MPNbase

140×300×62 mm bearings

8 models from 2 brands across 3 types share this ISO 15 envelope: 140 mm bore, 300 mm outside diameter, 62 mm width (5.512×11.811×2.441 in), 80 mm radial section.

8 models fit this space 2 brands 8 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)
6328 Deep Groove Ball SKF open CN 251 245 18500
6328-M Deep Groove Ball SKF open CN 251 245 21000
6328-ZZ Deep Groove Ball NSK ZZ CN 278 246 18500
7328-BCBM Angular Contact Ball SKF open CN 302 345 21500
NJ328-ECJ Cylindrical Roller SKF open CN 780 830 20000
NU328-ECM Cylindrical Roller SKF open CN 780 830 22500
NUP328-ECM Cylindrical Roller SKF open CN 780 830 23500
QJ-328-N2MA Angular Contact Ball SKF open CN 500 695 24000

Note: catalogue dynamic load ratings for this envelope span 251.0– 780.0 kN — a 211% spread between designs in the very same 140×300×62 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 140 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 6328, 6328-M, 6328-ZZ, 7328-BCBM, NJ328-ECJ, NU328-ECM, NUP328-ECM, QJ-328-N2MA.

Frequently asked questions

Are all 140×300×62 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 140 mm bore, 300 mm OD, 62 mm width (5.512×11.811×2.441 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 8 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 140×300×62?

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 140×300×62 mm in inches?

140×300×62 mm converts to 5.512×11.811×2.441 in, with a 80 mm (3.150 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 6328, 6328-M, 6328-ZZ mount in the same space despite different internal designs.