6012-ZZ bearing: complete specifications & equivalents
The 6012-ZZ is a ISO 15 radial bearing sized 60 x 95 x 18 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 60 mm |
| Outer diameter D | 95 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 30.7 kN |
| Basic static load rating C0 | 23.2 kN |
| Fatigue load limit Pu | 0.98 kN |
| Reference speed (thermal) | 15000 rpm |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -30 to +120 °C |
| Mass | 430 g |
| Manufacturer designation | SKF 6012-2Z |
| 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 & 6000-series range
| Bore d | 2.362 in |
|---|---|
| Outer diameter D | 3.74 in |
| Width B | 0.709 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in 6000-series | 4 mm |
| Largest outer diameter in 6000-series | 1150 mm |
| Width range across 6000-series | 4–155 mm |
| Bore position in 6000-series (smallest first) | 19 of 61 |
| Bore above smallest 6000-series size | 56 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6012 | 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. |
| 6012-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty. |
| 6012-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty. |
| 6012-RSR-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty. |
| 6012-ZZ-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. |
| 6012-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty. |
| 6012-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty. |
| 6012-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty. |
| 6012-ZZ-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. |
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 6012-ZZ model number is decoded
6012-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 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. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6012-2Z.
Typical equipment & failure modes
Common applications
- centrifugal and positive-displacement pumps
- gearboxes and speed reducers
- conveyor drives
- material-handling equipment
Known failure patterns
- fine-particle abrasion when non-contact shields let dust past in dirty duty
- grease aging in the shield-for-life cavity with 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
- At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.
- Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.
- ZZ shields are non-contact: 6012-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.
- Do not wash 6012-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.
- Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6012-ZZ drags the lip and overheats it.
- A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.
- SKF spells the shielded version 6012-2Z (one shield: 6012-Z), not "-ZZ": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.
- The single-shield execution 6012-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6012-2Z for high-contamination positions.
- The 30.7/23.2 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 6012-ZZ bearing?
A 6012-ZZ deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields.
What does the ZZ suffix on 6012-ZZ mean?
ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing.
How does the 6000 compare with other series at the same 60 mm bore?
The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces.
Are 6012 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6012 uses the same ISO 15 envelope (60×95×18 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 6012-ZZ?
In the SKF Rolling Bearings catalogue this size is listed as 6012-2Z — two non-contact sheet-metal shields, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-ZZ.
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.