The mounting dimensions are 20x52x15 mm and the weight is 0.145 kg; technical details beyond these are shown in the specification table. This variant features stainless steel. Shield and material divide the task here: the gap holds back what can be held back, and the stainless steel bears what reaches it nonetheless. This version combines two protective effects that work on different levels.
The shields on both sides close the rolling chamber across a non-contacting gap, keep the grease charge in the bearing and coarse contamination out without contributing a frictional torque; they are, however, no barrier against liquid, and in a flushed environment it must be expected that cleaning agents and water will reach the rolling chamber.
What counts after that is the material: stainless steel forms a passive layer that slows the attack on raceway and balls, and thereby takes on the share of protection that the geometry cannot provide. The alternation of operating states deserves particular attention, because a cleaning cycle warms the position and cools it again: the air enclosed in the closed rolling chamber contracts, and the resulting negative pressure draws liquid inwards through the gap, where it comes into contact with the grease charge.
The grease charge is enclosed by the shields and dimensioned for the service life, so relubrication is not foreseen; its resistance to the cleaning agents in use and its suitability for the respective industry are to be checked separately. The material choice has a mechanical cost: the attainable hardness lies below that of a through-hardened bearing steel, which is why the load ratings listed in the catalogue come out lower and a position under the same load has to be assessed accordingly.
Normal radial clearance is matched to one interference-fitted ring and a moderate temperature difference; the differing thermal expansion of the stainless material is to be taken into account when selecting the fits. 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 D52 mm
Width B15 mm
Dyn. load C13.5 kN(Catalogue value, not verified)
Stat. load C₀7.65 kN(Catalogue value, not verified)
Limiting speed15,000 min⁻¹(Catalogue value, not verified)
Reference speed30,000 min⁻¹(Catalogue value, not verified)
Weight0.145 kg
Sealsshields on both sides
Clearancenormal radial internal clearance
Cagepressed steel cage
Materialstainless steel
Tolerancetolerance class P0/PN (ABEC 1)
Bore typecylindrical bore
€11.92/ 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€11.92—
5 – 9€11.57−3 %
10 – 24€11.33−5 %
25 – 49€10.97−8 %
50 – 99€10.73−10 %
4 more for −3% volume discount
From 100 pcs: price and lead time on request – subject to review.
Total (1 pc)€11.92
ZEN S6304-2Z Kugellager (20x52x15)
— 20 x 52 x 15 mm
Response within 4 business hours
✓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.
