The principal dimensions are 20x47x14 mm at a weight of 0.1 kg; the further technical details are listed in the specification table. Two things have to be fixed for this version in series production: the mounting direction of a directional component and the scatter of the clearance into which it is fitted. In this version a directional component and a more narrowly defined clearance meet, and in series production both features have to be managed.
The single shield consists of a sheet-metal part fixed in the outer ring that reaches close to a shoulder of the inner ring without touching it: the closed side holds back coarse ingress, the open side lets lubricant from the surrounding space reach the rolling contact and frictional heat leave with it. Because this bearing thereby has two different sides, its mounting direction belongs in the assembly documents; a reversed position inverts the direction of protection without this being noticeable during assembly.
Normal radial clearance with narrowed tolerances does not shift the clearance range but reduces the permitted scatter within the normal class, so that two bearings of the same designation lie closer together in the mounted state. That takes effect precisely where the residual clearance is not set on the individual unit but is fixed by fits and manufactured dimensions — on radial stiffness, vibration behaviour and the size of the load zone.
One advantage of this combination is that the non-contacting shield contributes neither a frictional torque nor a heat source and does not influence the clearance, so the narrower distribution arrives undamped in the running behaviour. The choice of class itself is not replaced by it: interference fit and temperature gradient still consume the same share as under the undivided normal clearance.
Through-hardened standard bearing steel supplies the hardness and dimensional accuracy on which a narrow distribution rests; sealing against liquid and fine dust remains the task of the surrounding design.
ManufacturerNACHI
Bearing typeDeep-groove ball bearings
Bore d20 mm
Outer Ø D47 mm
Width B14 mm
Dyn. load C12.8 kN(Catalogue value, not verified)
Stat. load C₀6.6 kN(Catalogue value, not verified)
Reference speed16,000 min⁻¹(Catalogue value, not verified)
Weight0.1 kg
Sealsshield on one side
Clearancenormal radial internal clearance, narrowed range
Cagepressed steel cage
Materialstandard bearing steel
Tolerancetolerance class P0/PN (ABEC 1)
Bore typecylindrical bore
€2.93/ pc
incl. VAT, plus shipping · price drops with quantity
In stock
Typically ready to ship in 1–2 days
In stock · ships via DPD, UPS or Deutsche Post
QtyUnit priceDisc.
1 – 4€2.93—
5 – 9€2.84−3 %
10 – 24€2.79−5 %
25 – 49€2.70−8 %
50 – 99€2.64−10 %
4 more for −3% volume discount
From 100 pcs: price and lead time on request – subject to review.
Total (1 pc)€2.93
NACHI 6204 ZECM Kugellager (20x47x14)
— 20 x 47 x 14 mm
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✓Free shipping over €100 · 14-day returns
✓Purchase on invoice – first order paid before dispatch, then 14-day terms for approved business customers
Same dimensions means the same bearing type and matching main dimensions (d × D × B). Sealing, cage, internal clearance and execution (e.g. material, precision, grease fill) are encoded in the suffix and may differ — please check before ordering. Equivalent additionally means the same sealing, internal clearance and tolerance class; the cage and other suffix features (e.g. lubrication groove) may differ.
