30324 bearing: complete specifications & equivalents
The 30324 is a ISO 355 radial bearing sized 120 x 260 x 59.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 120 mm |
| Outer diameter D | 260 mm |
| Width B | 59.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 601 kN |
| Basic static load rating C0 | 710 kN |
| Fatigue load limit Pu | 73.5 kN |
| Reference speed (thermal) | 2000 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 13500 g |
| Manufacturer designation | SKF 30324 |
| 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 & 30300-series range
| Bore d | 4.724 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 2.343 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in 30300-series | 15 mm |
| Largest outer diameter in 30300-series | 500 mm |
| Width range across 30300-series | 14.25–105 mm |
| Bore position in 30300-series (smallest first) | 22 of 32 |
| Bore above smallest 30300-series size | 105 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30324 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 355 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 30324 model number is decoded
SKF 30324 (SKF 30324) is the heavy-OD section tapered roller choice for a 120 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 260×59.5 mm ISO 355 envelope.Digit by digit, 30324 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 24 resolving to 120 mm; 260 mm OD and 59.5 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. At 2,000 r/min reference speed the 70.0 mm-section 30324 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. A single 30324 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
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- wind-turbine main 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
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- At 120 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
- The 303 series at 120 mm bore (260×59.5 mm) carries a larger OD and higher capacity than 30224 at the same bore; the bigger section runs hotter, so re-check the 2,600 r/min speed ceiling and shoulder diameters before substituting.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 30324 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 30324 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
- The 601/710 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 30324 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30324 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 30324?
The SKF 30324 is a single-row tapered roller bearing with 120 mm bore, 260 mm outer diameter and 59.5 mm width (4.724 × 10.236 × 2.343 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 601 kN, C0 710 kN, fatigue load limit Pu 73.5 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 13500 g. It is an open, separable bearing with a pressed-steel cage.
How does the 30324 bore code work?
The last two digits of 30324 are bore code 24, so 24 × 5 = 120 mm bore. The 260 mm OD and 59.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 30324 series and basic execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD 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 30324 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 30324 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 30324 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.