30307R bearing: complete specifications & equivalents
The 30307R is a ISO 355 radial bearing sized 35 x 80 x 22.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 35 mm |
| Outer diameter D | 80 mm |
| Width B | 22.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 88.9 kN |
| Basic static load rating C0 | 73.5 kN |
| Fatigue load limit Pu | 8.3 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 530 g |
| Manufacturer designation | SKF 30307 R |
| 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 & flanged-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.896 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in flanged-series | 35 mm |
| Largest outer diameter in flanged-series | 140 mm |
| Width range across flanged-series | 19–45.5 mm |
| Bore position in flanged-series (smallest first) | 1 of 5 |
| Bore above smallest flanged-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30307 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same d/D/T boundary as the plain single-row base bearing, but the flanged cup changes housing location — not a drop-in substitute where the flange is the axial register. |
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 30307R model number is decoded
30307R is a single-row tapered roller bearing with a flanged outer ring, listed by SKF in SKF catalogue PUB BU/P1 17000: the integral flange on the cup lets the housing skip a machined shoulder on one side, so axial location comes from the flange face rather than an abutment.Reading the designation: the leading digits 30307 follow the ISO 355 single-row tapered-roller convention (type 3, dimension series, bore code for the 35 mm bore), and the trailing letter marks the flanged outer ring execution — the boundary dimensions 35×80×22.75 mm match the plain-bearing plan, the flange adds only axial location. Where the flange earns its keep: through-bored housings, sheet-metal or cast covers, and split housings where a machined shoulder would be awkward — the 80 mm cup with its flange locates axially without extra parts. The 8.3 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.83 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Material and manufacturing detail: the 530 g catalogue mass reflects through-hardened bearing steel machined to the listed envelope; ring roundness and width tolerance keep the mounted-setting scatter inside the catalogue class. Reversing-thrust shafts need a second tapered bearing facing 30307R; the flange handles location on one side only, it does not make the bearing a double-direction unit.
Typical equipment & failure modes
Common applications
- machine-tool spindles
- belt-driven fan and blower shafts
- axle-boxes in material-handling equipment
- belt-driven fan and blower shafts
Known failure patterns
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- hard-particle indentation of the tapered raceway in unfiltered oil
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- The flange does not change the one-direction thrust rule: 30307R still needs a second tapered bearing facing it on reversing-thrust shafts, with the running clearance set at mounting.
- Check housing face runout where the flange seats: a face out of square cocks the 22.75 mm-wide cup and concentrates load on one rib — the usual root cause of early flanged-bearing noise.
- The flange does not change the one-direction thrust rule: 30307R still needs a second tapered bearing facing it on reversing-thrust shafts, with the running clearance set at mounting.
- The 88.9/73.5 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 30307 R designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 30307R?
The SKF 30307 R is a single-row tapered roller bearing with a flanged outer ring with 35 mm bore, 80 mm outer diameter and 22.75 mm overall width (1.378 × 3.15 × 0.896 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 88.9 kN, C0 73.5 kN, fatigue load limit Pu 8.3 kN, reference speed 7,500 r/min, limiting speed 9,000 r/min, mass about 0.53 kg.
What does the flanged outer ring on 30307R do?
The cup of 30307R carries an integral flange that locates the bearing axially against the housing face, so the housing needs no machined abutment shoulder on the flange side. It simplifies through-bored or cover-mounted housings; the running clearance is still set by cone-versus-cup position at mounting, exactly as for the plain 30307 bearing.
Is 30307R interchangeable with the plain 30307 bearing?
The boundary dimensions 35×80×22.75 mm match the ISO 355 plan of the base bearing, but the flanged cup is a different order number. It is interchangeable only where the housing provides axial location by other means; where the flange is the locating feature, a plain cup cannot substitute.
Can a single 30307R take axial load in both directions?
No — like any single-row tapered roller bearing it reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair (O or X arrangement) for reversing thrust.
What shaft and housing fits suit 30307R?
For a rotating cone on the 35 mm shaft, use a k5 seat; the flanged cup is retained through the flange, so the 80 mm OD seat can be a loose-to-transition fit. Keep housing face runout square so the flange seats without tilting the cup.
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.