HCS71916-E-T-P4S-K5-UL

The HCS71916-E-T-P4S-K5-UL hybrid angular contact bearing combines silicon nitride (Si3N4) ceramic balls with vacuum-arc remelted steel races, engineered for CNC spindles and dental handpieces requiring speeds up to 45,000 rpm. The K5 preload minimizes axial play to 2-4 μm during thermal expansion in 5-axis machining centers.The "UL" suffix denotes Kluber Isoflex NBU15 grease pre-packaging, rated for 60°C base oil viscosity (15 cSt) to reduce friction losses by 40% compared to steel ball bearings at 30,000 rpm. Ceramic balls cut centrifugal forces by 60%, enabling DN values exceeding 1.8 million in high-frequency grinding spindles. A 25° contact angle balances axial rigidity (1,200 N/μm) and radial load capacity (3.8 kN dynamic), while the E-type reinforced cage design prevents ball skid during rapid deceleration in robotic tool changers.

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