Cross-brand designation analysis
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Same-model Comparison
Explore products that share a base designation across loaded brands, with dimensional agreement and data gaps shown clearly.
Automatic candidate selection
One base designation across loaded brands
Exact designations rank first. Dimensions, suffixes and other technical differences remain visible so the result is not mistaken for an interchangeability declaration.
Designation candidates
“NF238” across 2 loaded brands
One highest-ranked designation candidate is shown per manufacturer. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | NSKNF238M190 × 340 × 55 mm | KOYONF238190 × 340 × 55 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | NSK | KOYO |
| Designation | NF238M | NF238 |
| Product family | Cylindrical roller bearing | Single-row / NF |
| Detailed type | Cylindrical roller bearings | Cylindrical roller bearings |
| Bore diameterd | 190 mm | 190 mm |
| Outside diameterD | 340 mm | 340 mm |
| WidthB | 55 mm | 55 mm |
| Basic dynamic load ratingC | 685 kN | 694 kN |
| Basic static load ratingC0 | 770 kN | 768 kN |
| Fatigue load limitPu | — | 91.3 kN |
| Limiting speednG | — | 1700 r/min |
| Mass≈m | — | 23.4 kg |
| Cage | Machined brass | — |
| Boundary dimensions | ||
| Bearing widthB | 55 mm | — |
| Minimum bearing chamferr min. | 4 mm | — |
| Minimum secondary bearing chamferr1 min. | 4 mm | — |
| Roller circumscribed circle diameterEw | 299 mm | — |
| Catalogue reference mass | ||
| Approximate shared-row mass — not separately stated for each rib arrangement | 22 kg | — |
| Classification | ||
| Official Category Path | — | Cylindrical roller bearings - Single-row - NF |
| Official Classification 1 | — | Cylindrical roller bearings / Single-row / NF |
| Construction | ||
| Single-row construction type | NF | — |
| Rib arrangement | Two inner-ring ribs; one outer-ring rib | — |
| Standard cage material | Machined brass | — |
| Standard cage marking | M | — |
| Other cage codes listed for this catalogue row | None listed in this row | — |
| Precision — designation omission rule | ISO Normal when no precision suffix is specified | — |
| Clearance identification — verify interchangeability | No clearance suffix shown. CN omission applies to interchangeable designs; do not infer a numerical clearance. | — |
| Optimized crowning note | No optimized-crowning asterisk on this row | — |
| Load ratings — standard cage | ||
| Basic dynamic radial load ratingCr | 685000 N | — |
| Basic static radial load ratingC0r | 770000 N | — |
| Lubrication-qualified speed — standard cage | ||
| Thermal speed rating — oil bath | 2200 r/min | — |
| Mechanical limiting speed — forced oil circulation | Not stated in this catalogue row | — |
| Limiting speed — grease | 1800 r/min | — |
| Limiting speed — oil bath | 2200 r/min | — |
| Manufacturer Identity | ||
| Official Class Key | — | 040-010-000 |
| Mounting dimensions — shown arrangement | ||
| Minimum shaft shoulder diameterda min. | 206 mm | — |
| Maximum housing shoulder diameterDb max. | 324 mm | — |
| Minimum housing shoulder diameterDb min. | 305 mm | — |
| Maximum adjacent fillet radiusra max. | 3 mm | — |
| Maximum secondary adjacent fillet radiusrb max. | 3 mm | — |
| Technical Data | ||
| d | — | 340 mm |
| B | — | 55 mm |
| R(Min.) | — | 4 mm |
| R1(Min.) | — | 4 mm |
| Fw | — | - mm |
| Ew | — | 299 mm |
| Basic Load Ratings : Cr | — | 694 kN |
| Basic Load Ratings : C0R | — | 768 kN |
| Fatigue Load Limit : Cu | — | 91.3 kN |
| Limiting Speeds(Grease Lub.) | — | 1700 min-1 |
| Limiting Speeds(Oil Lub.) | — | 2000 min-1 |
| Sd1 | — | - mm |
| B1 | — | - mm |
| B2 | — | - mm |
| Da(Min.) | — | 206 mm |
| Db(Min.) | — | 310 mm |
| Db(Max.) | — | 324 mm |
| Dc(Min.) | — | - mm |
| Dd(Min.) | — | - mm |
| Da(Max.) | — | - mm |
| Ra(Max.) | — | 3 mm |
| Rb(Max.) | — | 3 mm |
| Mass(Refer.) | — | 23.4 kg |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.