B7017-E-2RSD-T-P4S Angular Contact Ball Bearing_Ball Bearing,Roller Bearing,Pillow Block Bearing

B7017-E-2RSD-T-P4S Angular Contact Ball Bearing
SEMRI B7017-E-2RSD Precision Bearing

Brand	=	Semri
Manufacturer Part Number	=	B7017-E-2RSD-T-P4S
Inside Diameter	=	85mm
Outside Diameter	=	130mm
Width	=	22mm
Contact Angle	=	25°
Precision Grade	=	P4S
Seals or Shields	=	Non Contact Seals
Clearance	=	CN = Standard Internal clearance
Cage Type	=	T = Outerring Guided Phenolic Cage

B7017-E-2RSD-T-P4S is primarily used in cutting-edge industrial equipment that demands exceptional precision, rigidity, and smooth operation. Key application areas include:

1. Machine Tool Spindle Systems (Primary Application): This is the most common use case for this model. Thanks to its ISO Class 2 rotational accuracy and minimal frictional heat generation, it is used in: CNC milling machine and machining center spindles (minimizing radial and axial runout of cutting tools at high speeds to improve workpiece surface finish); precision cutting and engraving machine spindles (providing high-precision path control for mold making and 3C electronic casing manufacturing); high-speed internal/external grinding machine spindles (meeting strict vibration requirements to prevent chatter marks caused by the grinding wheel); and CNC lathe spindles (capable of withstanding combined cutting loads, especially when installed in pairs or sets, such as back-to-back or face-to-face configurations).

2. Precision Instruments and Measuring Equipment: Coordinate Measuring Machines (CMMs)—used in rotary tables or probe drive systems to ensure micron-level positioning accuracy; and precision optical inspection equipment—providing extremely smooth, vibration-free rotational support for the rotary axes of semiconductor and wafer inspection instruments.

3. Semiconductor and Electronic Manufacturing Equipment: Electronic chip mounters (where placement heads require high-frequency, high-speed, and precise start-stop and rotational movements); and PCB CNC drilling machines (where the spindle operates at extremely high speeds, and the bearing's lightweight cage [T] and seal design [2RSD] perfectly handle high speeds while blocking glass fiber dust).

4. High-Speed Power and Transmission Systems: High-speed precision speed reducers—such as the input stages of harmonic drives or RV reducers used in robot joints. Turbochargers and high-speed blowers: High-speed support ends of certain precision industrial turbomachinery or gas compressors.
A detailed breakdown of application scopes and scenarios follows:
1. Miniature CNC Machine Tools & Ultra-High-Speed Spindles: When machining miniature parts—where tool diameters are often just a fraction of a millimeter—extremely high speeds of 30,000 to 45,000 RPM are essential to maintain the required cutting speed. High-precision miniature mold engraving spindles: Used for mirror-finish cutting of smartphone mid-frames, precision watch gears, and semiconductor carbide micro-molds; a 25° contact angle (E) ensures superior radial rigidity against oscillation. Lightweight dental milling spindles (digital dentistry): Used for the rapid milling of zirconia ceramic, resin, and titanium alloy prosthetics. High-frequency electric spindles and micro-milling heads: Industrial-grade, high-speed miniature drive spindles designed for extremely confined spaces.
2. Humanoid Robot Joints & Precision Actuators: In the cutting-edge field of humanoid robotics, these bearings provide indispensable support within compact spaces: Frameless brushless motor support: Supporting the rotors of frameless motors integrated into humanoid robot arm joints (e.g., wrists, elbows), these bearings require a minimal footprint, ultra-light weight (only 38g per unit), and high-precision rotation. Linear actuator servo support: Supporting the high-frequency reciprocating rotation of miniature planetary roller screws or ball screws in robotic leg or arm linear actuators; P4S-grade rotational precision ensures micron-level repeatability.
3. Electronics, Semiconductor & Micro-Automation: Semiconductor and electronics manufacturing equipment demands "high dynamic response, oil-free operation, and maintenance-free performance": High-speed rotating nozzles for semiconductor pick-and-place machines: Enabling rapid pickup and rotational alignment of micro-chips, these bearings feature ultra-low rotational inertia to meet the demands of frequent, instantaneous start-stop cycles (rapid acceleration and deceleration). High-speed PCB (Printed Circuit Board) precision drilling machines: Support continuous, high-speed operation with ultra-small drill bits (e.g., 0.1mm); 2RSD seals prevent epoxy resin dust and glass fiber debris from entering the raceway. Precision rotary stages for wafer dicing and inspection: Deliver nanometer-level trajectory repeatability during silicon wafer dicing and optical inspection.

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