32217T87-DB bearing: complete specifications & equivalents
The 32217T87-DB is a ISO 355 radial bearing sized 85 x 150 x 87 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 85 mm |
| Outer diameter D | 150 mm |
| Width B | 87 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 451 kN |
| Basic static load rating C0 | 570 kN |
| Fatigue load limit Pu | 65.5 kN |
| Reference speed (thermal) | 2800 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5650 g |
| Manufacturer designation | SKF 32217T87/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 | 3.346 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 3.425 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 32.5 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) | 11 of 30 |
| Bore above smallest matched-db-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32217T87 | 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 32217T87-DB model number is decoded
Dividing the pair C 451 kN by the 85 mm bore gives 5.31 kN per millimetre of journal for the complete arrangement — a density metric that compares matched sets across the back-to-back (O) matched pair family. Material and manufacturing detail: the 5650 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. Inspection shorthand: at overhaul, mark both bearings and the spacer of 32217T87-DB before disassembly — the set is a matched system, and re-assembling with one component reversed changes the factory setting. Clamp the assembled pair axially through the cones — never through the rollers — and verify the 87 mm overall width against the catalogue value before final torquing of the shaft nut.SKF 32217T87/DB belongs to the SKF matched tapered-roller range — the 85 mm bore entry in back-to-back (O) matched pair arrangement, dimensioned 150 mm OD and 87 mm overall width for the pair.On the SKF nameplate, 32217T87-DB reads as base 32217T87 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. 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 32217T87-DB already accounts for the expected temperature gradient across the 87 mm pair width.
Typical equipment & failure modes
Common applications
- marine deck machinery shafts
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
- construction machinery drives
Known failure patterns
- false brinelling on idle paired sets exposed to machine vibration
- false brinelling on idle paired sets exposed to machine vibration
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- grease degradation after long shelf storage without rotation or re-greasing
- 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 32217T87-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 32217T87-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- O and X arrangements are not interchangeable by turning the set around: 32217T87-DB in back-to-back (O) matched pair arrangement has its load-line geometry fixed — specify the arrangement from the shaft thermal and stiffness analysis.
- The 451/570 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 32217T87/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 32217T87-DB?
The SKF 32217T87/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 85 mm bore, 150 mm outer diameter and 87 mm overall width (3.346 × 5.906 × 3.425 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 451 kN, C0 570 kN, fatigue load limit Pu 65.5 kN, reference speed 2,800 r/min, limiting speed 4,300 r/min, mass about 5.65 kg.
What does the /DB suffix on 32217T87-DB mean?
The base 32217T87 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 32217T87-DB for one bearing or the pair?
They are for the complete matched pair: C 451 kN dynamic and C0 570 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 32217T87 table values.
Can 32217T87-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 85 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 85 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.