45mm Bore RN309M Brass Cage Cylindrical Roller Bearing without Outer Ring
| Item No : | RN309M |
| Size (d*D*B) : | 45×86.5x25mm |
| Material : | |
| Lead Time : | 3-5 days |
| Weight : | 0.613KG |
| MOQ : | 10 pcs |
⚙️Product Description:
Designing heavy-duty industrial machinery under strict radial space limits where severe shock loads and high vibrations threaten standard components? Our RN309M Cylindrical Roller Bearing (Size: 40×86.5x25mm) is precision-engineered to be your ultimate powertrain solution. Featuring a specialized “RN” configuration—comprising a precision inner ring and a roller-and-cage assembly with no outer ring—it allows the rollers to run directly on a hardened and ground housing bore, maximizing shaft stiffness and space-saving layout efficiency. Upgraded with a premium machined brass cage (“M” suffix), it offers unmatched dimensional stability, superior lubrication enhancement, and extreme friction reduction under punishing speeds. As a strategic B2B bearing partner, we supply this high-capacity component via our direct factory “RMO” brand for optimized wholesale profitability, while maintaining the supply network to source alternative premium global tier-1 brands based on your project criteria.
⚙️Product Features:
- Space-Saving RN Configuration: No outer ring layout enables a larger shaft diameter and massive radial load ratings within a highly restricted radial installation envelope.
- Heavy-Duty Machined Brass Cage (M): Delivers superior structural integrity, reduced heat generation, and premium wear resistance under intense vibration and shock loads.
- Logarithmic Roller Profile: Precision-ground cylindrical rollers eliminate edge stress concentration, ensuring uniform load distribution and prolonged service life.
- Premium Hardened Chrome Steel: Rings and rollers are manufactured from premium GCr15 high-carbon chromium steel, deep-hardened to achieve maximum fatigue life.
- Flexible Dual-Brand Supply Strategy: Scale your regional distribution with our cost-efficient factory-direct RMO brand, or utilize our trade desk to source authentic global premium brands.
⚙️Product Applications:
Engineered for maximum radial capacity and superior durability in rugged operations, the RN309M brass cage bearing is widely applied in:
- Heavy-duty industrial gearboxes, speed reducers, and mining planetary drives.
- Large automotive transmissions, commercial vehicle power take-offs (PTO), and truck axles.
- High-pressure industrial pumps, centrifugal compressors, and petroleum drilling rigs.
- Metalworking rolling mill pinion stands and paper processing machinery drive rollers.
- Heavy construction equipment, vibratory soil compactors, and railway traction motors.
⚙️Precautions:
| 1. Keep clean | 2. Use with caution | 3. appropriate tool | 4. Hot-loading | 5. Be careful of rust |
| Dust will have a bad effect on the bearing, so keep the surrounding clean. | Strong impact during use can easily cause scratches and indentations. | Avoid replacing existing tools, and use appropriate tools. | Bearings are precision parts, so hot installation is recommended. | Sweat on your hands during operation will cause rust, so it is best to wear gloves. |
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⚙️Obtain Certificate:
About Rimao
Since its establishment in 2011, Rimao Bearing has combined international vision with local wisdom and injected innovative ideas into every bearing and pulley with its profound industry accumulation and unremitting pursuit of technology. We have not only passed CE and ROHS certification, but also set a new benchmark in the industry and led the development trend of the bearing industry.
We are not just a ball bearing and roller bearing importer and wholesaler. We provide real solutions to help you achieve the product and design goals set by your customers. With more than 20 years of production and sales experience, tens of thousands of models and specifications, we look forward to cooperating with you!
⚙️Technical Parameters:
| Model No. | |
| Bearing Type | Cylindrical Roller Bearing – No Outer Ring |
| Size | 45×86.5x25mm |
| Rings & Rollers Material | |
| Cage Material | Machined Brass Cage |
| Precision Class | ISO P6 / ABEC-3 Grade |
| Radial Internal Clearance | C0 (Standard) / C3 (High-Speed Thermal Expansion Optional) |
| Brand | RMO / TMB / Neutral / OEM / Other Brands |
| Package | Individual plastic bag, plastic tube or original RMO brand box |
| Lead Time | 3-5 days for stock; 7-15 days for bulk orders |
| Shipping | Express (DHL/FedEx/UPS), Air Freight, Sea Freight |
| Payment | 100% T/T, or 30% T/T In Advance, 70% T/T After Finished Production |
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