24120 bearing: complete specifications & equivalents
The 24120 is a ISO 15 radial bearing sized 100 x 165 x 65 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 165 mm |
| Width B | 65 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 468 kN |
| Basic static load rating C0 | 640 kN |
| Fatigue load limit Pu | 68 kN |
| Reference speed (thermal) | 2400 rpm |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5650 g |
| Manufacturer designation | SKF 24120 CC/W33 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings); 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 & 24100-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 6.496 in |
| Width B | 2.559 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 32.5 mm |
| Smallest bore in 24100-series | 100 mm |
| Largest outer diameter in 24100-series | 790 mm |
| Width range across 24100-series | 65–308 mm |
| Bore position in 24100-series (smallest first) | 1 of 25 |
| Bore above smallest 24100-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24120 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
| C4120-2CS5V-GEM9 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 4120-2CS5V/GEM9 shares the 100×165×65 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
| C4120-V-VE240 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 4120 V/VE240 shares the 100×165×65 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
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 24120 model number is decoded
In SKF catalogue PUB BU/P1 17000, 24120 appears as 24120 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 100×165×65 mm to the ISO 15 boundary plan. Digit by digit, 24120 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 20 resolving to 100 mm; 165 mm OD and 65 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 68 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.37 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.
Typical equipment & failure modes
Common applications
- cement-mill trunnion and drive shafts
- heavy conveyor head shafts in mining
- jaw and cone crusher main shafts
- paper-machine press and dryer rolls
Known failure patterns
- raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating
- inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range
- cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration
- roller-end scoring from starved lubricant at start-up before the grease channel purges
- fretting corrosion on a loose rotating shaft seat or in vibratory stand-still
Selection pitfalls — read before you substitute
- Mount the 100 mm bore 24120 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.
- The 24100-series series at 100 mm bore (165×65 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 3,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.
- Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24120 pits long before its L10 life.
- Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The 468/640 kN ratings are SKF catalogue values for this exact execution (24120 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.
- SKF lists several executions of 24120 (cylindrical bore as listed, tapered-bore 24120 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24120 CC/W33 designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 24120?
The 24120 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 165 mm outer diameter and 65 mm width (3.937 × 6.496 × 2.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 468 kN, C0 640 kN, fatigue load limit Pu 68 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 5650 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring.
How does the 24120 bore code work?
The last two digits of 24120 are bore code 20, so 20 × 5 = 100 mm bore. The 165 mm OD and 65 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code.
What does the CC/W33 suffix mean on 24120?
CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper.
Can 24120 accommodate misalignment and axial load?
Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load.
When should the tapered-bore 24120K30 variant be used instead?
Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24120 listed here seats directly on a machined journal.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings on 2026-09-26. Read our editorial & correction policy.