7001 / 7001C 2RZ HQ1 P4 Sealed Angular Contact Ball Bearing — 12 x 28 x 8 mm One piece, ABEC7 grade, with SI3N4 ceramic balls Key benefits - Precision and repeatability: P4 tolerance and ABEC7 grading deliver tight dimensional accuracy and consistent rotation for spindle applications. - High-speed performance: SI3N4 ceramic balls reduce friction and heat generation, improving stability at higher RPM compared with all-steel designs. - Contamination protection: 2RZ double-sided seals keep dust and coolant out to extend service life and reduce maintenance. - Support for combined loads: Angular contact design handles axial and radial loads typical in spindles and rotating tools. - Compact fit: Standard 12 x 28 x 8 mm dimensions for direct replacement where this size and series are specified. Features and specifications - Models/identifiers: 7001, 7001C, 2RZ, HQ1, P4 - Size: 12 mm bore x 28 mm outer diameter x 8 mm width - Bearing type: Sealed angular contact ball bearing for spindle use - Balls: SI3N4 ceramic balls for improved wear resistance and lower thermal expansion - Grade/tolerance: ABEC7, P4 (precision class) - Seal: 2RZ (both sides sealed) - Quantity: single unit Why customers choose this bearing - Ideal when you need a precision spindle bearing with ceramic ball advantages (lower friction, better thermal behavior) and contamination protection from seals. - Suitable for repairs or upgrades where improved high-speed stability and reduced maintenance intervals are required. - Retains the exact dimensions and designation for compatibility with equipment specified for 7001 / 7001C series bearings. Typical use scenarios - CNC router or milling spindle: replaces a standard 7001-series bearing to improve runout control and thermal stability at high RPM. - High-speed electric motors and spindles in small machine tools: supports combined radial and axial loads while minimizing friction and heat buildup. - Precision rotary assemblies such as small grinders, drills, or test benches where sealed protection and consistent precision (ABEC7 / P4) are required. Compatibility and fitment notes - Confirm the 12 x 28 x 8 mm dimensions and 7001-series designation match your existing bearing seat and shaft before installation. - Sealed 2RZ design is best for environments with moderate contamination or where re-lubrication is limited. One-piece supply: the listing is for a single 7001 7001C 2RZ HQ1 P4 12x28x8 sealed angular contact ball bearing with ABEC7 rating and SI3N4 ceramic balls.