61928 bearing: complete specifications & equivalents
The 61928 is a ISO 15 radial bearing sized 140 x 190 x 24 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 140 mm |
| Outer diameter D | 190 mm |
| Width B | 24 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 | 66.3 kN |
| Basic static load rating C0 | 72 kN |
| Fatigue load limit Pu | 2.36 kN |
| Reference speed (thermal) | 7000 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 1700 g |
| Manufacturer designation | SKF 61928 |
| 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 & 61900-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 0.945 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in 61900-series | 3 mm |
| Largest outer diameter in 61900-series | 1120 mm |
| Width range across 61900-series | 3–118 mm |
| Bore position in 61900-series (smallest first) | 33 of 63 |
| Bore above smallest 61900-series size | 137 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61928-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. |
| 61928-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty. |
| 61928-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 61928-2RS | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×190×24 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61928-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×190×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61928-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 140×190×24 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| 61928-MA | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 61928 MA (machined brass cage, open arrangement) is the same-size execution on the 140×190×24 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 61928 model number is decoded
In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 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 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. 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
- robotics and automation joints
- lay shafts and idler shafts
- textile machinery
- packaging machinery
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- cage damage from operation beyond the limiting speed
- electrical pitting in VFD-driven motors without grounding protection
Selection pitfalls — read before you substitute
- At 140 mm bore the ring mass is significant: heat 61928 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.
- The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.
- The open 61928 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.
- Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61928 drags the lip and overheats it.
- Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.
- The open 61928 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61928-2Z (shields) and 61928-2RSH (contact seals), not suffix-free 61928.
- The 66.3/72 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 61928 bearing?
A 61928 deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 61900 compare with other series at the same 140 mm bore?
619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated.
Are 61928 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 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 61928 have?
Unless a clearance suffix says otherwise, 61928 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 61928 and verify the residual clearance after mounting.
What is the SKF designation and catalogue data for 61928?
In the SKF Rolling Bearings catalogue this size is listed as 61928 — the open (unsealed) execution, 140×190×24 mm per ISO 15. Quoted values: C 66.3 kN, C0 72 kN, Pu 2.36 kN, limiting speed 4300 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61928.
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.