6320-M bearing: complete specifications & equivalents
The 6320-M is a ISO 15 radial bearing sized 100 x 215 x 47 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 215 mm |
| Width B | 47 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 174 kN |
| Basic static load rating C0 | 140 kN |
| Fatigue load limit Pu | 4.75 kN |
| Reference speed (thermal) | 6700 rpm |
| Limiting speed (mechanical) | 6000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8700 g |
| Manufacturer designation | 6320 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 | 3.937 in |
|---|---|
| Outer diameter D | 8.465 in |
| Width B | 1.85 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 57.5 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) | 27 of 40 |
| Bore above smallest 6300-series size | 98 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6320-2RS-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6320DDU on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6320-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6320VV on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6320-ZZ-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6320ZZ on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6320 | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6320 on the same 100×215×47 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6320-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6320 on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check. |
| 6320-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6320LLU on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check. |
| 6320-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6320LLB on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check. |
| 6320-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6320ZZ on the same 100×215×47 mm envelope, but catalogue C/C0 differ (174/140 kN vs 192/141 kN) — envelope interchange only after a load check. |
| 6320-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6320-2Z (two non-contact shields) shares the 100×215×47 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6320-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6320-2RS1 (two contact elastomer seals) shares the 100×215×47 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 6320-M model number is decoded
In the 6300-series, the last two digits encode the bore: 6320 carries code 20 = 100 mm (code × 5). The envelope is 100×215×47 mm (3.937×8.465×1.85 in) with a 57.5 mm radial section height, C 174 kN, C0 140 kN and Pu 4.75 kN. The open 6320 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 6000 r/min, catalogue mass 8700 g.
Typical equipment & failure modes
Common applications
- compressor drives
- machine tool auxiliaries
- agricultural gearboxes
- industrial electric motors
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
- Do not preload 6320-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Fillet radii must clear the 6320-M chamfer so the 47 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6320-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 8700 g quoted mass includes the heavier cage.
- Open 6320-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 6320-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Deep-groove geometry tolerates only minutes of misalignment; if the 215 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6320-M.
- Where two 6320 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.
- For positions that need relubrication, choose the open execution of 6320 and design the housing with a grease path; shielded and sealed versions are intended as fit-and-forget units.
Frequently asked questions
What are the dimensions of 6320-M?
The SKF 6320 M measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 8700 g. It is open, with no shields or seals.
How does the bore code in 6320 work?
The final two digits of 6320 are bore code 20, multiplied by 5 to give 100 mm.
What internal clearance does 6320-M have?
Standard supply is normal CN radial clearance unless a suffix states otherwise; for tight fits or hot shafts SKF lists the C3 execution of the same size — the residual clearance left after mounting is what governs running life.
How long can a greased 6320-M be stored?
Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly.
What load can 6320-M take?
Catalogue values for 6320 M: dynamic C 174 kN, static C0 140 kN, fatigue limit Pu 4.75 kN. Use C in life calculation and C0 for static checks at 100 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.