The mounting dimensions are 25x52x15 mm and the weight is 0.13 kg; technical details beyond these are shown in the specification table. With no bearing lip, the only remaining causes of the frictional torque are the grease charge and the load distribution in the rolling contact — and the load distribution depends on the residual clearance.
In this version the two features complement one another in a way that shows up in the frictional torque. The non-contact seal follows the contour of the inner ring with an elastomeric sealing body down to a narrow distance without touching it; this removes the contribution that dominates breakaway and no-load torque in a contact version — and removes its scatter with it, since a lip is subject to manufacturing tolerances of its contact pressure and to a wear that changes over the operating period.
What then remains are the grease charge and the load distribution in the rolling contact, and the load distribution is a direct consequence of the residual clearance: it determines how many balls carry at the same time and how the outer ring settles relative to the inner ring under load. Normal radial clearance with narrowed tolerances reduces the scatter of that quantity within the normal class without shifting the range, so that no-load torque, radial stiffness and vibration behaviour lie closer together across a production series.
Applications in which this counts check those values on the finished product and can no longer adjust them after joining. The choice of class is not replaced by it: interference fit and temperature gradient still consume the same share as under the undivided normal clearance, and where that share is large, a wider class remains the applicable answer.
The gap of the seal does not permanently hold back liquid and very fine dust; the grease charge is enclosed and dimensioned for the service life. Through-hardened standard bearing steel supplies the hardness and dimensional accuracy on which a narrow distribution can rest.
ManufacturerNACHI
Bearing typeDeep-groove ball bearings
Bore d25 mm
Outer Ø D52 mm
Width B15 mm
Dyn. load C14 kN(Catalogue value, not verified)
Stat. load C₀7.9 kN(Catalogue value, not verified)
Reference speed13,000 min⁻¹(Catalogue value, not verified)
Weight0.13 kg
Sealsnon-contact seals on both sides
Clearancenormal radial internal clearance, narrowed range
Cagepressed steel cage
Materialstandard bearing steel
Tolerancetolerance class P0/PN (ABEC 1)
Bore typecylindrical bore
€4.99/ pc
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Total (1 pc)€4.99
NACHI 6205-2NKE9CM Kugellager (25x52x15)
— 25 x 52 x 15 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.
