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BL309NR Maximum Capacity Deep Groove Ball Bearing
- Increased Radial Load Rating: The filling slot allows for a greater number of rolling elements, significantly boosting radial capacity over standard deep groove bearings.
- Simplified Axial Mounting (NR): The included snap ring allows the bearing to be easily secured against a housing shoulder, reducing machining costs for the equipment manufacturer.
- Meticulous Manual Inspection: Each BL309NR is hand-checked in our Yandian facility to guarantee the snap ring is perfectly seated and the raceway is flawless.
- High-Rigidity Forging: Advanced thermal treatment ensures the outer ring maintains its shape even under heavy transmission stress.
Product Specifications
| Specification | Details |
| Item Type | Maximum Capacity Deep Groove Ball Bearing |
| Model Number | BL309NR |
| Bearing Design | Single Row, Filling Slot Type |
| Additional Features | Snap Ring and Groove (NR) |
| Material | GCr15 / SAE 52100 Bearing Steel |
| Cage Material | Stamped Steel |
Product IntroductionThe BL309NR is a specialized maximum capacity deep groove ball bearing, engineered specifically for applications that require higher radial load support than a standard 6309 bearing can provide. The "BL" designation indicates the presence of a filling slot, allowing for the insertion of more, and often larger, steel balls. The "NR" signifies the integration of a snap ring and groove on the outer ring, which heavily simplifies axial mounting in automotive transmissions and industrial gearboxes. Because the filling slot interrupts the raceway shoulder, absolute precision in machining and assembly is required. Inside our dedicated residential assembly facility, our mechanics perform rigorous manual spin-tests to ensure the balls track perfectly past the filling slot without microscopic snagging. This hands-on validation ensures your B2B clients receive a highly durable, perfectly aligned component.
Applications
Automotive manual and automatic transmissions.
Heavy-duty agricultural PTO (Power Take-Off) gearboxes.
Industrial speed reducers and electric motors requiring high radial support.
Equivalent Models
218 (Some older maximum capacity series designations)
309NR (Max Capacity Variant)
Cross Reference
SKF: BL 309 NR
FAG: M6309-NR
NSK: BL309NR
FAQ
Q: Can the BL309NR handle high axial (thrust) loads?
A: No. Because of the filling slot on the raceway shoulder, maximum capacity bearings have very limited axial load capacity compared to standard deep groove ball bearings. They are designed for heavy radial loads.
Q: Does it come pre-lubricated?
A: Standard BL309NR bearings are open (unsealed) and coated in a rust-preventative oil. They must be lubricated by the gearbox oil or grease during installation.
OEM & Custom Service
dbsbearing.com provides extensive customization for gearbox manufacturers, including supplying the BL309NR with specialized snap ring thicknesses or custom C3 internal clearances to manage operational heat.
Packing & Delivery
Bearings are carefully treated with rust inhibitors, wrapped in protective VCI paper, and packed in robust corrugated boxes. We consolidate B2B orders onto secure pallets to prevent any transit damage to the delicate snap rings during international shipping.
