Stainless steel flange-mounted bearing with Si3N4 ceramic balls and Torlon cage. Ultra-high speed capability, corrosion resistance, maintenance?free design. Ideal for dental turbines, high-speed handpieces, precision instruments, and demanding miniature rotating applications. Key Specifications: Model: SFR144TLZN Bearing Type: Flanged deep groove ball bearing Inner Diameter (d): 3.175 mm (1/8 in) Outer Diameter (D): 6.35 mm (1/4 in) Width (B): 2.38 mm (3/32 in) Flange Outer Diameter (Df): 7.518 mm (0.296 in) Flange Width (Bf): 0.787 mm Precision Grade: P4 (ABEC-7) Maximum Rotational Speed: 500,000 RPM Ring Material: Stainless steel Ball Material: Silicon Nitride (Si3N4) ceramic