At 20x42x12 mm and a unit weight of 0.069 kg, the installation envelope is fixed; further technical details are held in the specification table. An elastomeric sealing body can be brought closer to the ring geometry than a sheet-metal part; from this follows better retention at a practically unchanged frictional torque. The non-contact seal consists of an elastomeric sealing body on a sheet-metal insert, fixed in the outer ring, whose contour follows the shoulder or groove of the inner ring down to a narrow distance without touching it.
The difference from a shield lies less in the principle than in what can be realised: an elastomeric body can be moulded and guided more closely than a sheet-metal part, so the remaining passage cross-section comes out smaller and the grease charge is better retained in the rolling chamber. The difference from a contact version, by contrast, is fundamental: without contact pressure no load-independent frictional torque arises, no additional heat source at the inner ring and no wear point, which is why the permissible speed stays close to that of the open form and the barrier effect does not decline over the operating period through lip wear.
The limit of this version follows from the same geometry: a gap, however closely it may be guided, does not hold back liquid permanently, so for flushed or continuously wetted positions a contact version or an upstream seal in the design is to be provided. The grease charge is included in the delivered condition and dimensioned for the service life; its ageing at the actual operating temperature is frequently the limiting quantity at moderate load.
Normal radial clearance is matched to one interference-fitted ring and a moderate temperature difference between the rings, whereby the seal itself makes no contribution to the warming and therefore does not enter the consideration of the residual clearance. Through-hardened standard bearing steel sets the temperature and load frame of the rings; the temperature limit of the sealing material is to be taken from the designation.
ManufacturerNTN
Bearing typeDeep-groove ball bearings
Bore d20 mm
Outer Ø D42 mm
Width B12 mm
Dyn. load C10.4 kN(Catalogue value, not verified)
Stat. load C₀5.05 kN(Catalogue value, not verified)
Limiting speed21,000 min⁻¹(Catalogue value, not verified)
Reference speed18,000 min⁻¹(Catalogue value, not verified)
Weight0.069 kg
Sealsnon-contact seals on both sides
Clearancenormal radial internal clearance
Cagepressed steel cage
Materialstandard bearing steel
Tolerancetolerance class P0/PN (ABEC 1)
Bore typecylindrical bore
€6.13/ 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€6.13—
5 – 9€5.94−3 %
10 – 24€5.82−5 %
25 – 49€5.64−8 %
50 – 99€5.51−10 %
4 more for −3% volume discount
From 100 pcs: price and lead time on request – subject to review.
Total (1 pc)€6.13
NTN 6004 LLB/5K Kugellager (20x42x12)
— 20 x 42 x 12 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.
