30217 bearing: complete specifications & equivalents
The 30217 is a ISO 355 radial bearing sized 85 x 150 x 30.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 85 mm |
| Outer diameter D | 150 mm |
| Width B | 30.5 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) | 1867 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 30217 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 30200-series range
| Bore d | 3.346 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 1.201 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 32.5 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) | 14 of 19 |
| Bore above smallest 30200-series size | 65 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30217 | 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 30217 model number is decoded
In the 30200-series the last two digits of 30217 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 355 envelope is 150 mm outside diameter and 30.5 mm total assembly width T over the separable cone and cup — 3.346 × 5.906 × 1.201 in, with a 32.5 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 85 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
- agricultural tractor axles
- truck and trailer wheel hubs
- heavy final drives and differentials
- large conveyor drum pulleys
- crane travel wheels and winch drums
Known failure patterns
- raceway spalling at the roller-rib junction after the L10 life or sustained axial overload
- 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
Selection pitfalls — read before you substitute
- The large 85 mm-bore 30217 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 85 mm shaft.
- The 302 light series at 85 mm bore (150×30.5 mm, 32.5 mm section) is the default general-purpose tapered row; a 32217 on the same 85 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 30217: a generous fillet on the 85 mm shaft looks strong but stops the 30.5 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section cup presses flush in the 150 mm housing.
- Never fit 30217 by tightening the adjuster to force the cone up the 85 mm taper — draw the nut to seat the rollers, then back it off; the 30.5 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.
- Keep the 30217 pair matched through rebuilds; the 30.5 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 85 mm shaft alignment.
- The cone and the cup of 30217 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 85 mm-bore 30217 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 30217 tapered roller bearing?
A 30217 single-row metric tapered roller bearing per ISO 355 has a 85 mm bore, 150 mm outer diameter and 30.5 mm total assembly width (3.346 × 5.906 × 1.201 in), a 32.5 mm radial section and roughly 1867 g geometry-based estimated mass; catalogue masses vary with roller and cage design.
How does the 30217 bore code work?
The last two digits of 30217 are bore code 17, giving 17 × 5 = 85 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 150 mm OD and 30.5 mm width come from the ISO 355 diameter and width series, not the bore code alone.
What is the cone and cup of 30217?
Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30217 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 30217 set?
At fit-up the 85 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 85 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 30217 take axial load in both directions?
A single 30217 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.