NNU4924-S-K-M-SP 120x165x45 Bearing
Double Row Cylindrical Roller Bearings
The NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearing is a high-precision bearing designed for demanding applications. It has a bore diameter of 120 mm, an outside diameter of 165 mm, and a width of 45 mm. The bearing features a machined brass cage for enhanced durability and reduced friction. It is ideal for heavy radial loads and operates efficiently in industrial machinery like gearboxes and motors. With a super precision class of SP, it offers reliable performance, comparable to well-known brands like SKF and FAG, ensuring consistent results in various applications.
Performance Overview of the NNU4924-S-K-M-SP Bearings
| Category | Specification |
|---|---|
| Brand | AMIGO NNU4924-S-K-M-SP | Interchangeable With: SKF NNU4924-S-K-M-SP |
| Bore diameter | 120 mm |
| Outside diameter | 165 mm |
| Width | 45 mm |
| Bearing part | Complete bearing |
| Number of rows | 2 |
| Bore type | Tapered 1:12 |
| Cage | Machined metal |
| Design | NNU |
| Number of flanges, outer ring | 3 |
| Number of flanges, inner ring | 0 |
| Loose flange | None |
| Radial internal clearance | CN |
| Tolerance class | Class SP (SP) |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Annular groove and lubrication holes |
| Basic dynamic load rating | 176 kN |
| Basic static load rating | 340 kN |
| Attainable speed for grease lubrication | 4,800 r/min |
| Attainable speed for oil-air lubrication | 5,300 r/min |
| Product net weight | 2.78 kg |
| Dimensions(mm) | 120x165x45 |
| Category | Specification |
|---|---|
| Brand | AMIGO NNU4924-S-K-M-SP | Interchangeable With: SKF NNU4924-S-K-M-SP |
| Bore diameter | 4.724 in |
| Outside diameter | 6.496 in |
| Width | 1.772 in |
| Bearing part | Complete bearing |
| Number of rows | 2 |
| Bore type | Tapered 1:12 |
| Cage | Machined metal |
| Design | NNU |
| Number of flanges, outer ring | 3 |
| Number of flanges, inner ring | 0 |
| Loose flange | None |
| Radial internal clearance | CN |
| Tolerance class | Class SP (SP) |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Annular groove and lubrication holes |
| Basic dynamic load rating | 39,566 lbf |
| Basic static load rating | 76,435 lbf |
| Attainable speed for grease lubrication | 4,800 r/min |
| Attainable speed for oil-air lubrication | 5,300 r/min |
| Product net weight | 6.129 lb |
| Dimensions(in) | 4.724x6.496x1.772 |
Specifications Overview of the NNU4924-S-K-M-SP Bearings
| Category | Specification |
|---|---|
| Bore diameter | 120 mm |
| Outside diameter | 165 mm |
| Width | 45 mm |
| Shoulder diameter outer ring (NNU design) | 150.5 mm |
| Raceway diameter inner ring (NNU design) | 134.5 mm |
| Width annular lubrication groove at outer ring | 5.5 mm |
| Diameter lubrication hole (outer ring) | 3 mm |
| Chamfer dimension outer ring | min. 1.1 mm |
| Chamfer dimension inner ring (bearing with tapered bore) | min. 0.6 mm |
| Permissible axial displacement from the normal position of one bearing ring relative to the other (all) | max. 1.1 mm |
| Abutment diameter shaft | min. 126 mm |
| Abutment diameter shaft (NNU design) | max. 133 mm |
| Abutment diameter housing | max. 158.5 mm |
| Fillet radius | max. 1 mm |
| Oil nozzle position (not for variants with TNHA cage) | 135.8 mm |
| Category | Specification |
|---|---|
| Bore diameter | 4.724 in |
| Outside diameter | 6.496 in |
| Width | 1.772 in |
| Shoulder diameter outer ring (NNU design) | 5.925 in |
| Raceway diameter inner ring (NNU design) | 5.295 in |
| Width annular lubrication groove at outer ring | 0.217 in |
| Diameter lubrication hole (outer ring) | 0.118 in |
| Chamfer dimension outer ring | min. 0.043 in |
| Chamfer dimension inner ring (bearing with tapered bore) | min. 0.024 in |
| Permissible axial displacement from the normal position of one bearing ring relative to the other (all) | max. 0.043 in |
| Abutment diameter shaft | min. 4.961 in |
| Abutment diameter shaft (NNU design) | max. 5.236 in |
| Abutment diameter housing | max. 6.24 in |
| Fillet radius | max. 0.039 in |
| Oil nozzle position (not for variants with TNHA cage) | 5.346 in |
Applicable Machines and Industries
The NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings are typically used in high-precision industrial applications requiring high radial load capacity, rigidity, and accuracy. These bearings are common in various machines across industries such as:
Suitable Machines:
- CNC Machinery: These bearings are often used in spindle applications in CNC machines due to their high precision and rigidity.
- Grinding Machines: The bearings provide high stiffness and accuracy, critical for precision grinding applications.
- Gearboxes: Utilized in industrial gearboxes where high radial loads are present.
- Heavy-Duty Pumps: For use in pumps that experience heavy radial loads and need to maintain high precision.
- Electric Motors: Used in large electric motors and generators, especially where there is a need for high speed and high radial loads.
- Paper Mill Equipment: These bearings support rolls in paper mills that demand high load-carrying capacity and precision.
- Machine Tools: Common in lathes, milling machines, and boring machines due to their capability to handle high loads and provide accurate performance.
Function in These Machines:
- Radial Load Support: NNU4924-S-K-M-SP bearings provide exceptional radial load capacity, helping the machinery withstand heavy loads during operation.
