30236-DF bearing: complete specifications & equivalents
The 30236-DF is a ISO 355 radial bearing sized 180 x 320 x 114 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 180 mm |
| Outer diameter D | 320 mm |
| Width B | 114 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1079 kN |
| Basic static load rating C0 | 1630 kN |
| Fatigue load limit Pu | 160 kN |
| Reference speed (thermal) | 1200 rpm |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 35500 g |
| Manufacturer designation | SKF 30236/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 | 7.087 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 4.488 in |
| ISO bore code | 36 |
| Radial section height (D−d)/2 | 70 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) | 25 of 35 |
| Bore above smallest matched-df-series size | 155 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30236 | 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 30236-DF model number is decoded
A matched /DF set needs no setting adjustment at mounting: the clearance is built in; the assembler's job is clean seats, correct fits (m6 on a 180 mm rotating shaft) and square abutments.SKF 30236/DF belongs to the SKF matched tapered-roller range — the 180 mm bore entry in face-to-face (X) matched pair arrangement, dimensioned 320 mm OD and 114 mm overall width for the pair.Digit by digit, 30236-DF reads as the ISO 355 base bearing 30236 supplied as a face-to-face (X) matched pair matched pair (/DF); the 180 mm bore and 320 mm OD are per-bearing, the 114 mm width is for the set. 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 114 mm overall width of 30236-DF is the axial space the pair occupies. The C0/C balance of the pair is about 1.51; combined with the 160 kN fatigue limit this frames a set sized for reversing combined load on a 180 mm shaft rather than for pure radial duty. Assembly datum check: verify the 114 mm width against the drawing before clamping — the width is the assembled result and the quickest field check that the correct execution of 30236-DF is on the shaft. Thermal behaviour of the pair: heat generated in the 180 mm bore cones flows along the shaft and changes the setting; the /DF clearance class is chosen for the catalogue speed range 1,200–2,000 r/min, so re-select the clearance class if the application runs hotter.
Typical equipment & failure modes
Common applications
- marine propulsion gearboxes
- large industrial mixer shafts
- offshore winch and drawworks drums
- large crusher and mineral-processing drives
Known failure patterns
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- 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
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- O and X arrangements are not interchangeable by turning the set around: 30236-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.
- Setting is built into 30236-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.
- Replace 30236-DF as a complete set: pairing a new bearing with a worn partner leaves the clearance undefined even when the designation matches.
- The 1079/1630 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 30236/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 30236-DF?
The SKF 30236/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 180 mm bore, 320 mm outer diameter and 114 mm overall width (7.087 × 12.598 × 4.488 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1079 kN, C0 1630 kN, fatigue load limit Pu 160 kN, reference speed 1,200 r/min, limiting speed 2,000 r/min, mass about 35.50 kg.
What does the /DF suffix on 30236-DF mean?
The base 30236 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 30236-DF for one bearing or the pair?
They are for the complete matched pair: C 1079 kN dynamic and C0 1630 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 30236 table values.
Can 30236-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 180 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 180 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.