30220-DF bearing: complete specifications & equivalents
The 30220-DF is a ISO 355 radial bearing sized 100 x 180 x 74 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 180 mm |
| Width B | 74 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 521 kN |
| Basic static load rating C0 | 640 kN |
| Fatigue load limit Pu | 72 kN |
| Reference speed (thermal) | 2400 rpm |
| Limiting speed (mechanical) | 3600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7500 g |
| Manufacturer designation | SKF 30220/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 | 3.937 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 2.913 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 40 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) | 16 of 35 |
| Bore above smallest matched-df-series size | 75 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30220 | 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 30220-DF model number is decoded
Dimensional interchange map: within its boundary plan the 100×180×74 mm envelope of 30220-DF is fixed, so shoulder, spacer and seal drawings can be dimensioned straight from the catalogue table. Mounting order matters for 30220-DF: seat the first bearing, fit the ground spacer, then the second bearing, and clamp axially as a unit — the 74 mm catalogue width is the assembled result and the gauge for correct assembly. The rotating cones of 30220-DF take a k5 seat on the 100 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.30220-DF (SKF 30220/DF) is the face-to-face (X) matched pair matched-set choice for a 100 mm shaft: a pair of tapered roller bearings whose combined envelope is 180×74 mm, delivered ready to mount with controlled internal clearance.Reading the designation: 30220 is the ISO 355 single-row base bearing (100 mm bore), and the suffix /DF marks the matched-set execution — arrangement, spacer grinding and factory clearance class. The pair envelope is 100×180×74 mm; the width covers both bearings of the set. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 30220-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 100 mm bore. Speed planning for the set uses the catalogue pair values: 2,400 r/min thermal reference and 3,600 r/min mechanical limiting speed — a matched pair runs warmer than one bearing because two roller sets share the 74 mm space.
Typical equipment & failure modes
Common applications
- crane sheave and hoist gearboxes
- paper-machine and printing rolls
- construction machinery drives
- paper-machine and printing rolls
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- 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
- grease degradation after long shelf storage without rotation or re-greasing
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- O and X arrangements are not interchangeable by turning the set around: 30220-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 30220-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Setting is built into 30220-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 521/640 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 30220/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 30220-DF?
The SKF 30220/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 100 mm bore, 180 mm outer diameter and 74 mm overall width (3.937 × 7.087 × 2.913 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 521 kN, C0 640 kN, fatigue load limit Pu 72 kN, reference speed 2,400 r/min, limiting speed 3,600 r/min, mass about 7.50 kg.
What does the /DF suffix on 30220-DF mean?
The base 30220 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 30220-DF for one bearing or the pair?
They are for the complete matched pair: C 521 kN dynamic and C0 640 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 30220 table values.
Can 30220-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 100 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 100 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.