33212-DF bearing: complete specifications & equivalents
The 33212-DF is a ISO 355 radial bearing sized 60 x 110 x 76 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 60 mm |
| Outer diameter D | 110 mm |
| Width B | 76 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 354 kN |
| Basic static load rating C0 | 475 kN |
| Fatigue load limit Pu | 53 kN |
| Reference speed (thermal) | 3800 rpm |
| Limiting speed (mechanical) | 6000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3150 g |
| Manufacturer designation | SKF 33212/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 | 2.362 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 2.992 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 25 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) | 8 of 35 |
| Bore above smallest matched-df-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33212 | 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 33212-DF model number is decoded
Ordering number SKF 33212/DF in SKF catalogue PUB BU/P1 17000 denotes two single-row tapered roller bearings supplied as a matched face-to-face (X) matched pair set for a 60 mm shaft — one order number, one factory setting.The code breaks down as base bearing 33212 plus matched-set suffix /DF: two bearings of the 60 mm bore size, paired face-to-face (X) matched pair, with the 76 mm overall width spanning the whole arrangement. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 33212-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 60 mm bore. Selection arithmetic: the catalogue C 354 kN and C0 475 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 53 kN as the fatigue floor. Load system: C 354 kN against C0 475 kN gives a 1.34 balance, and 5.90 kN of dynamic capacity per millimetre of the 60 mm bore is the density figure to compare against neighbouring sizes. Inspection shorthand: at overhaul, mark both bearings and the spacer of 33212-DF 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 76 mm overall width against the catalogue value before final torquing of the shaft nut.
Typical equipment & failure modes
Common applications
- rolling-mill auxiliary drives
- crane sheave and hoist gearboxes
- paper-machine and printing rolls
- rolling-mill auxiliary drives
Known failure patterns
- false brinelling on idle paired sets exposed to machine vibration
- 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
- rib-roller contact scoring from loss of the EP additive film
- rib-roller contact scoring from loss of the EP additive film
Selection pitfalls — read before you substitute
- Clamp the 33212-DF 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 33212-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Replace 33212-DF as a complete set: pairing a new bearing with a worn partner leaves the clearance undefined even when the designation matches.
- The 354/475 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 33212/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 33212-DF?
The SKF 33212/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 60 mm bore, 110 mm outer diameter and 76 mm overall width (2.362 × 4.331 × 2.992 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 354 kN, C0 475 kN, fatigue load limit Pu 53 kN, reference speed 3,800 r/min, limiting speed 6,000 r/min, mass about 3.15 kg.
What does the /DF suffix on 33212-DF mean?
The base 33212 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 33212-DF for one bearing or the pair?
They are for the complete matched pair: C 354 kN dynamic and C0 475 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 33212 table values.
Can 33212-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 (k5 on a rotating 60 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 60 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.