32220 bearing: complete specifications & equivalents
The 32220 is a ISO 355 radial bearing sized 100 x 180 x 49 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 100 mm |
| Outer diameter D | 180 mm |
| Width B | 49 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) | 4399 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 32220 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 32200-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.929 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 32200-series | 20 mm |
| Largest outer diameter in 32200-series | 200 mm |
| Width range across 32200-series | 19–56 mm |
| Bore position in 32200-series (smallest first) | 17 of 19 |
| Bore above smallest 32200-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32220 | 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 32220 model number is decoded
In the 32200-series the last two digits of 32220 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 355 envelope is 180 mm outside diameter and 49 mm total assembly width T over the separable cone and cup — 3.937 × 7.087 × 1.929 in, with a 40.0 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 100 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
- 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
- The large 100 mm-bore 32220 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 100 mm shaft.
- The 322 medium series at 100 mm bore (180×49 mm) gains roller length and load over the 30220 on the same OD; the wider 49 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.
- Check the shoulder geometry for 32220: a generous fillet on the 100 mm shaft looks strong but stops the 49 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section cup presses flush in the 180 mm housing.
- Never fit 32220 by tightening the adjuster to force the cone up the 100 mm taper — draw the nut to seat the rollers, then back it off; the 49 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.
- Inspect the removed 32220 cone and cup as a pair: pitting on the 180 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 100 mm cone points to wrong preload or lost EP film — the two faults need different corrections.
- Do not swap a 32200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.
- 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.
Frequently asked questions
What are the dimensions of a 32220 tapered roller bearing?
A 32220 single-row metric tapered roller bearing per ISO 355 has a 100 mm bore, 180 mm outer diameter and 49 mm total assembly width (3.937 × 7.087 × 1.929 in), a 40.0 mm radial section and roughly 4399 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 32220 bore code work?
The last two digits of 32220 are bore code 20, giving 20 × 5 = 100 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 180 mm OD and 49 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 32220?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32220 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 32220 set?
At fit-up the 100 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 100 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 32220 take axial load in both directions?
A single 32220 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.