MPNbase

105×225×49 mm bearings

24 models from 3 brands across 4 types share this ISO 15 envelope: 105 mm bore, 225 mm outside diameter, 49 mm width (4.134×8.858×1.929 in), 60 mm radial section.

24 models fit this space 3 brands 24 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)
1321 Self-Aligning Ball NTN open — 154 64.5 9580
6321 Deep Groove Ball SKF open CN 182 153 8200
6321-2RS Deep Groove Ball NSK 2RS CN 202 154 8090
6321-2RS-NTN Deep Groove Ball NTN 2RS CN 204 153 8050
6321-NSK Deep Groove Ball NSK open CN 202 154 8090
6321-NTN Deep Groove Ball NTN open CN 204 153 8050
6321-ZZ Deep Groove Ball SKF ZZ CN 182 153 8250
6321-ZZ-NSK Deep Groove Ball NSK ZZ CN 202 154 8090
6321-ZZ-NTN Deep Groove Ball NTN ZZ CN 204 153 8050
7321 Angular Contact Ball SKF open CN 203 193 8550
7321-BECBP Angular Contact Ball SKF open CN 216 208 8550
7321-BEP Angular Contact Ball SKF open CN 203 193 8550
7321-DECBM Angular Contact Ball SKF open CN 216 208 8550
7321-NTN Angular Contact Ball NTN open CN 244 210 8200
7321B Angular Contact Ball NTN open CN 224 194 8360
N321 Cylindrical Roller NTN open CN 355 360 8330
N321-ECP Cylindrical Roller SKF open CN 500 500 8600
NF321 Cylindrical Roller NTN open CN 355 360 8330
NJ321 Cylindrical Roller NTN open CN 355 360 8330
NJ321-ECP Cylindrical Roller SKF open CN 500 500 9050
NU321 Cylindrical Roller NTN open CN 355 360 8330
NU321-ECP Cylindrical Roller SKF open CN 500 500 8500
NUP321 Cylindrical Roller NTN open CN 355 360 8330
QJ321 Angular Contact Ball NTN open CN 305 585 10400

Note: catalogue dynamic load ratings for this envelope span 154.0– 500.0 kN — a 225% spread between designs in the very same 105×225×49 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 105 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 1321, 6321, 6321-2RS, 6321-2RS-NTN, 6321-NSK, 6321-NTN, 6321-ZZ, 6321-ZZ-NSK, 6321-ZZ-NTN, 7321, 7321-BECBP, 7321-BEP, 7321-DECBM, 7321-NTN, 7321B, N321, N321-ECP, NF321, NJ321, NJ321-ECP, NU321, NU321-ECP, NUP321, QJ321.

Frequently asked questions

Are all 105×225×49 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 105 mm bore, 225 mm OD, 49 mm width (4.134×8.858×1.929 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 24 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 105×225×49?

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 105×225×49 mm in inches?

105×225×49 mm converts to 4.134×8.858×1.929 in, with a 60 mm (2.362 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 1321, 6321, 6321-2RS mount in the same space despite different internal designs.