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| Parameter | TIMKENNJ338EMA190 × 400 × 78 mm | NSKNJ338EM190 × 400 × 78 mm | KOYONJ338190 × 400 × 78 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | TIMKEN | NSK | KOYO |
| Designation | NJ338EMA | NJ338EM | NJ338 |
| Product family | Cylindrical 1-Row | Cylindrical roller bearing | Single-row / NJ |
| Detailed type | Cylindrical roller bearings | Cylindrical roller bearings | Cylindrical roller bearings |
| Series | EX27728 | — | — |
| Bore diameterd | 190 mm | 190 mm | 190 mm |
| Outside diameterD | 400 mm | 400 mm | 400 mm |
| WidthB | 78 mm | 78 mm | 78 mm |
| Basic dynamic load ratingC | 1300 kN | 1300 kN | 1220 kN |
| Basic static load ratingC0 | 1500 kN | 1340 kN | 1260 kN |
| Fatigue load limitPu | — | — | 146 kN |
| Limiting speednG | — | — | 1300 r/min |
| Mass≈m | 50.2 kg | — | 53.5 kg |
| Sealing | Open | — | — |
| Cage | Window Brass cage | Machined brass | — |
| Boundary dimensions | |||
| Bearing widthB | — | 78 mm | — |
| Minimum bearing chamferr min. | — | 5 mm | — |
| Minimum secondary bearing chamferr1 min. | — | 5 mm | — |
| Roller inscribed circle diameterFw | — | 245 mm | — |
| Calculation Factors | |||
| K Factor | 0.00 | — | — |
| Y1 Factor | 0.00 | — | — |
| Y2 Factor | 0.00 | — | — |
| Y0 Factor | 0.00 | — | — |
| E Factor | 0.00 | — | — |
| Cg Factor | 0.1426 | — | — |
| Catalogue reference mass | |||
| Approximate shared-row mass — not separately stated for each rib arrangement | — | 50.6 kg | — |
| Classification | |||
| Official Category Path | — | — | Cylindrical roller bearings - Single-row - NJ |
| Official Classification 1 | — | — | Cylindrical roller bearings / Single-row / NJ |
| Construction | |||
| Single-row construction type | — | NJ | — |
| Rib arrangement | — | Two outer-ring ribs; one inner-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 | — | 1300000 N | — |
| Basic static radial load ratingC0r | — | 1340000 N | — |
| Lubrication-qualified speed — standard cage | |||
| Thermal speed rating — oil bath | — | 1600 r/min | — |
| Mechanical limiting speed — forced oil circulation | — | 2600 r/min | — |
| Limiting speed — grease | — | 1400 r/min | — |
| Limiting speed — oil bath | — | 1700 r/min | — |
| Manufacturer Identity | |||
| Material Number | 000000000190019430 | — | — |
| Official Class Key | — | — | 040-010-000 |
| World Assembly Part Number | NJ338EMA | — | — |
| Inner Ring Part Number | 190ARJE03 | — | — |
| Outer Ring Part Number | 190ERUE03 | — | — |
| Drawing Number | M103411 | — | — |
| Upc | 0053893773896 | — | — |
| Official Source System | CORE BP - DS DF | — | — |
| Official Last Run | 2026-08-23T20:02:46.143 | — | — |
| Mounting dimensions — shown arrangement | |||
| Minimum shaft shoulder diameterdb min. | — | 210 mm | — |
| Maximum housing shoulder diameterDa max. | — | 380 mm | — |
| Maximum adjusting-ring diameter (NU/NJ arrangement)db max. | — | 240 mm | — |
| Maximum adjacent fillet radiusra max. | — | 4 mm | — |
| Maximum secondary adjacent fillet radiusrb max. | — | 4 mm | — |
| Product Identity | |||
| Type Description | Cylindrical 1-Row | — | — |
| Construction | Single Row Cylindrical Roller Bearing | Imperial Series | 7.4803 in Bore | 15.7480 in OD | 3.0709 in Width | Open | Cylindrical Bore | Machined Window Brass Cage | C0 Clearance | — | — |
| Number Of Rows | 1 | — | — |
| Tapered Bore | N | — | — |
| Technical Data | |||
| d | — | — | 400 mm |
| B | — | — | 78 mm |
| R(Min.) | — | — | 5 mm |
| R1(Min.) | — | — | 5 mm |
| Overall Width | 0.000 mm | — | — |
| Fw | — | — | 245 mm |
| Radial Rating | 1,300,000 N | — | — |
| Ew | — | — | - mm |
| Axial Rating | 0 N | — | — |
| Basic Load Ratings : Cr | — | — | 1220 kN |
| Dynamic Rating C1 | 1,300,000 N | — | — |
| Basic Load Ratings : C0R | — | — | 1260 kN |
| Dynamic Rating C90 | 0 N | — | — |
| Fatigue Load Limit : Cu | — | — | 146 kN |
| Dynamic Axial Rating Ca90 | 0 N | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 1300 min-1 |
| Dynamic Axial Rating Ca1 | 0 N | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 1800 min-1 |
| Static Radial Rating C0 | 1,500,000 N | — | — |
| Sd1 | — | — | - mm |
| Extended Dynamic Rating Ce | 0 N | — | — |
| B1 | — | — | - mm |
| Static Axial Rating C0A | 0 N | — | — |
| B2 | — | — | - mm |
| Da(Min.) | — | — | - mm |
| Db(Min.) | — | — | - mm |
| Db(Max.) | — | — | - mm |
| Dc(Min.) | — | — | - mm |
| Dd(Min.) | — | — | - mm |
| Da(Max.) | — | — | 380 mm |
| Ra(Max.) | — | — | 4 mm |
| Rb(Max.) | — | — | 4 mm |
| Mass(Refer.) | — | — | 53.5 kg |
Independent reference comparison based on the manufacturer data currently loaded. Always verify current limits, tolerances and suffix definitions with the official source before engineering selection.