B7228-E-2RSD-T-P4S-UL Spindle Bearing
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Brand |
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SEMRI |
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Manufacturer Part Number |
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B7228-E-2RSD-T-P4S-UL |
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Inside Diameter |
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140mm |
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Outside Diameter |
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250mm |
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Width |
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42m |
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Contact Angle |
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25° |
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Precision Grade |
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P4S |
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Seals or Shields |
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Laminated fabric cage |
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Clearance |
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CN = Standard Internal clearance |
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Cage Type |
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T = Outerring Guided Phenolic Cage
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The B7228-E-2RSD-T-P4S(including the universally matchable -UL variant) is a super-precision angular contact ball bearing. It is purpose-built for operating environments demanding extreme speed, high precision, and high rigidity.
Its core application is in CNC machine tool spindles, but it is also widely used across various high-speed, precision machinery.
1. CNC Machine Tools & Metal Cutting
This is the primary and most critical application field for this bearing model:
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Machine Tool Spindles: Serving as the support bearing for CNC milling machines, lathes, and machining centers to ensure stable, high-speed rotation of tools or workpieces.
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Motorized Spindles (Built-in Spindles): Acting as the high-demand support end where vibration and heat generation must be kept to an absolute minimum.
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Grinding Wheel & Headstock Spindles: Used in cylindrical and internal grinding machines where exceptional radial and axial runout precision (P4S rating) is non-negotiable.
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Precision Boring Heads: Applied in high-speed boring operations that require strict surface finish and tolerance standards.
2. High-Speed & Precision Processing Equipment
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Engraving & High-Gloss Milling Machines: Used in mold-engraving and high-gloss processing equipment for glass or smartphone casings, where the 2RSD dual-lip seals keep out fine dust while retaining grease.
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Woodworking Machinery: Integrated into the high-speed motorized spindles of CNC routers and edge-banding machines.
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PCB Drilling Machines: Supporting the ultra-high-speed drilling spindles used for making micro-holes in printed circuit boards.
3. Precision Instruments & Testing Equipment
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High-Precision Rotary Tables: Installed in precision indexing plates and rotary axes for automated manufacturing or optical inspection setups.
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Dynamic Balancing Machines: Supporting the core spindle component where minimal inherent vibration and superior rotational accuracy are critical for measurement precision.
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Optical Processing Equipment: Used in the main spindles of machines dedicated to grinding and polishing precision optical lenses.
4. Other High-Speed Fluid & Turbo Machinery
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High-Speed Turbochargers: Employed in lightweight, ultra-high-speed miniature turbo systems.
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Precision Vacuum Pumps: Utilized in high-vacuum devices like molecular pumps that run at extreme speeds and require tight control over lubricant vaporization.
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