C3034-M bearing: complete specifications & equivalents
The C3034-M is a ISO 15 radial bearing sized 170 x 260 x 67 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 170 mm |
| Outer diameter D | 260 mm |
| Width B | 67 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 750 kN |
| Basic static load rating C0 | 1080 kN |
| Fatigue load limit Pu | 100 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 2800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12500 g |
| Manufacturer designation | C 3034 M |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal 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 & C3000-series range
| Bore d | 6.693 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 2.638 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in C3000-series | 120 mm |
| Largest outer diameter in C3000-series | 1420 mm |
| Width range across C3000-series | 46–308 mm |
| Bore position in C3000-series (smallest first) | 3 of 33 |
| Bore above smallest C3000-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23034 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (170×260×67 mm) SKF spherical roller bearing SKF 23034 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23034 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
| 23034-CCK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (170×260×67 mm) SKF spherical roller bearing SKF 23034 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23034 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
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 C3034-M model number is decoded
The CARB bearing C 3034 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 170 mm bore, 260 mm outside diameter, 67 mm wide unit rated 750 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (34) encode the 170 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 170 mm and larger sizes needing robust guidance under heavy load. Selection arithmetic: C 750 kN against C0 1080 kN gives a C0/C ratio of 1.44, and the 100 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 170 mm seat or heat it (max 120 °C) and seat it square; never press through the 67 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.
Typical equipment & failure modes
Common applications
- long fan and kiln main shafts where the free end must float without thrust load
- heavy industrial gearbox layshafts used as the non-locating position
- winder and reel drums in paper and steel strip plants
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
Known failure patterns
- roller-end and flange smearing after lubricant starvation at the long roller contacts
- edge loading and premature spalling when the CARB position is blocked from its designed axial float
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
Selection pitfalls — read before you substitute
- At 170 mm bore, shaft expansion is already measurable: calculate the required float inside the 67 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- The quoted 750/1080 kN ratings belong to this exact execution (C 3034 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.
- Never use C 3034 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.
- Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 170 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- The 750/1080 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
Why is C 3034 M used opposite a spherical roller bearing?
The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls.
Is the C 3034 M sealed?
No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size.
What fails first on a misapplied CARB bearing?
Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running.
Which dimensions does the C 3034 M have?
A C 3034 M measures 170 mm bore × 260 mm outside diameter × 67 mm width (6.693 × 10.236 × 2.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 750 kN, static C0 1080 kN, fatigue limit Pu 100 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 12500 g.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings on 2026-09-27. Read our editorial & correction policy.