MPNbase

55×120×43 mm bearings

25 models from 3 brands across 4 types share this ISO 15 envelope: 55 mm bore, 120 mm outside diameter, 43 mm width (2.165×4.724×1.693 in), 32.5 mm radial section.

25 models fit this space 3 brands 25 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)
22311 Spherical Roller SKF open CN 280 280 2450
22311-EK Spherical Roller SKF open CN 280 280 2850
22311EAD1 Spherical Roller NTN open CN 296 274 2310
22311EAKD1 Spherical Roller NTN open CN 296 274 2260
22311EMD1 Spherical Roller NTN open CN 296 274 2340
22311EMKD1 Spherical Roller NTN open CN 296 274 2290
2311 Self-Aligning Ball NTN open — 76.5 24 2080
2311-K Self-Aligning Ball SKF open CN 76.1 24 2100
2311K Self-Aligning Ball NTN open — 76.5 24 2080
4311-ATN9 Deep Groove Ball SKF open CN 97.5 83 2150
62311-2RS Deep Groove Ball SKF 2RS CN 71.5 45 2050
N2311 Cylindrical Roller NTN open CN 164 162 2130
N2311EA Cylindrical Roller NTN open CN 238 233 2230
NF2311EA Cylindrical Roller NTN open CN 238 233 2230
NJ2311 Cylindrical Roller NTN open CN 164 162 2130
NJ2311-ECP Cylindrical Roller SKF open CN 232 232 2250
NJ2311EA Cylindrical Roller NTN open CN 238 233 2230
NJG2311-VH Cylindrical Roller SKF open CN 233 260 2300
NU2311 Cylindrical Roller SKF open CN 232 232 2250
NU2311-NTN Cylindrical Roller NTN open CN 164 162 2130
NU2311EA Cylindrical Roller NTN open CN 238 233 2230
NUP2311 Cylindrical Roller NTN open CN 164 162 2130
NUP2311-ECP Cylindrical Roller SKF open CN 232 232 2300
NUP2311EA Cylindrical Roller NTN open CN 238 233 2230
SL192311-XL Cylindrical Roller FAG open CN 270 250 2280

Note: catalogue dynamic load ratings for this envelope span 71.5– 296.0 kN — a 314% spread between designs in the very same 55×120×43 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 55 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 22311, 22311-EK, 22311EAD1, 22311EAKD1, 22311EMD1, 22311EMKD1, 2311, 2311-K, 2311K, 4311-ATN9, 62311-2RS, N2311, N2311EA, NF2311EA, NJ2311, NJ2311-ECP, NJ2311EA, NJG2311-VH, NU2311, NU2311-NTN, NU2311EA, NUP2311, NUP2311-ECP, NUP2311EA, SL192311-XL.

Frequently asked questions

Are all 55×120×43 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 55 mm bore, 120 mm OD, 43 mm width (2.165×4.724×1.693 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 25 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 55×120×43?

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 55×120×43 mm in inches?

55×120×43 mm converts to 2.165×4.724×1.693 in, with a 32.5 mm (1.280 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 22311, 22311-EK, 22311EAD1 mount in the same space despite different internal designs.