NTN 6309LLU deep groove ball bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Deep groove ball bearings
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Decoding NTN 6309LLU
- 63Series
- Deep groove ball bearings, 63 series. Series differ in outside diameter and width even when the bore is the same.
- 09Bore
- Bore 45 mm (09 × 5).
- LLUSuffix
- NTN suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
6309 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN 6309LLU measures 45 mm across the bore and 100 mm across the outside diameter; its width is 25 mm (45 x 100 x 25 mm).
NTN 6309LLU 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 6309LLU and any equivalents.
The NTN LLU series covers single-row deep groove ball bearings that feature contact seals on both sides. These bearings handle moderate radial and axial loads and appear in many industrial and commercial settings. Because the seals keep lubricant in and contaminants out, they work well in dusty or humid conditions. MR Industrial Accessories supplies this series as part of its bearing range.
Reading the part number helps you identify the bearing. The numeric portion—such as 6008, 6208, or 6210—defines the size and dimensional series. The LLU suffix means the bearing has synthetic rubber contact seals on both sides. These seals retain grease and block contaminants, unlike LLB (non-contact seals) or ZZ (steel shields). The 60 series is the lighter section, the 62 series is the medium section, and the 63 series is the heavier section, which determines load capacity.
In US plants, LLU series bearings are found in electric motors, centrifugal pumps, fans, conveyors, machine tools, and agricultural equipment. Their contact sealing suits environments with dust, chips, or moderate humidity, such as food processing plants, metalworking shops, and rural facilities. They also serve automotive applications like wheel bearings and transmission components, where reliability and low maintenance matter.
Selecting the right LLU bearing involves the radial and axial loads it will see, the rotation speed, and the operating environment. Contact seals offer better protection but can add friction, so for high-speed use you may want to consider non-contact seals. During mounting, align the shaft and housing properly and avoid hitting the seals. The bearing comes lubricated from the factory; if you relubricate, use a grease compatible with the original.
NTN LLU series bearings interchange with other brands that follow the same ISO dimensions. When finding a replacement, check the full part number: a 6208LLU may match a 6208-2RS from another brand if dimensions and seal type align. MR Industrial Accessories can help you confirm the exact equivalent based on your original part number.
To request a quote for NTN LLU series deep groove ball bearings, send the part number or the size you need via WhatsApp or email. The team replies promptly and can suggest a compatible alternative if needed.
Dimensions
45 x 100 x 25 mm (d x D x B): boundary dimensions for basic designation 6309, according to ISO 15.
- Bore
- 45 mm
- Outside diameter (D)
- 100mm
- Width (B)
- 25mm
SKF and other brands, same size
Other brands' pages with basic designation 6309: 45 x 100 x 25 mm (d x D x B) per ISO 15.
- Need the SKF 6309? We can also quote:6309-2RS16309-2RS1NR6309-2RS1/C331 more →
- FAG6309-C-2HRS6309-C6309-C-2Z
- KOYO6309
- NSK63096309 ZZ
- RKB6309
- TIMKEN63096309M
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 6309LLU bearing: what are its dimensions?
- NTN 6309LLU measures 45 mm across the bore and 100 mm across the outside diameter; its width is 25 mm (45 x 100 x 25 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 6309.
- What does the LLU suffix mean on an NTN bearing?
- It indicates synthetic rubber contact seals on both sides. These seals keep lubrication in and contaminants out, unlike non-contact seals (LLB) or metal shields (ZZ).
- Are NTN LLU series bearings interchangeable with other brands?
- Yes, if they meet standardized ISO dimensions. For instance, a 6208LLU may be equivalent to a 6208-2RS from another brand. Always verify the complete part number and specifications.
- How can I request a quote for an NTN LLU series bearing?
- Send the part number or the size you need via WhatsApp or email. MR Industrial Accessories will quote promptly and help you choose the best option for your application.