6240 bearing: complete specifications & equivalents
The 6240 is a ISO 15 radial bearing sized 200 x 360 x 58 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 200 mm |
| Outer diameter D | 360 mm |
| Width B | 58 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 270 kN |
| Basic static load rating C0 | 310 kN |
| Fatigue load limit Pu | 7.8 kN |
| Reference speed (thermal) | 3600 rpm |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 23500 g |
| Manufacturer designation | SKF 6240 |
| 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 & 6200-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 2.283 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 80 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) | 40 of 45 |
| Bore above smallest 6200-series size | 197 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6240 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
| 6240-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. |
| 6240-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 200×360×58 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 6240-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. |
| 6240-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 6240 M (machined brass cage, open arrangement) is the same-size execution on the 200×360×58 mm envelope with ratings within 10 % — 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 6240 model number is decoded
6240 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 360 mm outside diameter and 58 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.
Typical equipment & failure modes
Common applications
- industrial fans and blowers
- hoists and winches
- heavy conveyors
- pulp and paper machinery
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- false brinelling from vibration while the shaft is stationary
- fretting corrosion on a loose shaft seat
Selection pitfalls — read before you substitute
- Large bores like the 200 mm of 6240 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.
- The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.
- Storage matters for open bearings: 6240 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 6240 units.
- Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.
- Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.
- The open 6240 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6240-2Z (shields) and 6240-2RSH (contact seals), not suffix-free 6240.
- The 270/310 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 6240 bearing?
A 6240 deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
What internal clearance does 6240 have?
Unless a clearance suffix says otherwise, 6240 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 6240 and verify the residual clearance after mounting.
How should 6240 be mounted?
Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals.
What lubrication does 6240 need?
The open 6240 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval.
What is the SKF designation and catalogue data for 6240?
In the SKF Rolling Bearings catalogue this size is listed as 6240 — the open (unsealed) execution, 200×360×58 mm per ISO 15. Quoted values: C 270 kN, C0 310 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 23500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6240.
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.