MPNbase

35×80×21 mm bearings

46 models from 4 brands across 5 types share this ISO 15 envelope: 35 mm bore, 80 mm outside diameter, 21 mm width (1.378×3.150×0.827 in), 22.5 mm radial section.

46 models fit this space 4 brands 46 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)
1307 Self-Aligning Ball NTN open — 25.3 7.85 520
1307-EKTN9 Self-Aligning Ball SKF open CN 26.5 8.5 510
1307-ETN9 Self-Aligning Ball SKF open CN 26.5 8.5 510
1307K Self-Aligning Ball NTN open — 25.3 7.85 520
1726307-2RS1 Insert (Y-bearings) SKF 2RS CN 33.2 19 440
307 Deep Groove Ball SKF open CN 34.7 26.5 480
307-ZZ Deep Groove Ball SKF ZZ CN 34.7 26.5 480
6307 Deep Groove Ball SKF open CN 35.1 19 460
6307-2RS Deep Groove Ball SKF 2RS CN 35.1 19 460
6307-2RS-FAG Deep Groove Ball FAG 2RS CN 37 19.1 490
6307-2RS-NSK Deep Groove Ball NSK 2RS CN 36.5 19.2 464
6307-2RS-NTN Deep Groove Ball NTN 2RS CN 37 19.1 457
6307-FAG Deep Groove Ball FAG open CN 37 19.1 471
6307-M Deep Groove Ball SKF open CN 35.1 19 540
6307-NSK Deep Groove Ball NSK open CN 36.5 19.2 464
6307-NTN Deep Groove Ball NTN open CN 37 19.1 457
6307-RSR Deep Groove Ball NSK RSR CN 36.5 19.2 464
6307-RSR-NTN Deep Groove Ball NTN RSR CN 37 19.1 457
6307-ZZ Deep Groove Ball SKF ZZ CN 35.1 19 480
6307-ZZ-FAG Deep Groove Ball FAG ZZ CN 37 19.1 488
6307-ZZ-NSK Deep Groove Ball NSK ZZ CN 36.5 19.2 464
6307-ZZ-NTN Deep Groove Ball NTN ZZ CN 37 19.1 457
7307 Angular Contact Ball SKF open CN 39 24.5 450
7307-ACCBM Angular Contact Ball SKF open CN 46.5 30 450
7307-BE-2RZP Angular Contact Ball SKF RSR CN 39 24.5 450
7307-BECBM Angular Contact Ball SKF open CN 41.5 26.5 450
7307-BECBP Angular Contact Ball SKF open CN 41.5 26.5 450
7307-BECBY Angular Contact Ball SKF open CN 41.5 26.5 450
7307-BEGAPH Angular Contact Ball SKF open CN 41.5 26.5 450
7307-BEP Angular Contact Ball SKF open CN 39 24.5 450
7307-NTN Angular Contact Ball NTN open CN 44 26.3 462
7307B Angular Contact Ball NTN open CN 40.5 24.2 469
N307-ECP Cylindrical Roller SKF open CN 75 63 480
N307EA Cylindrical Roller NTN open CN 83.5 71 483
NF307EA Cylindrical Roller NTN open CN 83.5 71 483
NJ307-ECP Cylindrical Roller SKF open CN 75 63 490
NJ307EA Cylindrical Roller NTN open CN 83.5 71 483
NU307 Cylindrical Roller SKF open CN 75 63 470
NU307EA Cylindrical Roller NTN open CN 83.5 71 483
NUP307-ECP Cylindrical Roller SKF open CN 75 63 490
NUP307EA Cylindrical Roller NTN open CN 83.5 71 483
QJ-307-MA Angular Contact Ball SKF open CN 64 51 570
QJ-307-N2MA Angular Contact Ball SKF open CN 64 51 570
QJ-307-N2PHAS Angular Contact Ball SKF open CN 64 51 570
QJ307 Angular Contact Ball NTN open CN 55 73 570
W6307-2RS Deep Groove Ball SKF 2RS CN 28.6 19 441

Note: catalogue dynamic load ratings for this envelope span 25.3– 83.5 kN — a 230% spread between designs in the very same 35×80×21 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 35 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 1307, 1307-EKTN9, 1307-ETN9, 1307K, 1726307-2RS1, 307, 307-ZZ, 6307, 6307-2RS, 6307-2RS-FAG, 6307-2RS-NSK, 6307-2RS-NTN, 6307-FAG, 6307-M, 6307-NSK, 6307-NTN, 6307-RSR, 6307-RSR-NTN, 6307-ZZ, 6307-ZZ-FAG, 6307-ZZ-NSK, 6307-ZZ-NTN, 7307, 7307-ACCBM, 7307-BE-2RZP, 7307-BECBM, 7307-BECBP, 7307-BECBY, 7307-BEGAPH, 7307-BEP, 7307-NTN, 7307B, N307-ECP, N307EA, NF307EA, NJ307-ECP, NJ307EA, NU307, NU307EA, NUP307-ECP, NUP307EA, QJ-307-MA, QJ-307-N2MA, QJ-307-N2PHAS, QJ307, W6307-2RS.

Frequently asked questions

Are all 35×80×21 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 35 mm bore, 80 mm OD, 21 mm width (1.378×3.150×0.827 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 46 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 35×80×21?

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 35×80×21 mm in inches?

35×80×21 mm converts to 1.378×3.150×0.827 in, with a 22.5 mm (0.886 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as 1307, 1307-EKTN9, 1307-ETN9 mount in the same space despite different internal designs.