Bore above smallest 32000-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32016 | 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 32016 model number is decoded
In the 32000-series the last two digits of 32016 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 355 envelope is 125 mm outside diameter and 29 mm total assembly width T over the separable cone and cup — 3.15 × 4.921 × 1.142 in, with a 22.5 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 80 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
- truck and trailer wheel hubs
- heavy final drives and differentials
- large conveyor drum pulleys
- crane travel wheels and winch drums
- railway axle boxes
Known failure patterns
- 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
- cup creep and housing bore fretting when the outer ring is left without its specified press fit
Selection pitfalls — read before you substitute
- The large 80 mm-bore 32016 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 80 mm shaft.
- The 320 narrow series at 80 mm bore keeps the OD down to 125 mm for space-limited hubs; its 29 mm width carries less load than a 30216, so do not substitute it into a 302 application without re-rating.
- Before fitting 32016, machine the 80 mm shaft seat and 125 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 29 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 22.5 mm radial section.
- The 32016 cup drives into the 125 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 29 mm load zone.
- Keep the 32016 pair matched through rebuilds; the 29 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 80 mm shaft alignment.
- The cone and the cup of 32016 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.
- Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 80 mm-bore 32016 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.
Frequently asked questions
What are the dimensions of a 32016 tapered roller bearing?
A 32016 single-row metric tapered roller bearing per ISO 355 has a 80 mm bore, 125 mm outer diameter and 29 mm total assembly width (3.15 × 4.921 × 1.142 in), a 22.5 mm radial section and roughly 1072 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32016 bore code work?
The last two digits of 32016 are bore code 16, giving 16 × 5 = 80 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 125 mm OD and 29 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32016?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32016 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 32016 set?
At fit-up the 80 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 0.05–0.20 mm for a 80 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 32016 take axial load in both directions?
A single 32016 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.