Angular Contact Bearing HS71904-E-2RSD-T-P4S
|
Brand |
= |
SEMRI |
|---|---|---|
|
Manufacturer Part Number |
= |
HS71904-E-2RSD-T-P4S |
|
Inside Diameter（d） |
= |
20mm |
|
Outside Diameter（D） |
= |
37mm |
|
Width（B） |
= |
9mm |
|
CO |
= | CHINA |
|
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 |
Scope of Application
1. 3C Electronics and Semiconductor Manufacturing Equipment
In an era where electronic products are increasingly miniaturized, these bearings play a vital, "small yet powerful" role in semiconductor and microelectronics processing:
• Spindles for multi-head, high-speed PCB (printed circuit board) drilling machines: To boost efficiency, modern PCB drilling machines often feature dozens of micro-spindles arranged side-by-side. The ultra-slim outer diameter of these bearings (only 37 mm) enables a high-density, compact spindle configuration. Furthermore, as drill bits penetrate circuit boards at high speeds, they generate significant axial reaction forces; the "E" design (25° contact angle) provides exceptional vertical compressive rigidity, ensuring precise drilling without deviation or drill-bit breakage.
2. Precision CNC Machine Tools and Micro-Engraving Spindles
When processing specialized materials or complex, miniature components, this bearing serves as a critical support element for motorized spindles:
• Spindles for Graphite Engraving or Carbon Fiber Cutting: The machining of graphite and carbon fiber generates significant amounts of conductive dust—finer even than flour—which is the primary cause of failure for standard, open-type bearings. The 2RSD rubber seals on this bearing effectively block this fine particulate matter without compromising rotational speed, thereby preventing the internal grease from degrading or failing.
• Spindles for High-Precision Hardware and Watch Component Engraving: During the machining of watch cases or high-precision molds for lightweight metals, the spindle must withstand frequent lateral cutting forces. Compared to standard bearings that utilize smaller rolling elements, the HS (large-ball) design offers superior mechanical rigidity and vibration resistance. This significantly enhances the surface finish of the workpiece and eliminates chatter marks caused by the cutting process.
