MPNbase

45×100×25 mm bearings

52 models from 3 brands across 6 types share this ISO 15 envelope: 45 mm bore, 100 mm outside diameter, 25 mm width (1.772×3.937×0.984 in), 27.5 mm radial section.

52 models fit this space 3 brands 52 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)
1309 Self-Aligning Ball NTN open — 38.5 12.7 971
1309-EKTN9 Self-Aligning Ball SKF open CN 39 13.4 960
1309-ETN9 Self-Aligning Ball SKF open CN 39 13.4 960
1309K Self-Aligning Ball NTN open — 38.5 12.7 971
1726309-2RS1 Insert (Y-bearings) SKF 2RS CN 52.7 31.5 800
1726309-B-2RS1-VP274 Insert (Y-bearings) SKF 2RS CN 52.7 31.5 810
21309C Spherical Roller NTN open CN 114 106 927
21309CK Spherical Roller NTN open CN 114 106 912
309 Deep Groove Ball SKF open CN 55 44 880
309-ZZ Deep Groove Ball SKF ZZ CN 55 44 880
6309 Deep Groove Ball SKF open CN 55.3 31.5 840
6309-2RS Deep Groove Ball SKF 2RS CN 55.3 31.5 850
6309-2RS-NSK Deep Groove Ball NSK 2RS CN 58.5 32 829
6309-2RS-NTN Deep Groove Ball NTN 2RS CN 58.5 32 814
6309-M Deep Groove Ball SKF open CN 55.3 31.5 850
6309-NSK Deep Groove Ball NSK open CN 58.5 32 829
6309-NTN Deep Groove Ball NTN open CN 58.5 32 814
6309-RSR Deep Groove Ball NSK RSR CN 58.5 32 829
6309-RSR-NTN Deep Groove Ball NTN RSR CN 58.5 32 814
6309-ZZ Deep Groove Ball SKF ZZ CN 55.3 31.5 870
6309-ZZ-NSK Deep Groove Ball NSK ZZ CN 58.5 32 829
6309-ZZ-NTN Deep Groove Ball NTN ZZ CN 58.5 32 814
7309 Angular Contact Ball SKF open CN 55.9 37.5 820
7309-ACCBM Angular Contact Ball SKF open CN 68 45.5 910
7309-BE-2RZP Angular Contact Ball SKF RSR CN 55.9 37.5 850
7309-BECBM Angular Contact Ball SKF open CN 61 40.5 910
7309-BECBP Angular Contact Ball SKF open CN 61 40.5 820
7309-BECBY Angular Contact Ball SKF open CN 64 45 870
7309-BEGAPH Angular Contact Ball SKF open CN 61 40.5 820
7309-BEP Angular Contact Ball SKF open CN 55.9 37.5 820
7309-NTN Angular Contact Ball NTN open CN 70.5 44 837
7309B Angular Contact Ball NTN open CN 64.5 40.5 854
N309 Cylindrical Roller NTN open CN 82 71 857
N309-ECP Cylindrical Roller SKF open CN 112 100 880
N309EA Cylindrical Roller NTN open CN 115 98.5 865
NF309 Cylindrical Roller NTN open CN 82 71 857
NF309EA Cylindrical Roller NTN open CN 115 98.5 865
NJ309 Cylindrical Roller NTN open CN 82 71 857
NJ309-ECP Cylindrical Roller SKF open CN 112 100 890
NJ309EA Cylindrical Roller NTN open CN 115 98.5 865
NJG309-VH Cylindrical Roller SKF open CN 110 112 940
NU309 Cylindrical Roller SKF open CN 112 100 900
NU309-NTN Cylindrical Roller NTN open CN 82 71 857
NU309EA Cylindrical Roller NTN open CN 115 98.5 865
NUP309 Cylindrical Roller NTN open CN 82 71 857
NUP309-ECP Cylindrical Roller SKF open CN 112 100 930
NUP309EA Cylindrical Roller NTN open CN 115 98.5 865
QJ-309-MA Angular Contact Ball SKF open CN 100 83 1050
QJ-309-N2MA Angular Contact Ball SKF open CN 100 83 1050
QJ-309-N2PHAS Angular Contact Ball SKF open CN 100 83 1050
QJ-309-PHAS Angular Contact Ball SKF open CN 100 83 1050
QJ309 Angular Contact Ball NTN open CN 87 121 1050

Note: catalogue dynamic load ratings for this envelope span 38.5– 115.0 kN — a 199% spread between designs in the very same 45×100×25 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 45 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 1309, 1309-EKTN9, 1309-ETN9, 1309K, 1726309-2RS1, 1726309-B-2RS1-VP274, 21309C, 21309CK, 309, 309-ZZ, 6309, 6309-2RS, 6309-2RS-NSK, 6309-2RS-NTN, 6309-M, 6309-NSK, 6309-NTN, 6309-RSR, 6309-RSR-NTN, 6309-ZZ, 6309-ZZ-NSK, 6309-ZZ-NTN, 7309, 7309-ACCBM, 7309-BE-2RZP, 7309-BECBM, 7309-BECBP, 7309-BECBY, 7309-BEGAPH, 7309-BEP, 7309-NTN, 7309B, N309, N309-ECP, N309EA, NF309, NF309EA, NJ309, NJ309-ECP, NJ309EA, NJG309-VH, NU309, NU309-NTN, NU309EA, NUP309, NUP309-ECP, NUP309EA, QJ-309-MA, QJ-309-N2MA, QJ-309-N2PHAS, QJ-309-PHAS, QJ309.

Frequently asked questions

Are all 45×100×25 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 45 mm bore, 100 mm OD, 25 mm width (1.772×3.937×0.984 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 52 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 45×100×25?

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 45×100×25 mm in inches?

45×100×25 mm converts to 1.772×3.937×0.984 in, with a 27.5 mm (1.083 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 1309, 1309-EKTN9, 1309-ETN9 mount in the same space despite different internal designs.