MPNbase

90×190×43 mm bearings

45 models from 3 brands across 5 types share this ISO 15 envelope: 90 mm bore, 190 mm outside diameter, 43 mm width (3.543×7.480×1.693 in), 50 mm radial section.

45 models fit this space 3 brands 45 with catalogue C rating

Dimensional interchange — verify before substituting

These bearings are interchangeable on boundary dimensions per ISO 15 — same bore, OD and width. They are not guaranteed drop-in equivalents: compare load ratings, seals, clearance, cage, precision and axial-locating design for the specific duty. Models without a catalogue C rating on this site carry ISO 15 geometry only; request the manufacturer table before a load-critical replacement.

Model Type Brand Seal Clearance C (kN) C0 (kN) Mass (g)
1318 Self-Aligning Ball NTN open — 117 44.5 5830
1318-K Self-Aligning Ball SKF open CN 117 44 5800
1318K Self-Aligning Ball NTN open — 117 44.5 5830
21318 Spherical Roller SKF open CN 393 450 6100
21318-EK Spherical Roller SKF open CN 393 450 7250
21318-NTN Spherical Roller NTN open CN 355 400 6300
21318K Spherical Roller NTN open CN 355 400 6210
318 Deep Groove Ball SKF open CN 157 160 5400
318-ZZ Deep Groove Ball SKF ZZ CN 157 160 5400
6318 Deep Groove Ball SKF open CN 151 108 4950
6318-2RS Deep Groove Ball SKF 2RS CN 151 108 5100
6318-2RS-NSK Deep Groove Ball NSK 2RS CN 157 107 4980
6318-2RS-NTN Deep Groove Ball NTN 2RS CN 158 107 4910
6318-M Deep Groove Ball SKF open CN 151 108 6100
6318-NSK Deep Groove Ball NSK open CN 157 107 4980
6318-NTN Deep Groove Ball NTN open CN 158 107 4910
6318-RSR Deep Groove Ball NSK RSR CN 157 107 4980
6318-RSR-NTN Deep Groove Ball NTN RSR CN 158 107 4910
6318-ZZ Deep Groove Ball SKF ZZ CN 151 108 5150
6318-ZZ-NSK Deep Groove Ball NSK ZZ CN 157 107 4980
6318-ZZ-NTN Deep Groove Ball NTN ZZ CN 158 107 4910
7318 Angular Contact Ball SKF open CN 156 134 5200
7318-BECBM Angular Contact Ball SKF open CN 166 146 5200
7318-BECBP Angular Contact Ball SKF open CN 166 146 5200
7318-BECBY Angular Contact Ball SKF open CN 166 146 5200
7318-BEGAPH Angular Contact Ball SKF open CN 166 146 5200
7318-BEM Angular Contact Ball SKF open CN 156 134 5200
7318-BEP Angular Contact Ball SKF open CN 156 134 5200
7318-NTN Angular Contact Ball NTN open CN 189 147 5060
7318B Angular Contact Ball NTN open CN 173 135 5160
N318 Cylindrical Roller NTN open CN 266 265 5180
N318-ECP Cylindrical Roller SKF open CN 365 360 5300
NF318 Cylindrical Roller NTN open CN 266 265 5180
NJ318 Cylindrical Roller NTN open CN 266 265 5180
NJ318-ECP Cylindrical Roller SKF open CN 365 360 5450
NJ318E Cylindrical Roller NTN open CN 350 355 —
NU318 Cylindrical Roller SKF open CN 365 360 5250
NU318-NTN Cylindrical Roller NTN open CN 266 265 5180
NU318E Cylindrical Roller NTN open CN 350 355 —
NUP318 Cylindrical Roller NTN open CN 266 265 5180
NUP318-ECJ Cylindrical Roller SKF open CN 365 360 5550
NUP318E Cylindrical Roller NTN open CN 350 355 —
QJ-318-N2MA Angular Contact Ball SKF open CN 285 305 6450
QJ-318-N2PHAS Angular Contact Ball SKF open CN 285 305 6450
QJ318 Angular Contact Ball NTN open CN 235 410 6310

Note: catalogue dynamic load ratings for this envelope span 117.0– 393.0 kN — a 236% spread between designs in the very same 90×190×43 mm space. The higher-rated unit is not an upgrade for every duty (it may run at lower limiting speed), but ignoring the gap will over- or under-life the replacement.

Substitution verification checklist

  1. Load rating. Check C (dynamic) and C0 (static) against the original life calculation — the table above shows which models carry verified catalogue values.
  2. Sealing. Open, -ZZ shields and -2RS contact seals are not equivalent in friction, speed or contamination protection; match the housing environment, not just the suffix on the old box.
  3. Internal clearance. CN/C3/C4 changes with fit and operating temperature; an interference inner-ring mount commonly needs C3 where the bench bearing ran CN.
  4. Cage and precision. Stamped steel, machined brass and polymer cages, and P0/P6/P5 tolerance classes, carry different speed and shock limits.
  5. Locating behaviour. Within one envelope an NU cylindrical roller floats axially while an NJ/NUP locates; ball designs take thrust that roller locating schemes do not. Preserve the shaft's locating arrangement.

Browse all 90 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 1318, 1318-K, 1318K, 21318, 21318-EK, 21318-NTN, 21318K, 318, 318-ZZ, 6318, 6318-2RS, 6318-2RS-NSK, 6318-2RS-NTN, 6318-M, 6318-NSK, 6318-NTN, 6318-RSR, 6318-RSR-NTN, 6318-ZZ, 6318-ZZ-NSK, 6318-ZZ-NTN, 7318, 7318-BECBM, 7318-BECBP, 7318-BECBY, 7318-BEGAPH, 7318-BEM, 7318-BEP, 7318-NTN, 7318B, N318, N318-ECP, NF318, NJ318, NJ318-ECP, NJ318E, NU318, NU318-NTN, NU318E, NUP318, NUP318-ECJ, NUP318E, QJ-318-N2MA, QJ-318-N2PHAS, QJ318.

Frequently asked questions

Are all 90×190×43 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 90 mm bore, 190 mm OD, 43 mm width (3.543×7.480×1.693 in) — so they fit the same shaft, housing bore and axial space. Interchangeability ends at the envelope: dynamic load rating, seal arrangement, internal clearance, cage and precision class differ between the 45 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 90×190×43?

Only after verification. Confirm five things in order: (1) the C/C0 load ratings meet the original life calculation, (2) the seal type is equivalent or acceptable for the contamination level (open vs -ZZ vs -2RS), (3) internal clearance matches (CN/C3/C4 — an interference fit changes residual play), (4) cage material and precision class suit the speed, and (5) the axial-locating behaviour is the same (for example an NU cylindrical roller floats while an NJ locates one way). Same dimensions alone never guarantee equal performance.

What is 90×190×43 mm in inches?

90×190×43 mm converts to 3.543×7.480×1.693 in, with a 50 mm (1.969 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 1318, 1318-K, 1318K mount in the same space despite different internal designs.