HCB71907-C-T-P4S-UL Precision Bearing
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Brand |
= |
SEMRI |
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Manufacturer Part Number |
= |
HCB71907-C-T-P4S-UL |
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Inside Diameter |
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35mm |
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Outside Diameter |
= |
55mm |
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Width |
= |
10mm |
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Contact Angle |
= |
15° |
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Precision Grade |
= |
P4S |
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Seals or Shields |
= |
None |
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Material |
= |
Hybrid Ceramic |
|
Clearance |
= |
CN = Standard Internal clearance |
|
Cage Type |
= |
T = Outerring Guided Phenolic Cage |
Here is the comprehensive English documentation for the HCB71907-C-T-P4S-ULspindle bearing, covering its technical specifications, nomenclature breakdown, and industrial applications.
Technical Specifications
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Inner Diameter (d): 35 mm
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Outer Diameter (D): 55 mm
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Width (B): 10 mm
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Dynamic Load Rating : 12.1 kN
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Static Load Rating : 6.8 kN
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Limiting Speed (Grease): 26,000 r/min
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Limiting Speed (Oil-Air): 40,000 r/min
Nomenclature & Part Number Breakdown
According to the FAG Super Precision Bearings standard, each segment of the designation defines a specific technical property [2]:
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HCB: Hybrid Ceramic Balls. The rolling elements are made of silicon nitride . They are 60% lighter and significantly harder than steel balls, reducing centrifugal forces and heat generation at high speeds.
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719: Ultra-Light ISO Dimension Series. It features a very slim cross-section, saving radial installation space and allowing for higher speeds than the 70 or 72 series.
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07: Bore Size Code. Calculated as inner diameter.
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C: 15° Contact Angle. Optimized for high-speed operation and high radial stiffness .
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T: Outer Ring Guided Window-Type Cage. Made of textile laminated phenolic resin, which is lightweight with low friction—the gold standard for high-speed spindle cages .
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P4S: FAG High-Precision Standard. The dimensional tolerances conform to ISO Class 4 (ABEC 7), while the running tolerances (like rotational runout) meet the stricter ISO Class 2 (ABEC 9) for extreme accuracy.
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UL: Universal Design for Single Mounting, Light Preload. The bearings are manufactured to be universally interchangeable . They can be mounted in any arrangement (O-arrangement/DB, X-arrangement/DF, or Tandem/DT) and are factory-set to a Lightpreload .
Industrial Application Scenarios
This hybrid ceramic super-precision bearing is engineered for demanding applications requiring ultra-high speeds, minimal heat generation, exceptional rigidity, and zero vibration.
1. CNC Machine Tools & Metal Cutting Spindles
This is the most common application. The thin cross-section of the 719 series combined with the low thermal expansion of ceramic balls makes it perfect for:
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High-Speed Machining (HSM) Centers: Used for milling aluminum and titanium alloys in aerospace and automotive industries.
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CNC Engraving and Milling Spindles: Ideal for high-speed precision mold-making.
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Precision Grinding Spindles: High rotational accuracy (P4S) ensures sub-micron surface finish quality.
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PCB (Printed Circuit Board) Drilling Spindles: Micro-drilling requires extreme rotational speeds often exceeding 30,000 RPM.
2. Motor Spindles & High-Speed Electric Motors
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Integrated Motor Spindles: Where the motor rotor is built directly into the spindle shaft. Ceramic balls act as an electrical insulator to prevent electrical pitting (arc erosion) caused by stray motor currents.
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High-Speed Servo Motors: For precision automation requiring rapid start-stop cycles and low rotational inertia.
3. Semiconductor & Optical Manufacturing
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Wafer Dicing and Grinding Machines: Requires absolute positioning accuracy and minimal thermal displacement to avoid damaging delicate silicon wafers.
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Laser Scanning Mirror Mechanisms: Demands ultra-smooth rotation with zero vibration to keep the optical path stable.
4. Vacuum & Aerospace Technology
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Turbomolecular Pumps: High-vacuum pumps used in semiconductor cleanrooms that spin at tens of thousands of RPM. Ceramic balls can run reliably in vacuum environments where traditional lubricants fail.
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Gyroscopes and Navigation Systems: Used in aviation and defense guidance systems for absolute stability and low frictional torque.
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