6205-FAG bearing: complete specifications & equivalents
The 6205-FAG is a ISO 15 radial bearing sized 25 x 52 x 15 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | FAG |
| Bore diameter d | 25 mm |
| Outer diameter D | 52 mm |
| Width B | 15 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 15.9 kN |
| Basic static load rating C0 | 7.8 kN |
| Reference speed (thermal) | 16000 rpm |
| Limiting speed (mechanical) | 21600 rpm |
| Mass | 121 g |
| Manufacturer designation | FAG 6205-C |
| Standard | ISO 15 |
| Catalog version | HR 1 Rolling Bearings (Jan 2020) |
| Last verified | 2026-09-25 |
Source: catalog reference (HR 1 Rolling Bearings (Jan 2020)) · extracted 2026-09-25
Parameters extracted from the official FAG Rolling Bearings catalogue (HR 1 Rolling Bearings (Jan 2020)); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.
Dimensions in inches & 6200-series range
| Bore d | 0.984 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.591 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 13 of 45 |
| Bore above smallest 6200-series size | 22 mm |
Mounting, lubrication & life for 6205-FAG
Recommended fits & mounting
- Rotating inner ring on a 25 mm shaft: k5; housing bore H7 for normal stationary-load outer rings. Reverse the logic if the outer ring rotates.
- Fit by induction heating (max 120 °C) where practical — never drive the ring home through the rolling elements.
- Keep shaft and housing fillet radii below the bearing chamfer so the 15 mm-wide ring seats square on its shoulder.
Lubrication strategy
Open execution: the application supplies lubrication. Use the grease relubrication chart for this bearing — pitch diameter dm = 38.5 mm, so the speed factor at the 21,600 r/min limiting speed is 831,600 mm·r/min. Intervals shorten steeply as that factor rises.
Worked L10 life example (illustrative duty)
For ball bearings, L10h = (C/P)3 · 106 / (60·n). Taking an example radial equivalent load P = 3 kN at n = 1,500 r/min (a small belted motor duty — substitute the real equivalent load from the application calculation):
C = 15.9 kN → L10h ≈ 1,654 hours — a warning that this section is lightly rated for a 3 kN load; a heavier section at the same 25 mm bore is the usual fix
Choosing a section at the same 25 mm bore
| Series | Open execution | OD × width | C (kN) | Limiting speed (r/min) |
|---|---|---|---|---|
| 60xx | 6005-FAG | 47 × 12 | 12.6 | 23,700 |
| 62xx | 6205-FAG | 52 × 15 | 15.9 | 21,600 |
| 63xx | 6305-FAG | 62 × 17 | 26.5 | 17,800 |
| 64xx | 6405-FAG | 80 × 21 | 36.1 | 12,400 |
| 618xx | 61805-FAG | 37 × 7 | 4.3 | 28,000 |
| 619xx | 61905-FAG | 42 × 9 | 7.0 | 24,200 |
| 160xx | 16005 | 47 × 8 | 8.9 | 22,200 |
A larger section is not a drop-in swap — OD and width change — and same-envelope seal variants are compared on the 25×52×15 envelope page. Match meaning, not the size chart alone: see what the cross-reference levels mean.
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6205-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-RSR-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-ZZ-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| 6205-RSR | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| W6205-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| W6205-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
| W6205 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting. |
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 6205-FAG model number is decoded
In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).
Typical equipment & failure modes
Common applications
- conveyors and drives
- agricultural equipment
- fans and blowers
- electric motors
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- brinelling from static overload or hammering during mounting
- false brinelling from vibration while the shaft is stationary
Selection pitfalls — read before you substitute
- At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.
- The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.
- Storage matters for open bearings: 6205-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.
- Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6205 units.
- Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6205-FAG drags the lip and overheats it.
- Never mix components between two 6205-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- The open 6205 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.
- FAG rates 6205 at 21600 r/min mechanical limiting speed (thermal reference speed 16000 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.
- The 25 mm bore puts 6205 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.
- At 15.9 kN dynamic load rating (C) and 7.8 kN static (C0), 6205 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.
- At 121 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.
- The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.
- The 15.9/7.8 kN load ratings, mass 121 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6205-C on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.
- Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6205 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.
- Schaeffler's medias/eKatalog is the live source for the current execution of 6205: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.
Frequently asked questions
What are the dimensions of a 6205-FAG bearing?
A 6205-FAG deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
Are 6205 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting.
What internal clearance does 6205-FAG have?
Unless a clearance suffix says otherwise, 6205-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6205 and verify the residual clearance after mounting.
What is the FAG order number for an open 6205?
FAG lists the open 6205 under the bare designation 6205-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope.
Is 6205-C an X-life bearing?
Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations.
Reviewed & verified by the MPN Base engineering desk against source catalog HR 1 Rolling Bearings (Jan 2020) on 2026-09-25. Read our editorial & correction policy.