6317-M bearing: complete specifications & equivalents
The 6317-M 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 |
| Tolerance class | P0 |
| Cage | brass |
| 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) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5200 g |
| Manufacturer designation | 6317 M |
| 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 | 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-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6317VV on the same 85×180×41 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 317 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope as SKF 317, but catalogue C/C0 differ (140/96.5 kN vs 147/146 kN) — envelope match only after a load check. |
| 317-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope as SKF 317-2Z, but catalogue C/C0 differ (140/96.5 kN vs 147/146 kN) — envelope match only after a load check. |
| 6317 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6317 (open arrangement) shares the 85×180×41 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6317-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6317-2Z (two non-contact shields) shares the 85×180×41 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6317-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6317-2RS1 (two contact elastomer seals) shares the 85×180×41 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
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-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6317 carries code 17 = 85 mm (code × 5). The envelope is 85×180×41 mm (3.346×7.087×1.614 in) with a 47.5 mm radial section height, C 140 kN, C0 96.5 kN and Pu 3.55 kN. The open 6317 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 7500 r/min, catalogue mass 5200 g.
Typical equipment & failure modes
Common applications
- agricultural gearboxes
- industrial electric motors
- gearboxes and speed reducers
- centrifugal and positive-displacement pumps
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- false brinelling from vibration while the shaft stands idle
- fretting corrosion on a creeping shaft or housing seat
Selection pitfalls — read before you substitute
- The fatigue load limit is 3.55 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- Fillet radii must clear the 6317-M chamfer so the 41 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6317-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 5200 g quoted mass includes the heavier cage.
- Open 6317-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
- Plan a relubrication interval for 6317-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Assign interference to the rotating ring: on a conventional shaft-mounted 85 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 6317-M?
The SKF 6317 M measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 5200 g. It is open, with no shields or seals.
How does the bore code in 6317 work?
The final two digits of 6317 are bore code 17, multiplied by 5 to give 85 mm.
What is the difference between 6317-M and a same-bore 62-series bearing?
Section height differs: 6317-M has a 47.5 mm radial section and C 140 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 6317-M?
With a rotating inner ring use roughly k5 on the shaft and H7 in the 180 mm housing; reverse the interference if the outer ring rotates.
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.