30212-DF bearing: complete specifications & equivalents
The 30212-DF is a ISO 355 radial bearing sized 60 x 110 x 47.5 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 | 47.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 207 kN |
| Basic static load rating C0 | 228 kN |
| Fatigue load limit Pu | 26.5 kN |
| Reference speed (thermal) | 4000 rpm |
| Limiting speed (mechanical) | 6000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1800 g |
| Manufacturer designation | SKF 30212/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 | 1.87 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 |
|---|---|---|---|
| 30212 | 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. |
| 30212-NTN | NTN | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 30212-DF model number is decoded
In the face-to-face (X) arrangement the load lines of the two bearings converge toward the shaft axis: the set tolerates shaft deflection and thermal growth better than a back-to-back pair, but is less stiff against overturning moments. The 47.5 mm overall width of 30212-DF is the axial space the pair occupies. Selection arithmetic: the catalogue C 207 kN and C0 228 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 26.5 kN as the fatigue floor. Load system: C 207 kN against C0 228 kN gives a 1.10 balance, and 3.45 kN of dynamic capacity per millimetre of the 60 mm bore is the density figure to compare against neighbouring sizes. Mounting order matters for 30212-DF: seat the first bearing, fit the ground spacer, then the second bearing, and clamp axially as a unit — the 47.5 mm catalogue width is the assembled result and the gauge for correct assembly. The rotating cones of 30212-DF take a k5 seat on the 60 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.30212-DF (SKF 30212/DF) is the face-to-face (X) matched pair matched-set choice for a 60 mm shaft: a pair of tapered roller bearings whose combined envelope is 110×47.5 mm, delivered ready to mount with controlled internal clearance.Digit by digit, 30212-DF reads as the ISO 355 base bearing 30212 supplied as a face-to-face (X) matched pair matched pair (/DF); the 60 mm bore and 110 mm OD are per-bearing, the 47.5 mm width is for the set.
Typical equipment & failure modes
Common applications
- construction machinery drives
- marine deck machinery shafts
- heavy industrial gearboxes and speed reducers
- rolling-mill auxiliary drives
Known failure patterns
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- 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
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- O and X arrangements are not interchangeable by turning the set around: 30212-DF in face-to-face (X) matched pair arrangement has its load-line geometry fixed — specify the arrangement from the shaft thermal and stiffness analysis.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 30212-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Setting is built into 30212-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.
- The 207/228 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 30212/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 30212-DF?
The SKF 30212/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 47.5 mm overall width (2.362 × 4.331 × 1.87 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 207 kN, C0 228 kN, fatigue load limit Pu 26.5 kN, reference speed 4,000 r/min, limiting speed 6,000 r/min, mass about 1.80 kg.
What does the /DF suffix on 30212-DF mean?
The base 30212 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 30212-DF for one bearing or the pair?
They are for the complete matched pair: C 207 kN dynamic and C0 228 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 30212 table values.
Can 30212-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.