30220 bearing: complete specifications & equivalents
The 30220 is a ISO 355 radial bearing sized 100 x 180 x 37 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 | 37 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) | 3321 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 30220 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 30200-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.457 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 30200-series | 20 mm |
| Largest outer diameter in 30200-series | 200 mm |
| Width range across 30200-series | 15.25–41 mm |
| Bore position in 30200-series (smallest first) | 17 of 19 |
| Bore above smallest 30200-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30220 | 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 30220 model number is decoded
In the 30200-series the last two digits of 30220 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 355 envelope is 180 mm outside diameter and 37 mm total assembly width T over the separable cone and cup — 3.937 × 7.087 × 1.457 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
- large conveyor drum pulleys
- crane travel wheels and winch drums
- railway axle boxes
- agricultural tractor axles
- truck and trailer wheel hubs
Known failure patterns
- 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
- roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film
Selection pitfalls — read before you substitute
- The large 100 mm-bore 30220 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 302 light series at 100 mm bore (180×37 mm, 40.0 mm section) is the default general-purpose tapered row; a 32220 on the same 100 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.
- Check the shoulder geometry for 30220: a generous fillet on the 100 mm shaft looks strong but stops the 37 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 30220 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 37 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.
- Keep the 30220 pair matched through rebuilds; the 37 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 100 mm shaft alignment.
- Tapered rollers accept virtually no misalignment; a deflected 100 mm shaft or a tilted housing shoulder concentrates load on one end of the 37 mm-wide roller row — align seats and verify housing perpendicularity.
- Press the 30220 cone onto the 100 mm shaft with force on the inner ring and the cup into the 180 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.
Frequently asked questions
What are the dimensions of a 30220 tapered roller bearing?
A 30220 single-row metric tapered roller bearing per ISO 355 has a 100 mm bore, 180 mm outer diameter and 37 mm total assembly width (3.937 × 7.087 × 1.457 in), a 40.0 mm radial section and roughly 3321 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 30220 bore code work?
The last two digits of 30220 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 37 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 30220?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30220 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 30220 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 30220 take axial load in both directions?
A single 30220 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.