SKF NNU 4924 B/SPW33 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NNU 4924 B/SPW33
- NNU 49Series
- Cylindrical roller bearings, NNU 49 series. Series differ in outside diameter and width even when the bore is the same.
- 24Bore
- Bore 120 mm (24 × 5).
- B/SPW33Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NNU 4924 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NNU 4924 B/SPW33 belongs to cylindrical roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for NNU 4924 B/SPW33 and any equivalents.
For applications that combine heavy radial forces with moderate to high speeds, the SKF NNU series cylindrical roller bearing is a common choice. Its two-row design and flangeless inner ring permit a degree of axial movement, which helps when thermal expansion occurs along the shaft. You will find these bearings in gearboxes, rolling mills, heavy machinery and other demanding industrial equipment.
Reading an NNU code helps you confirm that you are specifying the right bearing. The NNU prefix denotes a two-row cylindrical roller bearing with a flangeless inner ring and a flanged outer ring. The digits that follow, such as 4920, identify the size and dimensional series. A B suffix points to a machined brass cage for strength and accurate roller guidance. SPW33 combines special tolerances with high-quality grease lubrication. A complete reference like NNU 4920 B/SPW33 therefore captures dimensions, execution and lubrication in one string.
These bearings are at home in steel, cement, mining and pulp operations, where radial loads are intense and speeds range from moderate to high. Large gearboxes, gear cases, paper machines and rolling trains also rely on them. When you need to replace one, check the full designation rather than just the bore size, because suffixes change the internal execution.
Selection should consider the radial load, the rotation speed and the environment. During mounting, use the proper tools and avoid striking the rollers directly. Shaft-to-housing alignment matters to prevent parasitic loads. The SPW33 suffix means grease is already in place, but you still need to follow the relubrication schedule. Effective sealing of the assembly keeps external contaminants out.
Interchange with other brands that share the same dimensional designation is possible, but tolerances and internal clearance can differ, so verify compatibility before substituting. MR Industrial Accessories supplies SKF bearings and can review your code to suggest an equivalent or help you choose the right execution. Send your part number by WhatsApp or email and the team will respond promptly.
Dimensions
- Bore
- 120mm
Frequently asked questions
- What do the B and SPW33 suffixes mean on an NNU bearing?
- B indicates a machined brass cage that handles high temperatures and loads. SPW33 refers to special tolerances and high-quality grease lubrication. Together they define a robust execution for demanding conditions.
- Does this bearing allow axial displacement?
- Yes, the flangeless inner ring provides some freedom of axial movement. This is useful when the shaft expands due to temperature, avoiding additional loads on the supports.
- How do I choose between an NNU and another type of roller bearing?
- The NNU is two-row with high radial capacity. If you need to support combined axial loads, evaluate other series. For purely radial loads and axial freedom, the NNU is an efficient option. Ask us on WhatsApp or email.