MPNbase

440×650×157 mm bearings

8 models from 2 brands across 4 types share this ISO 15 envelope: 440 mm bore, 650 mm outside diameter, 157 mm width (17.323×25.591×6.181 in), 105 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)
23088B Spherical Roller NTN open CN 3650 6850 181000
23088BK Spherical Roller NTN open CN 3650 6850 175000
323088UTG Tapered Roller NTN open CN 3350 5450 180000
413088UTG Tapered Roller NTN open CN 3150 5150 160000
C3088-KMB CARB Toroidal Roller SKF open CN 3750 6400 190000
C3088-MB CARB Toroidal Roller SKF open CN 3750 6400 190000
NN3088 Cylindrical Roller NTN open CN 2680 5100 178000
NN3088K Cylindrical Roller NTN open CN 2680 5100 172000

Note: catalogue dynamic load ratings for this envelope span 2680.0– 3750.0 kN — a 40% spread between designs in the very same 440×650×157 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 440 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 23088B, 23088BK, 323088UTG, 413088UTG, C3088-KMB, C3088-MB, NN3088, NN3088K.

Frequently asked questions

Are all 440×650×157 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 440 mm bore, 650 mm OD, 157 mm width (17.323×25.591×6.181 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 440×650×157?

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 440×650×157 mm in inches?

440×650×157 mm converts to 17.323×25.591×6.181 in, with a 105 mm (4.134 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 23088B, 23088BK, 323088UTG mount in the same space despite different internal designs.