MPNbase

50×90×32 mm bearings

10 models from 3 brands across 2 types share this ISO 15 envelope: 50 mm bore, 90 mm outside diameter, 32 mm width (1.969×3.543×1.260 in), 20 mm radial section.

10 models fit this space 3 brands 10 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)
33210 Tapered Roller SKF open CN 142 160 860
33210-NTN Tapered Roller NTN open CN 127 158 862
NATR-50-PPA Support Rollers SKF open CN 30.8 58.5 870
NATR50-PP Support Rollers FAG 2RS CN 31 60 867
NATV-50-PPA Support Rollers SKF open CN 39.1 93 970
NATV50-PP Support Rollers FAG 2RS CN 39 93 969
NUTR-50-A Support Rollers SKF open CN 58.3 78 950
NUTR50 Support Rollers FAG open CN 57 88 950
PWTR-50-2RS Support Rollers SKF open CN 42.9 52 950
PWTR50-2RS-XL Support Rollers FAG 2RS CN 46 67 950

Note: catalogue dynamic load ratings for this envelope span 30.8– 142.0 kN — a 361% spread between designs in the very same 50×90×32 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 50 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 33210, 33210-NTN, NATR-50-PPA, NATR50-PP, NATV-50-PPA, NATV50-PP, NUTR-50-A, NUTR50, PWTR-50-2RS, PWTR50-2RS-XL.

Frequently asked questions

Are all 50×90×32 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 50 mm bore, 90 mm OD, 32 mm width (1.969×3.543×1.260 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 10 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 50×90×32?

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 50×90×32 mm in inches?

50×90×32 mm converts to 1.969×3.543×1.260 in, with a 20 mm (0.787 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 33210, 33210-NTN, NATR-50-PPA mount in the same space despite different internal designs.