NTN 6308 deep groove ball bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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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 →NSK and NTN: matching part numbers →NTN and TIMKEN: matching part numbers →NTN and RKB: matching part numbers →NTN and KOYO: matching part numbers →
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Decoding NTN 6308
- 63Series
- Deep groove ball bearings, 63 series. Series differ in outside diameter and width even when the bore is the same.
- 08Bore
- Bore 40 mm (08 × 5).
6308 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN 6308 measures 40 mm across the bore and 90 mm across the outside diameter; its width is 23 mm (40 x 90 x 23 mm).
NTN 6308 belongs to deep groove ball 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 6308 and any equivalents.
Deep groove ball bearings are the most common bearing type, featuring two rings, a cage, and a row of balls that handle radial and axial loads in both directions. They are found in electric motors, pumps, fans, gearboxes, and machine tools. We supply the NTN line with metric sizes and light, medium, and extra-light series to match different speed and load needs.
The part number tells you the series and bore. The first two digits indicate the series: 60 for light, 62 for medium, 63 for heavier duty, and 68 and 69 for extra-light designs where space is tight. The last two digits give the bore diameter. For example, 6008, 6009, and 6010 are all in the 60 series but have different bores. Numbers with a slash, such as 68/500, 68/530, 68/560, and 68/600, denote large bore diameters in the extra-light series. Suffixes cover sealing, internal clearance, or cage type.
These bearings appear in many industrial settings: electric motors, centrifugal pumps, fans, compressors, conveyor belts, machine tools, and process equipment. They also suit low- and medium-power applications that need low friction and straightforward maintenance. Since they are used widely, they are common in both new equipment and replacement work, so the range of sizes and variants in the NTN line is broad.
When selecting, consider the sealing method: open, metal shielded, or rubber sealed, depending on whether the environment has dust, moisture, or splashes. Internal clearance and cage design also affect speed and operating temperature. During installation, pay attention to alignment between supports, cleanliness of the shaft and housing, and proper fit, because over-tightening or impact on the balls can shorten service life. Correct lubrication completes the job.
Interchangeability between brands relies on designation and dimensions: a bearing from the 60, 62, or 63 series can usually be replaced by an equivalent from another brand if bore, outer diameter, and width match. When the part number alone is not enough, compare dimensions and sealing type. If you have a part number from another brand or an unidentified part, send us the details and we will suggest a compatible alternative.
For a specific size or part number, send it via WhatsApp. We will quote the NTN bearing you need and reply promptly.
Dimensions
40 x 90 x 23 mm (d x D x B): boundary dimensions for basic designation 6308, according to ISO 15.
- Bore
- 40 mm
- Outside diameter (D)
- 90mm
- Width (B)
- 23mm
SKF and other brands, same size
Other brands' pages with basic designation 6308: 40 x 90 x 23 mm (d x D x B) per ISO 15.
- Need the SKF 6308? We can also quote:63086308/C36308/C433 more →
- FAG6308-C6308-C-2Z6308-C-2HRS
- KOYO6308
- NSK63086308 ZZ
- RKB6308
- TIMKEN6308
What they share are the ISO 15 boundary dimensions, not the specs: seals or shields, internal clearance, cage and load rating may vary with brand and suffix. Every quote is by full part number.
Frequently asked questions
- NTN 6308 bearing: what are its dimensions?
- NTN 6308 measures 40 mm across the bore and 90 mm across the outside diameter; its width is 23 mm (40 x 90 x 23 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 6308.
- What do the numbers in 6008, 6009, or 6010 mean?
- The first two digits indicate the series and the last two the bore diameter. The 60 series is light; within it, 6008, 6009, and 6010 have different bore sizes. Send the full part number via WhatsApp for a quote.
- How do I choose between an open and a sealed bearing?
- Open bearings are used when lubricant is renewed often and the environment is clean. Sealed or shielded bearings offer better protection against dust and moisture. The choice depends on the equipment and working conditions. If unsure, contact us with the part number and application.
- Can I replace a bearing from another brand with an NTN one?
- Usually yes, if the main dimensions and sealing type match. The 60, 62, and 63 series have cross-brand interchanges. Send the original part number via WhatsApp and we will indicate the compatible NTN reference.