61838-RSR bearing: complete specifications & equivalents
The 61838-RSR is a ISO 15 radial bearing sized 190 x 240 x 24 mm (bore x OD x width) with RSR sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NSK |
| Bore diameter d | 190 mm |
| Outer diameter D | 240 mm |
| Width B | 24 mm |
| Material | GCr15 |
| Seal / shield | RSR |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 80.5 kN |
| Basic static load rating C0 | 93.5 kN |
| Mass | 2530 g |
| Manufacturer designation | NSK 6838VV |
| Standard | ISO 15 |
| Catalog version | NSK Rolling Bearings E1103 Part C |
| Last verified | 2026-09-24 |
Source: catalog reference (NSK Rolling Bearings E1103 Part C) · extracted 2026-09-24
Dimensions in inches & 61800-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 0.945 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in 61800-series | 10 mm |
| Largest outer diameter in 61800-series | 420 mm |
| Width range across 61800-series | 5–38 mm |
| Bore position in 61800-series (smallest first) | 31 of 39 |
| Bore above smallest 61800-series size | 180 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61838 | ISO-INTERCHANGE | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 envelope interchange; NSK suffix 6838VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue. |
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 61838-RSR model number is decoded
In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.
Typical equipment & failure modes
Common applications
- textile machinery
- packaging machinery
- space-constrained gearboxes
- clutch and transmission assemblies
Known failure patterns
- ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)
- lip-lubricant starvation if the bearing runs dry for extended periods
- fretting corrosion on a loose shaft seat
- cage damage from operation beyond the limiting speed
Selection pitfalls — read before you substitute
- Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.
- The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.
- RSR low-friction seals on 61838-RSR run faster than contact-seal 61838-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61838-2RS instead.
- The non-contact lip of 61838-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 190 mm bore position before relying on it as sealed-for-life.
- Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.
- NSK catalogues this low-friction non-contact seal as 6838VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.
- The 80.5/93.5 kN ratings, mass 2530 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6838VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive.
Frequently asked questions
What are the dimensions of a 61838-RSR bearing?
A 61838-RSR deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals.
How does the 61838 bore code work?
The last two digits of 61838 are bore code 38, giving 38 × 5 = 190 mm bore. The 240 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone.
What does the RSR suffix on 61838-RSR mean?
RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments.
How does the 61800 compare with other series at the same 190 mm bore?
618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance.
What is the NSK designation and catalogue data for 61838-RSR?
In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6838VV — two low-friction non-contact rubber seals (NSK suffix VV), 190×240×24 mm per ISO 15. Quoted values: C 80.5 kN, C0 93.5 kN, mass 2530 g. The industry-neutral page spelling 61838-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service.
Reviewed & verified by the MPN Base engineering desk against source catalog NSK Rolling Bearings E1103 Part C on 2026-09-24. Read our editorial & correction policy.