W6307-2RS bearing: complete specifications & equivalents
The W6307-2RS is a ISO 15 radial bearing sized 35 x 80 x 21 mm (bore x OD x width) with 2RS sealing. 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 | 21 mm |
| Material | SS440C |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 28.6 kN |
| Basic static load rating C0 | 19 kN |
| Fatigue load limit Pu | 0.815 kN |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 441 g |
| Manufacturer designation | W 6307-2RS1 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 & 6300-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.827 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in 6300-series | 2 mm |
| Largest outer diameter in 6300-series | 500 mm |
| Width range across 6300-series | 3–95 mm |
| Bore position in 6300-series (smallest first) | 14 of 40 |
| Bore above smallest 6300-series size | 33 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6307-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK NSK 6307VV shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 36.5/19.2 kN) — the stainless execution is not a load-rating equivalent. |
| 6307-M | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| 307 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.6/19 kN vs 34.7/26.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| 307-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×80×21 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (28.6/19 kN vs 34.7/26.5 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| 6307 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6307 shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — the stainless execution is not a load-rating equivalent. |
| 6307-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6307-2Z shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — the stainless execution is not a load-rating equivalent. |
| 6307-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6307-2RSH shares the 35×80×21 mm envelope but carries different catalogue ratings (28.6/19 kN vs 35.1/19 kN) — the stainless execution is not a load-rating equivalent. |
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 W6307-2RS model number is decoded
The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 6300-series, the last two digits encode the bore: 6307 carries code 07 = 35 mm (code × 5). Envelope 35×80×21 mm (1.378×3.15×0.827 in), C 28.6 kN, C0 19 kN, Pu 0.815 kN; limiting speed 5600 r/min and mass 441 g. SKF catalogues the sealed execution as W 6307-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.
Typical equipment & failure modes
Common applications
- pharmaceutical and packaging machines
- washdown-duty equipment
- chemical and marine atmospheres
- medical and laboratory devices
Known failure patterns
- surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty
- seal and grease failure before the rings corrode in sustained washdown service
- contact-seal lip hardening and pre-grease loss after long high-temperature service
- grease-life expiry inside the sealed-for-life cavity, which has no relubrication path
Selection pitfalls — read before you substitute
- W-prefix stainless rings (X108CrMo17 / AISI 440C class) resist moisture and weak chemicals but will still rust in chloride-rich or salt-spray duty without protection — W6307-2RS is not marine-grade stainless.
- The stainless steel is martensitic and MAGNETIC; do not reject W6307-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.
- Stainless bearings carry lower load ratings than chrome steel of the same envelope: W6307-2RS is quoted at C 28.6 kN versus the 21 mm-wide 52100 version — do not swap on dimensions alone.
- Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W6307-2RS; standard fill is industrial grease unless specified otherwise.
- At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
- Assign interference to the rotating ring: on a conventional shaft-mounted 35 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
Frequently asked questions
What are the dimensions of the stainless W6307-2RS?
SKF W 6307-2RS1 measures 35×80×21 mm (1.378×3.15×0.827 in), about 441 g, C 28.6 kN.
What does the W in W 6307-2RS1 mean?
W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules.
Where is W6307-2RS typically used?
Food and packaging machines, pharmaceutical equipment, washdown conveyors, chemical and marine-atmosphere drives and appliances exposed to moisture.
What grease is supplied in W6307-2RS?
Sealed units are pre-greased for life; for food or pharmaceutical duty order (or re-grease before service) with an NSF H1 registered food-grade grease.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.