30210 bearing: complete specifications & equivalents
The 30210 is a ISO 355 radial bearing sized 50 x 90 x 21.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 50 mm |
| Outer diameter D | 90 mm |
| Width B | 21.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 93.1 kN |
| Basic static load rating C0 | 91.5 kN |
| Fatigue load limit Pu | 10.4 kN |
| Reference speed (thermal) | 6000 rpm |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 540 g |
| Manufacturer designation | SKF 30210 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 30200-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.856 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 30200-series | 15 mm |
| Largest outer diameter in 30200-series | 580 mm |
| Width range across 30200-series | 11.75–104 mm |
| Bore position in 30200-series (smallest first) | 10 of 37 |
| Bore above smallest 30200-series size | 35 mm |
Mounting, setting & life for 30210
Fits & mounting
- Tapered bearings are separable: press the cup square into the housing and fit the cone on the shaft — usually an interference fit on both seats in wheel/hub positions.
- Mount the cone by induction heating (max 120 °C); never strike the cage or rollers directly.
- Shaft and housing shoulders must clear the ring chamfers so the cone and cup seat fully against their faces.
Setting — the step deep-groove bearings never need
- After seating, set the assembly to a defined end play or preload with the locknut/shim arrangement; locknut torque seats the parts — it is not the final adjustment.
- General free-running positions: back the nut off while measuring with a dial indicator to a small end play (commonly around 0.05–0.15 mm for medium metric hubs — follow the OEM value).
- Pinions and stiff arrangements run a controlled preload; too much preload is the classic cause of early spalling and heat.
- Sealed factory-set units exist for specific designations — the open 30210 assumes the application sets and lubricates it.
Lubrication
Open TRBs are lubricated by the application. Fill the bearing with grease (typically around one third to one half of the free cavity — overpacking a TRB causes churning heat) and provide a relubrication path; intervals depend on contamination and temperature, not on catalogue rating alone.
Why the equivalent load matters more here
TRBs carry combined radial and axial loads, so the dynamic equivalent load P is computed with the bearing's e, X and Y factors for the actual thrust ratio — using the radial load alone over-estimates life badly.
Worked L10 life example (illustrative duty)
For roller bearings the life exponent is p = 10/3: L10h = (C/P)10/3 · 106 / (60·n). Taking an example equivalent load P = 18.6 kN (20% of C) at n = 1,500 r/min — substitute the real P from the X/Y calculation:
C = 93.1 kN → L10h ≈ 2,375 hours
Choosing a series at the same 50 mm bore
| Series | Open execution | OD × width T | C (kN) | C0 (kN) | Limiting speed (r/min) |
|---|---|---|---|---|---|
| 320xx | 32010 | 80 × 20 | 75.0 | 94.0 | 10,500 |
| 302xx | 30210 | 90 × 21.75 | 93.1 | 91.5 | 7,500 |
| 322xx | 32210 | 90 × 24.75 | 104.0 | 110.0 | 9,700 |
| 332xx | 33210 | 90 × 32 | 142.0 | 160.0 | 7,000 |
| 303xx | 30310D | 110 × 29.25 | 126.0 | 130.0 | 3,200 |
| 323xx | 32310C | 110 × 42.25 | 178.0 | 220.0 | 3,500 |
| 313xx | 31310 | 110 × 29.25 | 131.0 | 120.0 | 6,000 |
Different series at the same bore are not drop-in swaps — OD, width and contact angle all change — and a cone number alone never identifies a complete set. Verify matches per the cross-reference levels guide; envelope variants are on the 50×90×21.75 envelope page.
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30210 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
| 30210-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 30210 model number is decoded
SKF 30210 belongs to the SKF single-row tapered roller range — the 50 mm bore entry in the 30200 series, dimensioned 90 mm OD and 21.75 mm wide to the ISO 355 boundary plan.On the SKF nameplate, 30210 follows the ISO 355 convention: 3 for the tapered-roller type, 0 for the standard section, final digits 10 for the 50 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.98 (static 91.5 kN against dynamic 93.1 kN), typical of a tapered roller sized for axial capacity, and the 10.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 30210 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.
Typical equipment & failure modes
Common applications
- automotive and light-truck wheel hubs
- industrial gearbox shafts and reducers
- differential and pinion drives
- pump and compressor shafts
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- false brinelling on idle paired sets exposed to machine vibration
- roller large-end smearing against the cone rib after EP lubricant film failure
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30210 pair heats, loses setting control and smears the roller-rib contact.
- The 302 series at 50 mm bore (90×21.75 mm) is the standard tapered-roller envelope; stepping to a 32210 or 32310 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.
- At the 93.1 kN rating of 30210, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 7,500 r/min speed end and heavier preload only where moment stiffness dominates.
- O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30210 mounting error.
- Catalogue reference speed and limiting speed are different limits: the 6,000 r/min reference is a thermal criterion under load, while the 7,500 r/min limiting value is the mechanical ceiling — observe both.
- The 93.1/91.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 30210 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30210 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 30210?
The SKF 30210 is a single-row tapered roller bearing with 50 mm bore, 90 mm outer diameter and 21.75 mm width (1.969 × 3.543 × 0.856 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 93.1 kN, C0 91.5 kN, fatigue load limit Pu 10.4 kN, reference speed 6,000 r/min, limiting speed 7,500 r/min, mass about 540 g. It is an open, separable bearing with a pressed-steel cage.
How does the 30210 bore code work?
The last two digits of 30210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 21.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 30210 series and basic execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution.
Can a single 30210 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does 30210 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30210 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB on 2026-09-26. Read our editorial & correction policy.