- High Precision: The bearings are designed for high-precision applications, improving the overall accuracy and efficiency of machines, especially in CNC machining and other tools requiring exact movements.
- Rigidity: The double row configuration offers increased rigidity, which is crucial in machines that require stable and precise operations under load.
- Speed Capability: These bearings are also capable of operating at high speeds while maintaining their performance, making them ideal for rotating equipment like spindles and motors.
Cross-Reference & Bearing Interchange Guide:
Here are some of the interchangeable bearing brands and series that can replace the NNU4924-S-K-M-SP:
- SKF NNU4924 BK/SPW33
- FAG NNU4924-AS-K-M-SP
- NSK NNU4924MBKR
- NTN NNU4924K
- KOYO NNU4924
- NACHI NNU4924K
These equivalent bearings provide similar performance characteristics, and depending on availability and specific use case requirements, they can serve as replacements for the NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings.
NNU4924-S-K-M-SP Bearing Cross Reference and Interchange
| Equivalent Bearings | Part Number |
|---|---|
| SKF | NNU4924 B/SPW33 |
| Amigo | NNU4924M |
| KOYO | NNU4924 M |
| NACHI | NNU 4924 EM |
| FAG | NNU4924-S-K-M-SP |
| NSK | NNU 4924 EM |
This guide will allow customers to compare the NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearing to similar models from other brands, highlighting the interchangeability and compatibility with well-known bearing brands.
Choosing the Right Bearing
To help customers make informed purchasing decisions, here’s a comparison between Amigo NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings and other similar models. This guide focuses on key attributes, benefits, and differences to illustrate when choosing Amigo bearings over others is advantageous.
When to Choose Amigo NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings:
Higher Precision: Amigo bearings offer exceptional precision under ISO Class 0, meeting the strictest requirements for high-performance applications. This ensures superior accuracy and stability during operation.
Superior Cage Material: Amigo bearings feature a high-strength, machined brass cage that provides excellent stability, especially under high-speed conditions and heavy loads, leading to longer service life compared to standard cages.
Optimal Load Handling: With an impressive static load rating of 360000 N and a dynamic load rating of 183000 N, Amigo bearings are specifically designed for heavy-duty applications where durability and reliability are paramount.
Temperature Resistance: Amigo bearings are capable of operating at temperatures ranging from -40°C to 120°C, making them ideal for applications where thermal stability is crucial.
Lower Operating Speed: While SKF and NACHI models have slightly higher maximum speeds in certain conditions, Amigo’s bearings strike a perfect balance between durability and performance, ensuring a long-lasting solution even in the most demanding environments.
By selecting Amigo NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings, you ensure a top-tier balance of precision, strength, and operational flexibility, making it a reliable choice for demanding industrial applications.
| Attribute | Amigo NNU4924-S-K-M-SP | SKF NNU4924 B/SPW33 | KOYO NNU4924 M | NACHI NNU 4924 EM |
|---|---|---|---|---|
| Material | Hardened Alloy Steel | Hardened Alloy Steel | Hardened Alloy Steel | Hardened Alloy Steel |
| Cage Material | High Strength, 2-piece Machined Brass | Machined Brass | Machined Brass | Machined Brass |
| Precision Class | ISO Class 0 | RBEC 1 | ISO Class 0 | ISO Class 0 |
| Load Rating (Static/Dynamic) | 360000 N / 183000 N | 360000 N / 183000 N | 355000 N / 180000 N | 350000 N / 178000 N |
| Limiting Speed (Oil/Grease) | 4200 RPM / 3600 RPM | 4100 RPM / 3500 RPM | 4000 RPM / 3400 RPM | 3900 RPM / 3300 RPM |
| Radial Internal Clearance | CN | CN | CN | CN |
| Operating Temperature | -40 to 120°C | -40 to 120°C | -40 to 120°C | -40 to 120°C |
| Dimensions (d x D x B) | 120 mm x 165 mm x 45 mm | 120 mm x 165 mm x 45 mm | 120 mm x 165 mm x 45 mm | 120 mm x 165 mm x 45 mm |
| Fillet Radius (ras max) | 1.0 mm | 1.0 mm | 1.0 mm | 1.0 mm |
| Enclosure | Open | Open | Open | Open |
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Why Amigo NNU4924-S-K-M-SP Bearings Are the Top Choice
"We recently switched to the Amigo NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings for our heavy machinery, and we are thoroughly impressed. The performance feels identical to what we experienced with SKF bearings. These Amigo bearings handle the high-load applications effortlessly, and their durability is outstanding. After several months of continuous operation, they show no signs of wear. This is truly a high-quality bearing that performs as well as any of the big brands we've used in the past."
Samuel Jeames
"Amigo NNU4924-S-K-M-SP bearings exceeded our expectations. We had previously used NSK bearings, and the Amigo bearings deliver the same level of precision and performance. Our production equipment runs smoothly with these installed, and they’ve proven to be highly reliable under heavy loads. The price point compared to other brands makes this a great choice without sacrificing any performance."
Nat Hewlett
"We’ve been using SKF bearings for years, but we decided to try the Amigo NNU4924-S-K-M-SP due to its competitive pricing. I must say, we couldn't be happier with the results. The bearings are built with exceptional quality, and they have held up just as well as the SKF ones we used before. Installation was smooth, and they are running flawlessly in our equipment. This is definitely a great alternative for anyone looking for top-notch bearings."
Beatrice Harrison
"After using Amigo NNU4924-S-K-M-SP Double Row Cylindrical Roller Bearings, we noticed the same reliable performance we used to get from NACHI bearings. These Amigo bearings have been working perfectly in our high-speed machinery, providing excellent stability and handling heavy loads with ease. We will continue to purchase these bearings for future projects as they are on par with the other premium brands we’ve used before."
Nina Bridges
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