6317 bearing: complete specifications & equivalents
The 6317 is a ISO 15 radial bearing sized 85 x 180 x 41 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 85 mm |
| Outer diameter D | 180 mm |
| Width B | 41 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 140 kN |
| Basic static load rating C0 | 96.5 kN |
| Fatigue load limit Pu | 3.55 kN |
| Reference speed (thermal) | 8000 rpm |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 4250 g |
| Manufacturer designation | SKF 6317 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-25 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-24
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 | 3.346 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.614 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 47.5 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) | 24 of 40 |
| Bore above smallest 6300-series size | 83 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6317 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
| 6317-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty. |
| 6317-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 6317-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty. |
| 6317-ZZ-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 6317-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty. |
| 6317-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 6317-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty. |
| 6317-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 7317 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | — |
| NU317 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | — |
| 21317 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | — |
| 6317-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable. |
| 317 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check. |
| 317-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check. |
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 6317 model number is decoded
6317 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.
Typical equipment & failure modes
Common applications
- heavy conveyors
- pulp and paper machinery
- medium and heavy industrial drives
- large gearboxes
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Large bores like the 85 mm of 6317 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.
- The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.
- The open 6317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Storage matters for open bearings: 6317 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.
- Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317.
- Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-C3. No clearance suffix means normal CN clearance.
- The open 6317 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6317-2Z (shields) and 6317-2RSH (contact seals), not suffix-free 6317.
- The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives.
Frequently asked questions
What are the dimensions of a 6317 bearing?
A 6317 deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
What does no suffix on 6317 mean?
A bare 6317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication.
How does the 6300 compare with other series at the same 85 mm bore?
The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed.
Are 6317 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting.
What is the SKF designation and catalogue data for 6317?
In the SKF Rolling Bearings catalogue this size is listed as 6317 — the open (unsealed) execution, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 5000 r/min, mass 4250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-25. Read our editorial & correction policy.