331775B bearing: complete specifications & equivalents
The 331775B is a ANSI ABMA 19.2 radial bearing sized 333.375 x 469.9 x 190.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 333.375 mm |
| Outer diameter D | 469.9 mm |
| Width B | 190.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 2642 kN |
| Basic static load rating C0 | 5700 kN |
| Fatigue load limit Pu | 465 kN |
| Operating temperature | -40 to +120 °C |
| Mass | 98000 g |
| Manufacturer designation | SKF 331775 B |
| Standard | ANSI ABMA 19.2 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants); 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 & tdo-series range
| Bore d | 13.125 in |
|---|---|
| Outer diameter D | 18.5 in |
| Width B | 7.5 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 68.3 mm |
| Smallest bore in tdo-series | 101.6 mm |
| Largest outer diameter in tdo-series | 596.9 mm |
| Width range across tdo-series | 49.212–284 mm |
| Bore position in tdo-series (smallest first) | 10 of 23 |
| Bore above smallest tdo-series size | 231.775 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 331775B | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 331775B model number is decoded
Wear pattern reading at overhaul: the two rows of 331775B should show symmetric raceway contact; one-sided wear points to housing misalignment or a cocked seat rather than to a material defect. The catalogue publishes no speed ratings for this size class — permissible speed is set by the application thermal balance; plan lubrication and cooling against the 98.0 kg mass and the 469.9 mm OD surface. Material and manufacturing detail: the 98000 g catalogue mass reflects through-hardened bearing steel machined to the listed envelope; ring roundness and width tolerance keep the mounted-setting scatter inside the catalogue class. Service-parts note: a worn 331775B must be replaced by the same TDO/XDC variant or by a works-approved successor — the variant encodes the spacer grinding that sets the operating clearance of the two rows. TDO mounting: the double cup is clamped in the housing and the two cones take interference on the 333.375 mm shaft; press force goes through the cone faces only — driving through the rollers brinells both raceways at once.331775B is a double-row tapered roller bearing of the TDO design, listed by SKF in SKF catalogue PUB BU/P1 17000: one double cup and two cones in a fixed X arrangement with the axial clearance set at the factory — a ready-to-mount unit for heavy combined load.Digit by digit, 331775B breaks into the base number 331775 — the 333.375×469.9×190.5 mm boundary — and the TDO/XDC variant code, which is part of the order designation and must be quoted in full at purchase.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- marine propulsion gearboxes
Known failure patterns
- unequal load sharing between the two roller rows when the centre spacer loses its factory grinding
- axial clamping ring bolt relaxation that lets the clearance-set rows walk apart under reversing thrust
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- electrical pitting on VFD-driven shafts without grounding protection
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- Lifting 331775B by one ring separates the assembly; sling through the 333.375 mm bore or use the shaft as the lifting member.
- The 333.375 mm bore seat must be checked for ovality before mounting — at this size a worn seat lets the cone creep, and fretting debris then works between the rows of 331775B.
- Never adjust the clearance of 331775B in the field: the two rows are set by ground spacers at the factory, and shim experiments on a 98.0 kg assembly usually end in overheated rows.
- The 2642/5700 kN ratings are SKF catalogue 17000 values for this execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.
- Quote the full SKF 331775 B designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 331775B?
The SKF 331775 B is a double-row tapered roller bearing of TDO design with 333.375 mm bore, 469.9 mm outer diameter and 190.5 mm overall width (13.125 × 18.5 × 7.5 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2642 kN, C0 5700 kN, fatigue load limit Pu 465 kN, mass about 98.00 kg.
What does the TDO/XDC variant code on 331775B mean?
Double-row tapered bearings of this size follow SKF works numbering: the base number 331775 fixes the 333.375×469.9×190.5 mm envelope, and the TDO/XDC code identifies the internal design variant — spacer execution, rib detail and clearance class. Same-envelope units under a different variant are not interchangeable without checking the variant meaning.
Why does the catalogue list no speed rating for 331775B?
Bearings of this size class run in slow, heavily loaded machinery where the permissible speed is set by the application heat balance rather than a universal table value. Plan lubrication and cooling against the 98.0 kg assembly mass and instrument the first run with temperature logging.
Can components of 331775B be interchanged with another unit of the same base number?
No — cones, cups and spacers of a double-row set are matched per serial and the clearance is set by selective grinding at the factory. Replace 331775B as a complete assembly in the same TDO/XDC variant.
How does 331775B react axial load?
The TDO design works as a fixed X arrangement: one double cup with two cones locates the shaft in both axial directions, with load shared between the two rows according to the factory-set clearance.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants on 2026-09-29. Read our editorial & correction policy.