32244T248-DB bearing: complete specifications & equivalents
The 32244T248-DB is a ISO 355 radial bearing sized 220 x 400 x 248 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 220 mm |
| Outer diameter D | 400 mm |
| Width B | 248 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 2949 kN |
| Basic static load rating C0 | 5400 kN |
| Fatigue load limit Pu | 465 kN |
| Reference speed (thermal) | 900 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 126000 g |
| Manufacturer designation | SKF 32244T248/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 | 8.661 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 9.764 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 90 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) | 26 of 30 |
| Bore above smallest matched-db-series size | 185 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32244T248 | 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 32244T248-DB model number is decoded
32244T248-DB (SKF 32244T248/DB) is the back-to-back (O) matched pair matched-set choice for a 220 mm shaft: a pair of tapered roller bearings whose combined envelope is 400×248 mm, delivered ready to mount with controlled internal clearance.On the SKF nameplate, 32244T248-DB reads as base 32244T248 in a /DB matched execution — the suffix is part of the order number because a matched set is ground for a specific axial clearance and cannot be assembled from loose single bearings. In the back-to-back (O) arrangement the load lines diverge toward the shaft axis, giving the pair a wide effective spread: 32244T248-DB resists overturning moments and tilting loads stiffly, which is why O-sets are preferred for gearbox output shafts and pinion supports. Selection arithmetic: the catalogue C 2949 kN and C0 5400 kN are ratings of the complete pair, not of one bearing — never halve them back to a single-row figure when checking L10 life, and use the pair Pu 465 kN as the fatigue floor. Cross-section geometry: the 90.0 mm half-section ((400−220)/2) places the roller pitch diameter near 310 mm, and the 248 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of 32244T248-DB. Mounting order matters for 32244T248-DB: seat the first bearing, fit the ground spacer, then the second bearing, and clamp axially as a unit — the 248 mm catalogue width is the assembled result and the gauge for correct assembly. The rotating cones of 32244T248-DB take a m6 seat on the 220 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- rolling-mill roll-neck bearings
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- edge loading from shaft deflection or housing misalignment
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- Clamp the 32244T248-DB pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Setting is built into 32244T248-DB; the classic field error is re-adjusting a matched pair as if it were two loose single bearings, which destroys the /DB clearance class.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 32244T248-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- The 2949/5400 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 32244T248/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 32244T248-DB?
The SKF 32244T248/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 220 mm bore, 400 mm outer diameter and 248 mm overall width (8.661 × 15.748 × 9.764 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2949 kN, C0 5400 kN, fatigue load limit Pu 465 kN, reference speed 900 r/min, limiting speed 1,500 r/min, mass about 126.00 kg.
What does the /DB suffix on 32244T248-DB mean?
The base 32244T248 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 32244T248-DB for one bearing or the pair?
They are for the complete matched pair: C 2949 kN dynamic and C0 5400 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 32244T248 table values.
Can 32244T248-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 220 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 220 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.