32026 bearing: complete specifications & equivalents
The 32026 is a ISO 355 radial bearing sized 130 x 200 x 45 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 130 mm |
| Outer diameter D | 200 mm |
| Width B | 45 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) | 4166 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 32026 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32000-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.772 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 35 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) | 21 of 23 |
| Bore above smallest 32000-series size | 110 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32026 | 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 32026 model number is decoded
In the 32000-series the last two digits of 32026 encode the bore: code 26 = 130 mm (code × 5 from 04 upward). The ISO 355 envelope is 200 mm outside diameter and 45 mm total assembly width T over the separable cone and cup — 5.118 × 7.874 × 1.772 in, with a 35.0 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 130 mm shaft, typical catalogue practice is a m6 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
- railway axle boxes
- agricultural tractor axles
- truck and trailer wheel hubs
- heavy final drives and differentials
- large conveyor drum pulleys
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
- The large 130 mm-bore 32026 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 130 mm shaft.
- The 320 narrow series at 130 mm bore keeps the OD down to 200 mm for space-limited hubs; its 45 mm width carries less load than a 30226, so do not substitute it into a 302 application without re-rating.
- Check the shoulder geometry for 32026: a generous fillet on the 130 mm shaft looks strong but stops the 45 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 35.0 mm-section cup presses flush in the 200 mm housing.
- Never fit 32026 by tightening the adjuster to force the cone up the 130 mm taper — draw the nut to seat the rollers, then back it off; the 45 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.
- Relubrication for 32026 must reach the rib-roller end contact, not just the 130 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 45 mm-wide assembly or the sliding rib contact starves first.
- 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 130 mm shaft or a tilted housing shoulder concentrates load on one end of the 45 mm-wide roller row — align seats and verify housing perpendicularity.
Frequently asked questions
What are the dimensions of a 32026 tapered roller bearing?
A 32026 single-row metric tapered roller bearing per ISO 355 has a 130 mm bore, 200 mm outer diameter and 45 mm total assembly width (5.118 × 7.874 × 1.772 in), a 35.0 mm radial section and roughly 4166 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32026 bore code work?
The last two digits of 32026 are bore code 26, giving 26 × 5 = 130 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 200 mm OD and 45 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32026?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32026 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 32026 set?
At fit-up the 130 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 130 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 32026 take axial load in both directions?
A single 32026 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.