7208 AC
Main technical Specifications
Detailed parameters and installation dimensions:
rs(min): 1.10 mm, r1s(min): 0.60 mm
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7208 AC refers to a type of Angular contact ball bearings, super-precision, with dimensions 40 mm (Bore) x 80 mm (OD) x 18 mm (Width), designed for High speed, ultra-precision, high rigidity, low operating friction, and long service life, primarily used in CNC machine tool spindles and other high-precision machinery, Its normal operating speed can reach: the grease speed ratings: 15000 rpm, oil speed ratings: 24000 rpm, for applications the field of precision machinery, especially high-speed and high-precision spindle systems, requiring high running accuracy and the accommodation of radial and axial loads simultaneously. it's built to handle significant loads (dynamic radial: 32500 N, static radial: 29500 N, ), It weight approximately 0.4 kilogram.
- Min. Order: 1 Piece/(7208 AC, 40 = ID, 80 = OD, 18 = B, 0.4 kg) or according to different suppliers
- Price: Different brands, different quality, different 7208 AC prices, different suppliers and different quality determine different prices, you can ask the supplier in detail for the price according to your own needs.
- Precision Rating: DIN: P2~P0; ANSI: ABEC9~ABEC1; JIS: JIS~JIS0; ISO: CLASS2~NORMAL CLASS; GB/T30794 B~G
- Inquiry ways: The right of the inquiry form, Email, skype, Whatsapp
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✨What are the Benefits of choosing 7208 AC bearings?
🏭 What are the applications of the 7208 AC bearing?
📐 How should choose the right model for a Angular contact ball bearings, super-precision?
Direction Selection
High-speed priority: Select small contact angles (15°/18°), such as SKF's E/B/A design or NSK's ROBUST series.
Heavy-duty/high-rigidity priority: Select large contact angles (25° and above), such as SKF's D design or NSK's TAC-F series.
Parameter Selection
Size series: Ultra-light 718, Extra-light 719, Light and narrow 70, Heavy-duty 72.
Internal design: Correspond to the high-speed or heavy-duty optimization code of each brand.
Material: Ceramic balls (hybrid ceramic bearings) can significantly improve high-speed performance.
Accuracy and Combination Selection
Accuracy: Machine tool spindles generally select ISO P4 grade (ABEC 7 grade) or higher.
Matching: DB (back-to-back) has good rigidity; DF (face-to-face) has good thermal conductivity; DT (tandem) can withstand unidirectional heavy loads.
Preload: Select light, medium, or heavy-duty according to the load; universal matching models are more convenient.
🛠️ What is the mounting procedure for 7208 AC bearings?
Cleaning and Inspection: Clean the bearing in a dust-free environment. After a rough wash to remove contaminants, perform a fine wash until the bearing feels smooth and responsive to the touch. Simultaneously check the accuracy of the mating surfaces of the shaft and bearing housing.
Measurement and Fitting: Precisely measure the bearing's inner and outer diameters. Mark the corresponding positions on the shaft and housing bores for alignment during assembly to compensate for any deviations.
Installation and Positioning: Apply pressure evenly using a specialized tool, focusing only on the interference fit rings. If heat fitting is used, tighten the inner ring during cooling to prevent clearance from affecting the preload.
Preload Adjustment: When installing in pairs, ensure the parallelism of the inner and outer spacers is ≤1μm. Adjust the preload force to the specified value by grinding the spacers.
Lubrication Inspection: Add the specified amount of grease or oil mist lubricant. After installation, manually rotate the bearing to check its flexibility and operating noise.
📋 Special Note for mounting 7208 AC bearings?
Clean Environment: Operation must be performed in a dust-free cleanroom with humidity ≤65% to prevent dust and impurities from affecting accuracy.
No Striking: Direct striking of the bearings is strictly prohibited. Special tools must be used, and force must be applied evenly.
Matching Marks: Bearings used in pairs are not interchangeable. Installation must strictly follow the factory matching marks.
Rust-Proof Storage: Long-term storage requires regular rust-proofing treatment. Maintain ventilation and avoid corrosive gases.