The dynamic load rating of 31.7 kN characterises this bearing. The static load rating is 20.7 kN. The limiting speed is 11000 rpm. Point contact between ball and raceway keeps frictional torque low, which is why this type runs faster and cooler than any other rolling bearing. The deep, closely conforming raceway grooves in the inner and outer ring capture the balls positively, so the bearing takes radial load and moderate axial load in both directions without a second bearing position to oppose it.
Because the ball touches the raceway at a point, friction and heat stay low — the precondition for high speeds and for grease-for-life designs. The limits follow from that same geometry: the small contact area caps load capacity against a roller bearing of equal size, and the bearing tolerates misalignment within narrow limits only, since angular error transfers straight into the raceway grooves.
Seats in shaft and housing must therefore be aligned and geometrically accurate; where shaft deflection is expected, a self-aligning type belongs in that position. The open version leaves sealing, initial filling and relubrication to the surrounding design, while keeping the rolling chamber accessible for a directed supply of lubricant. Rings and rolling elements are made of through-hardened standard bearing steel.
ManufacturerNKE
Bearing typeDeep-groove ball bearings
Bore d45 mm
Outer Ø D85 mm
Width B19 mm
Dyn. load C31.7 kN
Stat. load C₀20.7 kN
Fatigue limit Pu0.9 kN
Limiting speed11,000 min⁻¹
Reference speed8,700 min⁻¹
Weight0.4 kg
Sealsnone (open bearing)
Materialstandard bearing steel
Tolerancetolerance class P0/PN (ABEC 1)
Shaft shoulder dₐ52–57.6 mm
Housing shoulder Dₐ72.4–78 mm
Bore typecylindrical bore
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NKE 6209-N Kugellager (45x85x19)
— 45 x 85 x 19 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.
