NTN HK4520 needle roller bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Needle roller bearing
- Series
- HK
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Other brands for this category
Ask us for alternatives. We check every equivalent against the part number and your application.
SKF and NTN: matching part numbers →NTN and INA: matching part numbers →
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Description
NTN HK4520 belongs to needle 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 HK4520 and any equivalents.
The NTN HK series is a needle roller bearing built with a machined outer ring and without an inner ring. The rollers ride directly on the shaft, so the shaft must be hardened and ground. Its compact cross-section fits where ball bearings cannot, and it handles high radial loads relative to its size. Typical applications include machine tools, electric motors, pumps, compressors, and transmissions.
Reading an HK part number is straightforward: the prefix HK indicates the family, followed by digits for bore diameter and width. For instance, HK2520 means a 25 mm bore and 20 mm width, HK2820 a 28 mm bore and 20 mm width, and HK3520 a 35 mm bore and 20 mm width. Suffixes in the catalog denote sealing, tolerance, or cage variations, which should be reviewed for each application.
These bearings are selected for equipment where radial space is tight and speeds are moderate to high. Common uses include machine tools, electric motors, pumps, compressors, gearboxes, conveyor rollers, textile machinery, bottling lines, and agricultural equipment. The low profile and radial load capacity suit support points with limited axial room.
When choosing an HK bearing, verify the shaft diameter and hardness. The shaft becomes the inner raceway, so it needs proper surface hardness and a fine finish. Check shaft-to-housing alignment to prevent accelerated wear. Lubricate with grease or oil, and select sealing based on the environment: open for clean interiors, sealed for dust or moisture. Install with appropriate tools and avoid striking the rollers.
HK series bearings interchange with other brands that follow the same dimensional designation, such as SKF, FAG, NSK, or INA. Interchangeability depends on bore, outer diameter, width, and cage type. If you have a code from another brand, our team can quote it and provide the exact equivalent. Always confirm tolerances and internal clearance before substituting.
To request a quote, send the HK code or dimensions via WhatsApp or email. We respond promptly and help you select the correct variant for your application.
Dimensions
Dimensions and tolerances: Message us the part number on WhatsApp and we'll verify its dimensions and version with the manufacturer's datasheet.
Frequently asked questions
- What does the HK prefix indicate on a needle roller bearing?
- HK denotes a needle roller bearing with a machined outer ring and no inner ring. The following numbers give bore diameter and width. For example, HK2520 has a 25 mm bore and 20 mm width.
- Can an HK bearing run directly on the shaft?
- Yes, the shaft acts as the raceway. It must be hardened and ground with suitable hardness and surface finish. If not, use a bearing with an inner ring.
- How do I get a quote for an HK bearing?
- Contact us via WhatsApp or email with the full code or the bore, outer diameter, and width. We reply promptly and can suggest equivalents if you have another brand's code.