7211 Bearing

1.Product Introduction: The standard model of angular contact ball bearings (7211), with an inner diameter of 55mm and a contact angle of 25°, focusing on bearing axial loads, suitable for small and medium-sized precision equipment. 2.Structure Type: Inner ring + outer ring (with positioning groove for convenient installation) + single-row steel balls + stamped steel cage (conventional) / brass cage (customized). 3.Size Range: Inner diameter: 55mm, outer diameter: 100mm, width: 21mm. 4.Material: Inner ring / outer ring: GCr15, rolling elements (steel balls): GCr15, cage: stamped steel (conventional) / brass (precision customized). 5.Accuracy: Conventional P0 grade, precision models are of P6/P5/P4 grades. 6.Application Fields: Spindles of small machine tools, transmissions of light-duty truck automobiles, 5.5kW water pumps, generators, textile equipment. 7.Key Inspection Items: Outer diameter dimension accuracy (100 ± 0.008mm), contact angle (25° ± 1°), axial clearance (0.004 - 0.009mm), strength of the cage.

Product Description

7211 Bearing: Precision Engineered for Heavy-Duty Industrial Applications

The 7211 bearing is optimized for metallurgical, port, and medical equipment with ISO-certified manufacturing and rapid customization. Designed as a high-precision angular contact ball bearing, it supports both axial and radial forces while maintaining exceptional stability in severe operating environments.

Technical Specifications

Parameter Specification
Dimensions 55mm (ID) x 100mm (OD) x 21mm (Width)
Load Capacity Dynamic 61.8kN | Static 48.5kN load handling for ball bearing setups
Material & Hardness High-purity chromium steel with HRC 60-64 surface hardness for long-lasting bearing raceways
Precision & Sealing ABEC-7/P4 (ISO 492) precision; Triple-lip contact seals for IP6X dust/water resistance

Key Advantages

  • High-Temperature Stability: Stable bearing performance up to 150°C for metallurgical kilns and steel mills.
  • Ultra-Low Noise: Operates below 35dB, making this angular contact bearing ideal for medical imaging devices.
  • P4 Precision Grinding: Radial runout ≤0.0025mm ensures high reliability in fast port machinery spindles.

Industry Applications

  • Metallurgy: The 7211 bearing withstands 150°C furnace rollers, offering a 20% longer lifespan than standard bearings.
  • Port Cranes: Higher shock load capacity for grab ship unloaders in dusty or saltwater crane bearing setups.
  • Medical Scanners: FDA-compliant materials with low noise for MRI systems and precision medical robotics ball bearings.

Quality Assurance & Logistics

Every bearing batch undergoes raw material spectrometry, in-process tolerance checks (±0.001mm), and 12+ validation tests. Standard units ship in 48 hours, with 15–20 day delivery for custom variants.

FAQs

Q: Can your 7211 bearings handle continuous 150°C operations?
A: Yes. Our HT Series uses ceramic coatings and specialty alloys for high-temperature bearing stability.

Q: How do you customize 7211 bearings for high-speed port machinery?
A: We modify cage designs, use hybrid ceramic balls, and enhance seals for high-wear angular contact ball bearings.

Q: What tests ensure P4 precision for medical bearing use?
A: Each batch undergoes vibration analysis, noise testing, and ISO cleanliness checks for precision ball bearings.

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