C39-800-M bearing: complete specifications & equivalents
The C39-800-M is a ISO 15 radial bearing sized 800 x 1060 x 195 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 800 mm |
| Outer diameter D | 1060 mm |
| Width B | 195 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 6400 kN |
| Basic static load rating C0 | 14600 kN |
| Fatigue load limit Pu | 880 kN |
| Reference speed (thermal) | 380 rpm |
| Limiting speed (mechanical) | 530 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 480000 g |
| Manufacturer designation | C 39/800 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 & C3900-series range
| Bore d | 31.496 in |
|---|---|
| Outer diameter D | 41.732 in |
| Width B | 7.677 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 130 mm |
| Smallest bore in C3900-series | 360 mm |
| Largest outer diameter in C3900-series | 2180 mm |
| Width range across C3900-series | 90–355 mm |
| Bore position in C3900-series (smallest first) | 10 of 15 |
| Bore above smallest C3900-series size | 440 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the C39-800-M model number is decoded
C 39/800 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 800×1060×195 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 39/800 M separates into C (CARB), 39 (dimension series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 800×1060×195 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 800 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/800 M deliberately carries none. Mounting: slide the bearing onto the 800 mm seat or heat it (max 120 °C) and seat it square; never press through the 195 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.
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
- roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- abrasive paste forming as dust bypasses the housing seals into the open washer set
Selection pitfalls — read before you substitute
- At 800 mm bore the 480 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.
- 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.
- Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/800 M must float; the two are designed to be used as a pair.
- Never use C 39/800 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 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- The 6400/14600 kN ratings and 480000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); 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
What is the difference between V and TN9 CARB executions?
V is the full-complement execution with no cage — more rollers, higher C (6400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/800 M is the cylindrical bore for direct shaft fitting, machined brass M cage.
How is C 39/800 M mounted?
Slide or heat (max 120 °C) the bearing onto the 800 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 195 mm roller set.
What are the dimensions and ratings of the C 39/800 M?
A C 39/800 M measures 800 mm bore × 1060 mm outside diameter × 195 mm width (31.496 × 41.732 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6400 kN, static C0 14600 kN, fatigue limit Pu 880 kN, reference speed 380 r/min, limiting speed 530 r/min, mass about 480000 g.
Can a CARB bearing like C 39/800 M locate the shaft axially?
No — that is the defining feature. C 39/800 M 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.
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.