6315-2RS bearing: complete specifications & equivalents
The 6315-2RS is a ISO 15 radial bearing sized 75 x 160 x 37 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 | 75 mm |
| Outer diameter D | 160 mm |
| Width B | 37 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 76.5 kN |
| Fatigue load limit Pu | 3 kN |
| Limiting speed (mechanical) | 2800 rpm |
| Operating temperature | -30 to +110 °C |
| Mass | 3150 g |
| Manufacturer designation | SKF 6315-2RS1 |
| 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 | 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 | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting. |
| 6315-2RS-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. |
| 6315-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty. |
| 6315-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty. |
| 6315-ZZ-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty. |
| 6315-2RS-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. |
| 6315-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty. |
| 6315-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty. |
| 6315-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty. |
| 7315 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | — |
| NU315 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | — |
| 21315 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | — |
| 6315-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable. |
| 315 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check. |
| 315-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF 315-2Z shares the 75×160×37 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 6315-2RS model number is decoded
In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6315-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.
Typical equipment & failure modes
Common applications
- centrifugal and positive-displacement pumps
- gearboxes and speed reducers
- conveyor drives
- material-handling equipment
Known failure patterns
- seal-lip hardening and loss of pre-grease in sustained high-temperature service
- grease-life expiry in the sealed-for-life cavity (no relubrication path)
- false brinelling from vibration while the shaft is stationary
- fretting corrosion on a loose shaft seat
Selection pitfalls — read before you substitute
- Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.
- The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.
- Contact seals add drag and heat: 6315-2RS runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.
- Never wash a sealed 6315-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.
- Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6315-2RS drags the lip and overheats it.
- The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-2RS and shows up later as two-point loaded raceway wear.
- SKF catalogues the contact-sealed version as 6315-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6315-RS1, used where one shaft side needs external relubrication.
- A one-seal execution 6315-RS1 exists for arrangements that lubricate through the open side; fitting 6315-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.
- The 119/76.5 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 6315-2RS bearing?
A 6315-2RS deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased.
What does the 2RS suffix on 6315-2RS mean?
2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling.
How does the 6300 compare with other series at the same 75 mm bore?
The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed.
Are 6315 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6315 uses the same ISO 15 envelope (75×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar).
What is the SKF designation and catalogue data for 6315-2RS?
In the SKF Rolling Bearings catalogue this size is listed as 6315-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 2800 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315-2RS.
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.