32216T78-DB bearing: complete specifications & equivalents
The 32216T78-DB is a ISO 355 radial bearing sized 80 x 140 x 78 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 80 mm |
| Outer diameter D | 140 mm |
| Width B | 78 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 391 kN |
| Basic static load rating C0 | 490 kN |
| Fatigue load limit Pu | 57 kN |
| Reference speed (thermal) | 3000 rpm |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4400 g |
| Manufacturer designation | SKF 32216T78/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 | 3.15 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 3.071 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30 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) | 10 of 30 |
| Bore above smallest matched-db-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32216T78 | 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 32216T78-DB model number is decoded
32216T78-DB (SKF 32216T78/DB) is the back-to-back (O) matched pair matched-set choice for a 80 mm shaft: a pair of tapered roller bearings whose combined envelope is 140×78 mm, delivered ready to mount with controlled internal clearance.The code breaks down as base bearing 32216T78 plus matched-set suffix /DB: two bearings of the 80 mm bore size, paired back-to-back (O) matched pair, with the 78 mm overall width spanning the whole arrangement. Back-to-back matching puts the large rib ends outward — the stiffest arrangement for moment load, but one that converts shaft thermal growth into preload change; the factory setting of 32216T78-DB already accounts for the expected temperature gradient across the 78 mm pair width. Catalogue mass 4400 g covers both bearings and the ground spacer of 32216T78-DB; keep the set complete — substituting one bearing or a non-ground spacer destroys the factory clearance. Dimensional interchange map: within its boundary plan the 80×140×78 mm envelope of 32216T78-DB is fixed, so shoulder, spacer and seal drawings can be dimensioned straight from the catalogue table. Spacer discipline: the spacer between the two bearings of 32216T78-DB is ground to the individual set — it carries a serial link to the pair, so never swap spacers between sets of the same designation. Lubrication for the pair should be sized against the combined 78 mm width and 4400 g mass: two roller sets sweep twice the contact area of a single bearing of the same bore.
Typical equipment & failure modes
Common applications
- large process pump and compressor shafts
- rolling-mill auxiliary drives
- crane sheave and hoist gearboxes
- large process pump and compressor shafts
Known failure patterns
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- edge loading from shaft deflection or housing misalignment
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 32216T78-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Clamp the 32216T78-DB pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- A matched /DB set is ground as one system: never separate the two bearings of 32216T78-DB or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 391/490 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 32216T78/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 32216T78-DB?
The SKF 32216T78/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 80 mm bore, 140 mm outer diameter and 78 mm overall width (3.15 × 5.512 × 3.071 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 391 kN, C0 490 kN, fatigue load limit Pu 57 kN, reference speed 3,000 r/min, limiting speed 4,500 r/min, mass about 4.40 kg.
What does the /DB suffix on 32216T78-DB mean?
The base 32216T78 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 32216T78-DB for one bearing or the pair?
They are for the complete matched pair: C 391 kN dynamic and C0 490 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 32216T78 table values.
Can 32216T78-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 (k5 on a rotating 80 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 80 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.