Semri B7220-E-2RSD-T-P4S-DUL Bearing_Ball Bearing,Roller Bearing,Pillow Block Bearing

B7220-E-2RSD-T-P4S-DUL Spindle Bearing
SEMRI B7220-E-2RSD-T-P4S-DUL Spindle Bearing

Brand	=	SEMRI
Manufacturer Part Number	=	B7220-E-2RSD-T-P4S-DUL
Inside Diameter（d）	=	100mm
Outside Diameter（D）	=	180mm
Width（B）	=	34mm
Combined Width (2B)	=	68mm
Contact Angle (a)	=	25°
Precision Grade	=	P4S
Seals or Shields	=	Non Contact Seals
Clearance	=	CN = Standard Internal clearance
Cage Type	=	T = Outerring Guided Phenolic Cage

Key application areas and specific equipment scenarios are as follows:
1. CNC Machine Tools and Metalworking Equipment (Primary Application)
This is the model's most significant application scenario. Modern machine tools require extremely high rotational precision and vibration resistance during cutting operations.
CNC Machine Tool Spindles: Used for spindle support in precision cutting machines, lathes, and milling machines, ensuring that the tool or workpiece does not deviate during high-speed rotation.
High-Speed Motorized Spindles: Equipped with 2RSD seals (double-sided non-contact rubber seals), these bearings effectively prevent external cutting fluids, metal chips, and dust from entering the bearing interior, making them ideal for integrated motorized spindles.
Grinding Spindles: Grinding operations generate significant amounts of dust and grinding fluid; the bearing's superior sealing performance can substantially extend the service life of the grinding spindle.

2. Electronics and Semiconductor Manufacturing Equipment
Semiconductor and electronics processing require absolute cleanliness and high machining precision.
PCB Drilling Machine Spindles: Micro-hole drilling in printed circuit boards (PCBs) involves extremely high speeds; these bearings (25° contact angle, E-type) are designed for ultra-high rotational speeds to meet the demands of high-frequency drilling.
Wafer Dicing Machines: During silicon wafer dicing, bearings require exceptional rotational precision (P4S tolerance class ensures minimal runout) to prevent wafer breakage.
3. Woodworking and Light Industrial Machinery
High-speed Woodworking Engraving/Milling Machines: Woodworking environments are filled with high concentrations of wood chips and dust. Standard open bearings are prone to jamming from debris, whereas this model features 2RSD seals combined with premium factory-applied grease, ensuring maintenance-free, long-life operation.
High-speed Glass Cutting and Engraving Machines: Effectively blocks fine glass particles from causing wear on the bearing's rolling elements.
4. Precision Instruments and High-speed Drive Systems
High-speed Turbomachinery / Centrifuges: Includes high-speed centrifuges and laboratory stirrers used in medical or laboratory settings.
Precision Inspection Equipment: Includes industrial-grade Coordinate Measuring Machines (CMMs), optical focusing rotary stages, and other systems requiring rotary axes with extremely high mechanical positioning precision.

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