32964-DF bearing: complete specifications & equivalents
The 32964-DF is a ISO 355 radial bearing sized 320 x 440 x 152 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 320 mm |
| Outer diameter D | 440 mm |
| Width B | 152 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1982 kN |
| Basic static load rating C0 | 4650 kN |
| Fatigue load limit Pu | 390 kN |
| Reference speed (thermal) | 750 rpm |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 69000 g |
| Manufacturer designation | SKF 32964/DF |
| 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-df-series range
| Bore d | 12.598 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 5.984 in |
| ISO bore code | 64 |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in matched-df-series | 25 mm |
| Largest outer diameter in matched-df-series | 540 mm |
| Width range across matched-df-series | 34.5–280 mm |
| Bore position in matched-df-series (smallest first) | 33 of 35 |
| Bore above smallest matched-df-series size | 295 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32964 | 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 32964-DF model number is decoded
Speed planning for the set uses the catalogue pair values: 750 r/min thermal reference and 1,200 r/min mechanical limiting speed — a matched pair runs warmer than one bearing because two roller sets share the 152 mm space. Operating context for the 320 mm bore: a shaft of this diameter typically runs in the xl-bore band of industrial duty, and the 440 mm OD places the housing shoulder near 448 mm outer abutment. Spacer discipline: the spacer between the two bearings of 32964-DF is ground to the individual set — it carries a serial link to the pair, so never swap spacers between sets of the same designation. Clamp the assembled pair axially through the cones — never through the rollers — and verify the 152 mm overall width against the catalogue value before final torquing of the shaft nut.For a 320 mm shaft carrying reversing axial load, SKF lists 32964-DF under catalogue execution SKF 32964/DF: a factory-matched face-to-face (X) matched pair tapered-roller pair, set and measured as one unit.Digit by digit, 32964-DF reads as the ISO 355 base bearing 32964 supplied as a face-to-face (X) matched pair matched pair (/DF); the 320 mm bore and 440 mm OD are per-bearing, the 152 mm width is for the set. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 32964-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 320 mm bore.
Typical equipment & failure modes
Common applications
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- wind-turbine main shafts
- rolling-mill roll-neck bearings
Known failure patterns
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- false brinelling on idle paired sets exposed to machine vibration
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- mounting score marks when the cone is cocked over the shaft keyway or a burr
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- A matched /DF set is ground as one system: never separate the two bearings of 32964-DF or swap the spacer — the factory clearance is lost the moment the set is broken.
- Setting is built into 32964-DF; the classic field error is re-adjusting a matched pair as if it were two loose single bearings, which destroys the /DF clearance class.
- A matched /DF set is ground as one system: never separate the two bearings of 32964-DF or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 1982/4650 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 32964/DF designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 32964-DF?
The SKF 32964/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 320 mm bore, 440 mm outer diameter and 152 mm overall width (12.598 × 17.323 × 5.984 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1982 kN, C0 4650 kN, fatigue load limit Pu 390 kN, reference speed 750 r/min, limiting speed 1,200 r/min, mass about 69.00 kg.
What does the /DF suffix on 32964-DF mean?
The base 32964 is the ISO 355 single-row bearing; the /DF suffix marks the matched-set execution — the arrangement (face-to-face (X)), 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 32964-DF for one bearing or the pair?
They are for the complete matched pair: C 1982 kN dynamic and C0 4650 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 32964 table values.
Can 32964-DF 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 320 mm shaft) and axial clamping through the cones; re-setting in the field destroys the matched clearance class.
When should a face-to-face (X) matched set be chosen?
Choose the face-to-face (X) set where the shaft grows thermally or alignment is imperfect — the converging load lines tolerate deflection. It is the default choice for wheel hubs and general gearbox shafts at the 320 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.