C39-1500-MB bearing: complete specifications & equivalents
The C39-1500-MB is a ISO 15 radial bearing sized 1500 x 1950 x 335 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 1500 mm |
| Outer diameter D | 1950 mm |
| Width B | 335 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 19600 kN |
| Basic static load rating C0 | 48000 kN |
| Fatigue load limit Pu | 2400 kN |
| Reference speed (thermal) | 140 rpm |
| Limiting speed (mechanical) | 200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2710000 g |
| Manufacturer designation | C 39/1500 MB |
| 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 | 59.055 in |
|---|---|
| Outer diameter D | 76.772 in |
| Width B | 13.189 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 225 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) | 14 of 15 |
| Bore above smallest C3900-series size | 1140 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the C39-1500-MB model number is decoded
C 39/1500 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 1500×1950×335 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 39/1500 MB the 39 dimension series fixes the 1950 mm OD and 335 mm width around the 1500 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 1500 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1500×1950×335 mm are identical — only the mounting method changes. 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 39/1500 MB deliberately carries none. Mounting: slide the bearing onto the 1500 mm seat or heat it (max 120 °C) and seat it square; never press through the 335 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.
Typical equipment & failure modes
Common applications
- 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
- continuous-caster guide rolls and slab-caster segments under heat growth
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
- 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
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
Selection pitfalls — read before you substitute
- At 1500 mm bore the 2710 kg mass and 335 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.
- Reference and limiting speeds are different limits: the 140 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.
- The quoted 19600/48000 kN ratings belong to this exact execution (C 39/1500 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1500 MB must float; the two are designed to be used as a pair.
- Never use C 39/1500 MB 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 19600/48000 kN ratings and 2710000 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
How is C 39/1500 MB mounted?
Slide or heat (max 120 °C) the bearing onto the 1500 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 335 mm roller set.
What are the dimensions and ratings of the C 39/1500 MB?
A C 39/1500 MB measures 1500 mm bore × 1950 mm outside diameter × 335 mm width (59.055 × 76.772 × 13.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 19600 kN, static C0 48000 kN, fatigue limit Pu 2400 kN, reference speed 140 r/min, limiting speed 200 r/min, mass about 2710000 g.
Can a CARB bearing like C 39/1500 MB locate the shaft axially?
No — that is the defining feature. C 39/1500 MB 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 39/1500 MB designation read?
C = CARB toroidal family; 39 = dimension series; 1500 mm (slash-size) = 1500 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). 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.