33114-DF bearing: complete specifications & equivalents
The 33114-DF is a ISO 355 radial bearing sized 70 x 120 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 | 70 mm |
| Outer diameter D | 120 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 | 361 kN |
| Basic static load rating C0 | 500 kN |
| Fatigue load limit Pu | 57 kN |
| Reference speed (thermal) | 3600 rpm |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3450 g |
| Manufacturer designation | SKF 33114/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 | 2.756 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 2.913 in |
| ISO bore code | 14 |
| 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) | 10 of 35 |
| Bore above smallest matched-df-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33114 | 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 33114-DF model number is decoded
The rotating cones of 33114-DF take a k5 seat on the 70 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.The SKF 33114/DF is a 70×120×74 mm matched tapered-roller set — two single-row bearings in face-to-face (X) matched pair arrangement, ground and shipped together with the axial clearance fixed at the factory.Digit by digit, 33114-DF reads as the ISO 355 base bearing 33114 supplied as a face-to-face (X) matched pair matched pair (/DF); the 70 mm bore and 120 mm OD are per-bearing, the 74 mm width is for the set. Face-to-face matching puts the small rib ends outward, so the pressure cones cross inside the pair; 33114-DF therefore runs cooler where the shaft expands axially, at the price of lower moment stiffness than an O-arrangement of the same 70 mm bore. With a pair mass of 3450 g across the 70×120×74 mm envelope, the set replaces what would otherwise be two separate bearings plus spacer grinding work — the factory setting is the engineering value being purchased. Cross-section geometry: the 25.0 mm half-section ((120−70)/2) places the roller pitch diameter near 95 mm, and the 74 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of 33114-DF. Mounting order matters for 33114-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.
Typical equipment & failure modes
Common applications
- paper-machine and printing rolls
- construction machinery drives
- marine deck machinery shafts
- rolling-mill auxiliary drives
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- roller large-end smearing against the cone rib after EP lubricant film failure
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- brinelling from pressing the cone or cup home through the rollers
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- Replace 33114-DF as a complete set: pairing a new bearing with a worn partner leaves the clearance undefined even when the designation matches.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 33114-DF concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- O and X arrangements are not interchangeable by turning the set around: 33114-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.
- The 361/500 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 33114/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 33114-DF?
The SKF 33114/DF is a matched pair of single-row tapered roller bearings in face-to-face (X) matched pair arrangement with 70 mm bore, 120 mm outer diameter and 74 mm overall width (2.756 × 4.724 × 2.913 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 361 kN, C0 500 kN, fatigue load limit Pu 57 kN, reference speed 3,600 r/min, limiting speed 5,300 r/min, mass about 3.45 kg.
What does the /DF suffix on 33114-DF mean?
The base 33114 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 33114-DF for one bearing or the pair?
They are for the complete matched pair: C 361 kN dynamic and C0 500 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 33114 table values.
Can 33114-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 70 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 70 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.