The dynamic load rating of 9.4 kN characterises this bearing. The static load rating is 5 kN. Because the shield does not touch the rings, the permissible speed of this version lies close to that of the open form — the limit is set by the cage and the lubricant, not by the shield. The shield is a sheet-metal part fixed in the outer ring that reaches close to a shoulder of the inner ring without touching it.
The whole character of the version follows from this geometry: the remaining gap holds back coarse contamination and keeps the grease charge in the rolling chamber, yet generates neither an additional frictional torque nor a heat source, so that breakaway torque, no-load losses and permissible speed stay close to those of an open version.
The price lies in the selectivity: a gap lets water, vapour and fine dust through, and where the position is exposed to such media, either a contact version or an upstream seal in the design is to be provided. Since the shields are fixed in the outer ring, the grease charge is part of the delivered condition and is dimensioned for the service life; the life of that charge — rather than material fatigue — is frequently the limiting quantity at moderate load, and it depends directly on the operating temperature and the speed of the position.
Normal radial clearance is matched to one interference-fitted ring and a moderate temperature difference between inner and outer ring; because the shields do not touch the rings, they exert no influence on the clearance themselves. During mounting it has to be observed that the fitting force is introduced through the ring carrying the interference fit: a force routed through the outer ring, or a heavily compressed housing bore, can deform the shield in its seat and close the gap.
Through-hardened standard bearing steel sets the temperature and load frame within which the ratings listed in the catalogue apply. Metal shields on both sides — Dimensional/form-fit equivalent — verify suffix-level details for critical applications. Matching suffixes are also listed by SKF (2Z), FAG (2Z), NSK (ZZ), NTN (ZZ) and NACHI (ZZE).
ManufacturerZEN
Bearing typeDeep-groove ball bearings
Bore d20 mm
Outer Ø D42 mm
Width B12 mm
Dyn. load C9.4 kN
Stat. load C₀5 kN
Limiting speed24,000 min⁻¹
Reference speed38,000 min⁻¹
Weight0.068 kg
Sealsshields on both sides
Clearancenormal radial internal clearance
Cagepressed steel cage
Materialstandard bearing steel
Tolerancetolerance class P0/PN (ABEC 1)
Shaft shoulder dₐ23.2–27.2 mm
Housing shoulder Dₐ34.8–38.8 mm
Bore typecylindrical bore
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ZEN 6004-2Z Kugellager (20x42x12)
— 20 x 42 x 12 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.
