6315-M bearing: complete specifications & equivalents
The 6315-M is a ISO 15 radial bearing sized 75 x 160 x 37 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 75 mm |
| Outer diameter D | 160 mm |
| Width B | 37 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 76.5 kN |
| Fatigue load limit Pu | 3 kN |
| Reference speed (thermal) | 9000 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3700 g |
| Manufacturer designation | 6315 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 | 2.953 in |
|---|---|
| Outer diameter D | 6.299 in |
| Width B | 1.457 in |
| ISO bore code | 15 |
| Radial section height (D−d)/2 | 42.5 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) | 22 of 40 |
| Bore above smallest 6300-series size | 73 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6315-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6315VV on the same 75×160×37 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 315 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope as SKF 315, but catalogue C/C0 differ (119/76.5 kN vs 125/116 kN) — envelope match only after a load check. |
| 315-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope as SKF 315-2Z, but catalogue C/C0 differ (119/76.5 kN vs 125/116 kN) — envelope match only after a load check. |
| 6315 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6315 (open arrangement) shares the 75×160×37 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6315-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6315-2Z (two non-contact shields) shares the 75×160×37 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6315-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6315-2RS1 (two contact elastomer seals) shares the 75×160×37 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 6315-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6315 carries code 15 = 75 mm (code × 5). The envelope is 75×160×37 mm (2.953×6.299×1.457 in) with a 42.5 mm radial section height, C 119 kN, C0 76.5 kN and Pu 3 kN. The open 6315 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 5600 r/min, catalogue mass 3700 g.
Typical equipment & failure modes
Common applications
- gearboxes and speed reducers
- centrifugal and positive-displacement pumps
- material-handling equipment
- industrial fans
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
- brinelling from static overload or hammer blows during mounting
Selection pitfalls — read before you substitute
- Assign interference to the rotating ring: on a conventional shaft-mounted 75 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.
- Clearance suffixes follow the seal code in the designation stack (e.g. 6315-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- The M suffix on 6315-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 3700 g quoted mass includes the heavier cage.
- Open 6315-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 6315-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Catalogue ratings for 6315-M (C 119 kN, C0 76.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
Frequently asked questions
What are the dimensions of 6315-M?
The SKF 6315 M measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3700 g. It is open, with no shields or seals.
How does the bore code in 6315 work?
The final two digits of 6315 are bore code 15, multiplied by 5 to give 75 mm.
How heavy is 6315-M?
Catalogue mass is 3700 g for 6315 M; seal and cage executions of the same envelope differ by a few grams.
What load can 6315-M take?
Catalogue values for 6315 M: dynamic C 119 kN, static C0 76.5 kN, fatigue limit Pu 3 kN. Use C in life calculation and C0 for static checks at 75 mm bore.
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.