MPNbase

40×80×18 mm bearings

54 models from 4 brands across 6 types share this ISO 15 envelope: 40 mm bore, 80 mm outside diameter, 18 mm width (1.575×3.150×0.709 in), 20 mm radial section.

54 models fit this space 4 brands 54 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)
11208-TN9 Self-Aligning Ball SKF open CN 19 6.55 720
1208 Self-Aligning Ball NTN open — 19.3 6.5 420
1208-EKTN9 Self-Aligning Ball SKF open CN 19.9 6.95 420
1208-ETN9 Self-Aligning Ball SKF open CN 19.9 6.95 420
1208K Self-Aligning Ball NTN open — 19.3 6.5 420
1726208-2RS1 Insert (Y-bearings) SKF 2RS CN 30.7 19 350
208 Deep Groove Ball SKF open CN 33.6 27 390
208-ZZ Deep Groove Ball SKF ZZ CN 33.6 27 390
6208 Deep Groove Ball SKF open CN 32.5 19 370
6208-2RS Deep Groove Ball SKF 2RS CN 32.5 19 370
6208-2RS-FAG Deep Groove Ball FAG 2RS CN 31.5 17.8 365
6208-2RS-NSK Deep Groove Ball NSK 2RS CN 32 17.9 366
6208-2RS-NTN Deep Groove Ball NTN 2RS CN 32.5 17.8 366
6208-FAG Deep Groove Ball FAG open CN 31.5 17.8 347
6208-NSK Deep Groove Ball NSK open CN 32 17.9 366
6208-NTN Deep Groove Ball NTN open CN 32.5 17.8 366
6208-RSR Deep Groove Ball SKF RSR CN 32.5 19 380
6208-RSR-NSK Deep Groove Ball NSK RSR CN 32 17.9 366
6208-RSR-NTN Deep Groove Ball NTN RSR CN 32.5 17.8 366
6208-ZZ Deep Groove Ball SKF ZZ CN 32.5 19 380
6208-ZZ-FAG Deep Groove Ball FAG ZZ CN 31.5 17.8 362
6208-ZZ-NSK Deep Groove Ball NSK ZZ CN 32 17.9 366
6208-ZZ-NTN Deep Groove Ball NTN ZZ CN 32.5 17.8 366
7208 Angular Contact Ball SKF open CN 34.5 24 370
7208-ACCBM Angular Contact Ball SKF open CN 41.5 29 370
7208-BE-2RZP Angular Contact Ball SKF RSR CN 34.5 24 420
7208-BECBM Angular Contact Ball SKF open CN 36.5 26 370
7208-BECBP Angular Contact Ball SKF open CN 36.5 26 370
7208-BECBPH Angular Contact Ball SKF open CN 36.5 26 370
7208-BECBY Angular Contact Ball SKF open CN 39 28 370
7208-BEP Angular Contact Ball SKF open CN 34.5 24 370
7208-NTN Angular Contact Ball NTN open CN 39 25.1 355
7208B Angular Contact Ball NTN open CN 35.5 23 375
BMB-6208-080S2-UB008A Sensor Bearing Units SKF — — 30.7 19 450
BMB-6208-080S2-UB108A Sensor Bearing Units SKF — — 30.7 19 460
N208 Cylindrical Roller NTN open CN 48.5 43 370
N208-ECP Cylindrical Roller SKF open CN 62 53 370
N208EA Cylindrical Roller NTN open CN 66 55.5 365
NF208 Cylindrical Roller NTN open CN 48.5 43 370
NF208EA Cylindrical Roller NTN open CN 66 55.5 365
NJ208 Cylindrical Roller NTN open CN 48.5 43 370
NJ208-ECP Cylindrical Roller SKF open CN 62 53 380
NJ208EA Cylindrical Roller NTN open CN 66 55.5 365
NU208 Cylindrical Roller SKF open CN 62 53 370
NU208-NTN Cylindrical Roller NTN open CN 48.5 43 370
NU208EA Cylindrical Roller NTN open CN 66 55.5 365
NUP208 Cylindrical Roller NTN open CN 48.5 43 370
NUP208-ECP Cylindrical Roller SKF open CN 62 53 390
NUP208EA Cylindrical Roller NTN open CN 66 55.5 365
QJ-208-MA Angular Contact Ball SKF open CN 56 49 450
QJ208 Angular Contact Ball NTN open CN 49 70.5 450
W6208 Deep Groove Ball SKF open CN 25.1 17.6 342
W6208-2RS Deep Groove Ball SKF 2RS CN 25.1 17.6 359
W6208-ZZ Deep Groove Ball SKF ZZ CN 25.1 17.6 359

Note: catalogue dynamic load ratings for this envelope span 19.0– 66.0 kN — a 247% spread between designs in the very same 40×80×18 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 40 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: 11208-TN9, 1208, 1208-EKTN9, 1208-ETN9, 1208K, 1726208-2RS1, 208, 208-ZZ, 6208, 6208-2RS, 6208-2RS-FAG, 6208-2RS-NSK, 6208-2RS-NTN, 6208-FAG, 6208-NSK, 6208-NTN, 6208-RSR, 6208-RSR-NSK, 6208-RSR-NTN, 6208-ZZ, 6208-ZZ-FAG, 6208-ZZ-NSK, 6208-ZZ-NTN, 7208, 7208-ACCBM, 7208-BE-2RZP, 7208-BECBM, 7208-BECBP, 7208-BECBPH, 7208-BECBY, 7208-BEP, 7208-NTN, 7208B, BMB-6208-080S2-UB008A, BMB-6208-080S2-UB108A, N208, N208-ECP, N208EA, NF208, NF208EA, NJ208, NJ208-ECP, NJ208EA, NU208, NU208-NTN, NU208EA, NUP208, NUP208-ECP, NUP208EA, QJ-208-MA, QJ208, W6208, W6208-2RS, W6208-ZZ.

Frequently asked questions

Are all 40×80×18 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 40 mm bore, 80 mm OD, 18 mm width (1.575×3.150×0.709 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 54 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 40×80×18?

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 40×80×18 mm in inches?

40×80×18 mm converts to 1.575×3.150×0.709 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 11208-TN9, 1208, 1208-EKTN9 mount in the same space despite different internal designs.