This NACHI bearing measures 12x28x8 mm and weighs 0.02 kg; the specification table carries the supplementary technical details. With no rubbing sealing lip, the running noise of this version is governed by the residual clearance and by the lubricant — and a narrowed tolerance turns that into a result comparable from piece to piece. Normal radial clearance with narrowed tolerances does not shift the range in which the clearance lies but reduces the permitted scatter within that range.
For the combination with shields on both sides this makes a fitting pair, because both features aim at the same property: predictable running and noise behaviour. Since the shields do not touch the rings, the contribution of a sealing lip to frictional torque and noise falls away entirely, so that the remaining influencing quantities are the residual clearance, the grease charge and the surface quality of the raceways.
Of these the residual clearance is the one open to design influence: a wider clearance lets the outer ring move further relative to the inner ring under changing load and stands out in vibration measurements and in radiated noise, while a tighter clearance raises radial stiffness but works towards preload once the interference fit and the warming have taken their share.
The narrowed tolerance reduces the band within which this result establishes itself across a production series and makes a noise or vibration acceptance reproducible; it does not, however, replace the correct choice of class, since fit and temperature gradient still consume the same share as under the undivided normal clearance. The grease charge is enclosed by the shields and dimensioned for the service life; in noise-critical applications its quantity and consistency belong to the specification just as the clearance class does.
Through-hardened standard bearing steel supplies the hardness and dimensional accuracy on which a narrow distribution can rest at all.
ManufacturerNACHI
Bearing typeDeep-groove ball bearings
Bore d12 mm
Outer Ø D28 mm
Width B8 mm
Weight0.02 kg
Sealsshields on both sides
Clearancenormal radial internal clearance, narrowed range
Cagepressed steel cage
Materialstandard bearing steel
Tolerancetolerance class P0/PN (ABEC 1)
Bore typecylindrical bore
€3.14/ pc
incl. VAT, plus shipping · price drops with quantity
In stock
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QtyUnit priceDisc.
1 – 4€3.14—
5 – 9€3.05−3 %
10 – 24€2.98−5 %
25 – 49€2.89−8 %
50 – 99€2.83−10 %
4 more for −3% volume discount
From 100 pcs: price and lead time on request – subject to review.
Total (1 pc)€3.14
NACHI 6001 ZZENRCM Kugellager (12x28x8)
— 12 x 28 x 8 mm
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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.
