61860 bearing: complete specifications & equivalents
The 61860 is a ISO 15 radial bearing sized 300 x 380 x 38 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 300 mm |
| Outer diameter D | 380 mm |
| Width B | 38 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 | 172 kN |
| Basic static load rating C0 | 245 kN |
| Fatigue load limit Pu | 5.6 kN |
| Reference speed (thermal) | 3200 rpm |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 8900 g |
| Manufacturer designation | SKF 61860 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-24 |
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 & 61800-series range
| Bore d | 11.811 in |
|---|---|
| Outer diameter D | 14.961 in |
| Width B | 1.496 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 61800-series | 1 mm |
| Largest outer diameter in 61800-series | 1820 mm |
| Width range across 61800-series | 1–140 mm |
| Bore position in 61800-series (smallest first) | 47 of 74 |
| Bore above smallest 61800-series size | 299 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61860 | 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. |
| 61860-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 300×380×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61860-MA | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 61860 MA (machined brass cage, open arrangement) is the same-size execution on the 300×380×38 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 61860 model number is decoded
61860 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 380 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 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
- lay shafts and idler shafts
- textile machinery
- packaging machinery
- space-constrained gearboxes
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- fretting corrosion on a loose shaft seat
- cage damage from operation beyond the limiting speed
Selection pitfalls — read before you substitute
- At 300 mm bore the ring mass is significant: heat 61860 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.
- Only 40.0 mm of radial section separates bore and OD on the 618xx series at 300 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6260.
- The open 61860 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×380×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Storage matters for open bearings: 61860 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.
- Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61860 drags the lip and overheats it.
- Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.
- The open 61860 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61860-2Z (shields) and 61860-2RSH (contact seals), not suffix-free 61860.
- The 172/245 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 61860 bearing?
A 61860 deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
Are 61860 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 61860 uses the same ISO 15 envelope (300×380×38 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 61860 have?
Unless a clearance suffix says otherwise, 61860 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 61860 and verify the residual clearance after mounting.
How should 61860 be mounted?
Apply the mounting force to the ring being fitted: on a 300 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 is the SKF designation and catalogue data for 61860?
In the SKF Rolling Bearings catalogue this size is listed as 61860 — the open (unsealed) execution, 300×380×38 mm per ISO 15. Quoted values: C 172 kN, C0 245 kN, Pu 5.6 kN, limiting speed 2000 r/min, mass 8900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61860.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-24. Read our editorial & correction policy.