MPNbase

20×52×66 mm bearings

11 models from 2 brands across 2 types share this ISO 15 envelope: 20 mm bore, 52 mm outside diameter, 66 mm width (0.787×2.047×2.598 in), 16 mm radial section.

11 models fit this space 2 brands 11 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)
KR-52-PPA Cam Followers SKF open CN 15.7 27 450
KR52-PP Cam Followers FAG 2RS CN 16.6 29.5 454
KRE52-PP Cam Followers FAG 2RS CN 16.6 29.5 473
KRV-52-PPA Cam Followers SKF open CN 20.9 46.5 460
KRV52-PP Cam Followers FAG 2RS CN 22.3 48.5 463
NUKR-52-A Cam Followers SKF open CN 29.7 36 450
NUKR52 Support Rollers FAG open CN 29.5 41.5 450
NUKRE52 Support Rollers FAG open CN 29.5 41.5 470
PWKR-52-2RS Cam Followers SKF open CN 23.8 26.5 450
PWKR52-2RS-XL Support Rollers FAG 2RS CN 25.5 33.5 450
PWKRE52-2RS-XL Support Rollers FAG 2RS CN 25.5 33.5 470

Note: catalogue dynamic load ratings for this envelope span 15.7– 29.7 kN — a 89% spread between designs in the very same 20×52×66 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 20 mm bore bearings for wider or narrower sections, or open a model page for naming-rule decode, applications and graded cross references: KR-52-PPA, KR52-PP, KRE52-PP, KRV-52-PPA, KRV52-PP, NUKR-52-A, NUKR52, NUKRE52, PWKR-52-2RS, PWKR52-2RS-XL, PWKRE52-2RS-XL.

Frequently asked questions

Are all 20×52×66 mm bearings interchangeable?

They share the same ISO 15 boundary dimensions — 20 mm bore, 52 mm OD, 66 mm width (0.787×2.047×2.598 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 11 models listed here and must be checked against the duty before substitution.

Is it a drop-in replacement if two bearings both measure 20×52×66?

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 20×52×66 mm in inches?

20×52×66 mm converts to 0.787×2.047×2.598 in, with a 16 mm (0.630 in) radial section height. These are the ISO 15 general-plan envelope dimensions shared across manufacturers, which is why models such as KR-52-PPA, KR52-PP, KRE52-PP mount in the same space despite different internal designs.