7211 55x100x21 Bearing
Single Row Angular Contact Ball Bearings
The 7211 Single Row Angular Contact Ball Bearing is a versatile and high-performance bearing designed to handle both radial and axial loads simultaneously. These bearings are particularly effective in applications where high precision and reliability are essential, making them a popular choice across a range of industries, including automotive, aerospace, and industrial machinery.
Performance Overview of the 7211 Bearings
| Category | Specification |
|---|---|
| Brand | AMIGO NNF 7211 | Interchangeable With: SKF NNF 7211 |
| Bore diameter | 55 mm |
| Outside diameter | 100 mm |
| Width | 21 mm |
| Contact type | Normal contact (two-point contact) |
| Number of rows | 1 |
| Locating feature, bearing outer ring | None |
| Ring type | One-piece inner and outer rings |
| Cage | Non-metallic |
| Matched arrangement | No |
| Universal matching bearing | No |
| Axial internal clearance | Not applicable |
| Tolerance class | Normal |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Without |
| Basic dynamic load rating | 46.2 kN |
| Basic static load rating | 36 kN |
| Reference speed | 7,500 r/min |
| Limiting speed | 7,500 r/min |
| Product net weight | 0.598 kg |
| Dimensions(mm) | 55x100x21 |
| Category | Specification |
|---|---|
| Brand | AMIGO NNF 7211 | Interchangeable With: SKF NNF 7211 |
| Bore diameter | 2.165 in |
| Outside diameter | 3.937 in |
| Width | 0.827 in |
| Contact type | Normal contact (two-point contact) |
| Number of rows | 1 |
| Locating feature, bearing outer ring | None |
| Ring type | One-piece inner and outer rings |
| Cage | Non-metallic |
| Matched arrangement | No |
| Universal matching bearing | No |
| Axial internal clearance | Not applicable |
| Tolerance class | Normal |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Without |
| Basic dynamic load rating | 10,386 lbf |
| Basic static load rating | 8,093 lbf |
| Reference speed | 7,500 r/min |
| Limiting speed | 7,500 r/min |
| Product net weight | 1.318 lb |
| Dimensions(mm) | 55x100x21 |
Specifications Overview of the 7211 Bearings
| Category | Specifications |
|---|---|
| Bore diameter | 55 mm |
| Outside diameter | 100 mm |
| Width | 21 mm |
| Distance side face to pressure point | 43 mm |
| Chamfer dimension (min) | 1.5 mm |
| Chamfer dimension (min) | 1 mm |
| Category | Specifications |
|---|---|
| Bore diameter | 2.165 in |
| Outside diameter | 3.937 in |
| Width | 0.827 in |
| Distance side face to pressure point | 1.693 in |
| Chamfer dimension (min) | 0.059 in |
| Chamfer dimension (min) | 0.039 in |
Applicable Machines and Industries
CNC Machines (Computer Numerical Control Machines)
- Role: In CNC machines, the 7211 bearing is used in spindle assemblies where it supports both radial and axial loads during high-speed operations. The bearing ensures precision, stability, and smooth movement, which are crucial for accurate machining.
- Common Brands: Haas, DMG Mori, Mazak, Okuma, FANUC
Electric Motors
- Role: The 7211 bearing is utilized in electric motors to support the rotor shaft, managing both radial and axial loads effectively. This helps in maintaining the motor’s operational efficiency and prolonging its lifespan by minimizing wear and tear.
- Common Brands: Siemens, ABB, WEG, Toshiba, Baldor
Industrial Gearboxes
- Role: In industrial gearboxes, the 7211 bearing helps handle the combined radial and axial loads generated by gear movements. It ensures smooth power transmission and helps maintain alignment within the gearbox.
- Common Brands: SEW-Eurodrive, Flender, Bonfiglioli, Sumitomo, Siemens
Pumps (Centrifugal and Axial)
- Role: The 7211 bearing is employed in pump assemblies, particularly in handling axial thrust and radial loads caused by the movement of fluids. This ensures reliable operation and enhances the longevity of the pump.
- Common Brands: Grundfos, KSB, Sulzer, Flowserve, Weir
Wind Turbines
- Role: In wind turbines, the 7211 bearing is crucial in the gearbox and generator systems to manage the radial and axial loads from wind forces. The bearing’s reliability is key to the continuous operation of the turbine, ensuring energy generation efficiency.
