C6909-V bearing: complete specifications & equivalents
The C6909-V is a ISO 15 radial bearing sized 45 x 68 x 40 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 68 mm |
| Width B | 40 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 132 kN |
| Basic static load rating C0 | 200 kN |
| Fatigue load limit Pu | 23.6 kN |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 530 g |
| Manufacturer designation | C 6909 V |
| 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 & C6900-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 2.677 in |
| Width B | 1.575 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 11.5 mm |
| Smallest bore in C6900-series | 45 mm |
| Largest outer diameter in C6900-series | 105 mm |
| Width range across C6900-series | 40–54 mm |
| Bore position in C6900-series (smallest first) | 1 of 5 |
| Bore above smallest C6900-series size | 0 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the C6909-V model number is decoded
C 6909 V is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 45×68×40 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 6909 V separates into C (CARB), 69 (dimension series), 09 (45 mm bore) and V (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)); envelope 45×68×40 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 45 mm shaft deflects; no reference speed is listed and the limiting speed is 2,600 r/min. The 530 g mass over the 45×68×40 mm envelope yields about 2.93 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 68 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.
Typical equipment & failure modes
Common applications
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- continuous-caster guide rolls and slab-caster segments under heat growth
- vibrating screen exciters fitted with the VE240 tolerance execution
- long fan and kiln main shafts where the free end must float without thrust load
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after sustained overload
- thermal preloading when a shaft is located at both ends and growth has nowhere to go
- brass cage pocket wear under marginal lubrication in the large-bore M/MB executions
- false brinelling and rust-red witness marks on standby machines under external vibration
- abrasive paste forming as dust bypasses the housing seals into the open washer set
Selection pitfalls — read before you substitute
- At 45 mm bore the small CARB executions are unusually wide (40 mm) for their 68 mm OD — confirm the housing width before substituting a standard spherical bearing of the same bore.
- Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.
- The quoted 132/200 kN ratings belong to this exact execution (C 6909 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 45 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- Never use C 6909 V 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.
- The 132/200 kN ratings and 530 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 858); 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
How is C 6909 V mounted?
Slide or heat (max 120 °C) the bearing onto the 45 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 40 mm roller set.
What are the dimensions and ratings of the C 6909 V?
A C 6909 V measures 45 mm bore × 68 mm outside diameter × 40 mm width (1.772 × 2.677 × 1.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 132 kN, static C0 200 kN, fatigue limit Pu 23.6 kN, limiting speed 2,600 r/min, no reference speed listed, mass about 530 g.
Can a CARB bearing like C 6909 V locate the shaft axially?
No — that is the defining feature. C 6909 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust.
How is the C 6909 V designation read?
C = CARB toroidal family; 69 = dimension series; 09 = 45 mm bore (code 09 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve.
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.