32240T228-DB bearing: complete specifications & equivalents
The 32240T228-DB is a ISO 355 radial bearing sized 200 x 360 x 288 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 200 mm |
| Outer diameter D | 360 mm |
| Width B | 288 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 2229 kN |
| Basic static load rating C0 | 4000 kN |
| Fatigue load limit Pu | 360 kN |
| Reference speed (thermal) | 1000 rpm |
| Limiting speed (mechanical) | 1700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 105000 g |
| Manufacturer designation | SKF 32240T228/DB |
| Standard | ISO 355 |
| 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 & matched-db-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 11.339 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 80 mm |
| Smallest bore in matched-db-series | 35 mm |
| Largest outer diameter in matched-db-series | 480 mm |
| Width range across matched-db-series | 41.5–288 mm |
| Bore position in matched-db-series (smallest first) | 25 of 30 |
| Bore above smallest matched-db-series size | 165 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32240T228 | 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 32240T228-DB model number is decoded
With a pair mass of 105000 g across the 200×360×288 mm envelope, the set replaces what would otherwise be two separate bearings plus spacer grinding work — the factory setting is the engineering value being purchased. Load system: C 2229 kN against C0 4000 kN gives a 1.79 balance, and 11.14 kN of dynamic capacity per millimetre of the 200 mm bore is the density figure to compare against neighbouring sizes. Thermal behaviour of the pair: heat generated in the 200 mm bore cones flows along the shaft and changes the setting; the /DB clearance class is chosen for the catalogue speed range 1,000–1,700 r/min, so re-select the clearance class if the application runs hotter. The rotating cones of 32240T228-DB take a m6 seat on the 200 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.32240T228-DB is a matched pair of single-row tapered roller bearings arranged back-to-back (O) matched pair, supplied by SKF in SKF catalogue PUB BU/P1 17000 as one factory-set unit: the two bearings, spacers and setting are matched together and must not be mixed with other sets.Reading the designation: 32240T228 is the ISO 355 single-row base bearing (200 mm bore), and the suffix /DB marks the matched-set execution — arrangement, spacer grinding and factory clearance class. The pair envelope is 200×360×288 mm; the width covers both bearings of the set. In the back-to-back (O) arrangement the load lines diverge toward the shaft axis, giving the pair a wide effective spread: 32240T228-DB resists overturning moments and tilting loads stiffly, which is why O-sets are preferred for gearbox output shafts and pinion supports.
Typical equipment & failure modes
Common applications
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large industrial mixer shafts
Known failure patterns
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- fretting corrosion on a loose rotating shaft seat
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- Clamp the 32240T228-DB pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 32240T228-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- A matched /DB set is ground as one system: never separate the two bearings of 32240T228-DB or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 2229/4000 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 32240T228/DB designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 32240T228-DB?
The SKF 32240T228/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 200 mm bore, 360 mm outer diameter and 288 mm overall width (7.874 × 14.173 × 11.339 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2229 kN, C0 4000 kN, fatigue load limit Pu 360 kN, reference speed 1,000 r/min, limiting speed 1,700 r/min, mass about 105.00 kg.
What does the /DB suffix on 32240T228-DB mean?
The base 32240T228 is the ISO 355 single-row bearing; the /DB suffix marks the matched-set execution — the arrangement (back-to-back (O)), the ground spacer and the factory-set axial clearance class. A matched set cannot be assembled from loose single bearings; quote the full designation when ordering.
Are the C and C0 ratings of 32240T228-DB for one bearing or the pair?
They are for the complete matched pair: C 2229 kN dynamic and C0 4000 kN static already include load sharing between the two bearings. Do not halve them for single-bearing checks, and do not compare them directly with the single-row 32240T228 table values.
Can 32240T228-DB be adjusted like two loose tapered bearings?
No — the axial clearance is set at the factory by selective spacer grinding. Mounting work is limited to clean seats, correct fits (m6 on a rotating 200 mm shaft) and axial clamping through the cones; re-setting in the field destroys the matched clearance class.
When should a back-to-back (O) matched set be chosen?
Choose the back-to-back (O) set where moment stiffness dominates — pinion supports, gearbox output shafts, crane sheaves. The diverging load lines give the widest effective spread at the 200 mm bore.
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.