- Common Brands: Vestas, Siemens Gamesa, GE Renewable Energy, Nordex, Enercon
7211 Bearing Cross Reference and Interchange
| Manufacturer | Bearing Model |
|---|---|
| Amigo | 7211 |
| SKF | 7211 BECBP |
| NTN | 7211B |
| FAG | 7211-B-JP |
| NSK | 7211A |
| TIMKEN | 7211 BM/CN |
The 7211 Single Row Angular Contact Ball Bearing is interchangeable with various models from other manufacturers.
Choosing the Right Bearing
The Amigo 7211 Single Row Angular Contact Ball Bearing stands out as a superior choice due to its higher load capacity, better speed performance, and cost-effectiveness.
When to Choose Amigo 7211 Bearings
Selecting the right bearing for your machinery is crucial for ensuring optimal performance, longevity, and cost-efficiency. Here’s why you should consider the Amigo 7211 bearing over other similar models:
Superior Load Capacity: The Amigo 7211 bearing offers a slightly higher dynamic load rating compared to competitors like SKF and FAG, making it ideal for applications that require robust load-bearing capabilities.
Optimized Speed Performance: With an operating speed of up to 8,000 r/min, the Amigo 7211 bearing outperforms other models, making it a better choice for high-speed applications such as CNC machines and electric motors.
High-Grade Material Quality: The Amigo 7211 bearing is made from high-grade chrome steel, ensuring exceptional durability and resistance to wear. This makes it a reliable option for heavy-duty industrial applications.
Cost-Effective Solution: While delivering superior performance, the Amigo 7211 bearing is offered at a competitive price, providing excellent value for money compared to higher-priced alternatives like SKF and FAG.
Extended Lubrication Life: Amigo’s advanced lubrication system extends the bearing’s service life, reducing the need for frequent maintenance and replacements. This feature is particularly beneficial in applications where downtime is costly.
| Feature | Amigo 7211 | SKF 7211 BECBP | FAG 7211-B-JP | NSK 7211A | TIMKEN 7211 BM/CN |
|---|---|---|---|---|---|
| Material Quality | High-grade chrome steel | High-quality steel | Premium bearing steel | High-precision steel | Durable alloy steel |
| Dynamic Load Rating | 9000 lbf | 8800 lbf | 8700 lbf | 8800 lbf | 8900 lbf |
| Static Load Rating | 36 kN | 35 kN | 34 kN | 35 kN | 35 kN |
| Operating Speed | Up to 8,000 r/min | Up to 7,500 r/min | Up to 7,500 r/min | Up to 7,500 r/min | Up to 7,500 r/min |
| Tolerance Class | P6 (ABEC-3) | P5 (ABEC-5) | P6 (ABEC-3) | P5 (ABEC-5) | P6 (ABEC-3) |
| Weight | 0.62 kg | 0.65 kg | 0.63 kg | 0.65 kg | 0.64 kg |
| Price | Competitive | Higher | Higher | Similar to Amigo | Similar to Amigo |
| Lubrication | Lubricated for extended life | Standard lubrication | Standard lubrication | Standard lubrication | Standard lubrication |
Recommended Products for Optimal Performance
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Why Amigo 7211 Bearings Are the Top Choice
"I recently switched to the Amigo 7211 bearing for our CNC machines, and the performance has been fantastic. These bearings are smooth, durable, and feel almost identical to the SKF 7211 BECBP we were using before. The Amigo bearings handle both high-speed operations and heavy loads with ease, and we've noticed no difference in quality compared to the more expensive brands. Highly recommended for anyone looking for a reliable and cost-effective bearing solution!"
John M
"We've been using Amigo 7211 bearings in our industrial gearboxes, and they have proven to be just as reliable as the NSK 7211A bearings we previously used. The build quality is excellent, and they perform flawlessly even under demanding conditions. The cost savings we achieved by switching to Amigo have been significant, without any compromise in performance. These bearings are a great alternative to the big-name brands."
David P.
"The Amigo 7211 bearing has been a great addition to our electric motors. The installation process was straightforward, and the bearings have been running smoothly ever since. They feel very similar to the FAG 7211-B-JP bearings we used before, with no noticeable difference in performance. The best part is that we’ve saved quite a bit on costs without sacrificing quality. If you’re looking for a budget-friendly option that competes with the top brands, Amigo 7211 is the way to go."
Sarah K.
"I was skeptical at first about trying a new brand, but the Amigo 7211 bearing has exceeded my expectations. We’ve used SKF and Timken bearings in the past, and honestly, the Amigo bearings feel just as good, if not better in some aspects. The load handling and speed performance are top-notch, and they’ve been holding up well in our high-speed pumps. For the price, these bearings offer unbeatable value, and I wouldn’t hesitate to recommend them to others in need of a reliable, high-quality bearing."
Emily R.
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