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6305 Deep Groove Ball Bearing 25x62x17mm
The 6305 bearing bridges the gap between light-series 62xx bearings and medium-series 63xx designs. At 25mm bore with a 62mm OD, it delivers 22.5 kN dynamic load in an envelope 10mm narrower than the next size up.
Key Specifications
- Sealing: Open, ZZ (metal shields), 2RS (NBR rubber contact seals). ZZ configuration retains full rated speed.
- Speed and Load: 22.5 kN dynamic (Cr), 11.6 kN static (Cor). 9,000 RPM open/ZZ; 5,500 RPM with 2RS seals.
- Axial Load: Supports 15-20% of radial rating as axial load in CN clearance. Approximately 3.4-4.5 kN sustained.
- Temperature: -40 to 120 C with standard grease. High-temperature grease options extend to 150 C.
- Material and Precision: GCr15 bearing steel (AISI 52100 equivalent). ABEC-3 standard; ABEC-5 available.
For any inquiries, please contact with our Supporting Team at sales@yuanhecd.com.
| Model | 6305 |
| Bore (d) | 25 mm |
| OD (D) | 62 mm |
| Width (B) | 17 mm |
| Type | Open / Shielded / Sealed |
| ABEC | ABEC-3 |
| Material | GCr15 bearing steel (AISI 52100) |
| Dynamic Load Cr | 22.5 kN |
| Static Load Cor | 11.6 kN |
| Max Speed | 9,000 RPM (open/ZZ) 5,500 RPM (2RS) |
| Temperature | -40 to 120 C |
Bore x OD x Width
25 x 62 x 17 mm
Dynamic Load Cr
22.5 kN
Static Load Cor
11.6 kN
Max Speed
9,000 RPM
Sealing
Open / ZZ / 2RS
Precision
ABEC-3
Shielding and Lubrication
The 6305 ZZ bearing uses non-contact SPCC steel shields pressed into the outer ring. The labyrinth gap between shield and inner ring shoulder retains factory-packed polyurea grease without adding rotational drag, preserving the 9,000 RPM speed ceiling. Each bearing ships at 25 to 35 percent fill, adequate for the design service life under normal enclosed operating conditions without field relubrication.
The 6305 2RS bearing variant substitutes nitrile contact seals riding on the inner ring land. The seal lip blocks moisture, coolant mist, and particulate ingress at the cost of a reduced speed limit around 5,500 RPM. At 17mm width, the 6305 bearing holds more grease volume than narrower 62-series bearings in the same bore class, extending relubrication intervals in continuous-duty installations.
Performance
At 22.5 kN dynamic and 11.6 kN static, the 6305 bearing delivers 41% more capacity than the 6205 bearing (25x52x15mm, 14.0 kN Cr). The gain comes from the series-3 cross-section: 10mm larger OD and 2mm extra width increase the roller path length and ball complement within the same 25mm bore. The tradeoff is envelope size. A 6005 bearing (25x47x12mm, 10.1 kN) saves 15mm OD and 5mm width. Select the 6305 bearing when radial load governs the design. If the housing OD is fixed at 52mm or below, specify a 6205 or 6005 bearing instead.
ABEC-3 tolerance is standard, producing raceway runout within 5 microns. For spindle and instrumentation applications where radial runout drives the specification, ABEC-5 is available. C3 radial clearance suits deep groove ball bearing applications in electric motors where the shaft thermally expands relative to the housing.
OEM and Customization
Yuanhe manufactures the 6305 bearing to customer specifications. Common OEM customizations include C3 or C4 internal clearance for press-fit housings and thermal growth conditions, stainless steel (AISI 440C) rings and balls for food processing and marine environments, and high-temperature polyurea or fluorinated grease for kiln fans and continuous ovens above 120 C. Cage materials include stamped steel, glass-reinforced polyamide (PA66-GF25), and machined brass. Standard lead time is 7 to 15 days. Submit drawings or existing part numbers for a quote, or contact Yuanhe directly.
Applications
Electric motors (3 to 10 hp)
Industrial gearboxes and speed reducers
Centrifugal and gear pumps
Conveyor drive pulleys and idlers
HVAC blower assemblies
Agricultural implement hubs and PTO shafts
Textile machinery rollers
Compact hydraulic power units
Bench and pedestal grinders
Frequently Asked Questions
What is the difference between 6305 ZZ bearing and 6305 2RS bearing configurations? +
The 6305 ZZ bearing uses non-contact metal shields that retain grease while allowing full rated speed (9,000 RPM). The 6305 2RS bearing uses NBR rubber contact seals on the inner ring shoulder, providing IP54-level dust and splash protection but limiting speed to approximately 5,500 RPM. Choose ZZ for clean, high-speed environments. Choose 2RS for dusty, wet, or washdown conditions.
What is the maximum radial and axial load for a 6305 bearing? +
Radial dynamic load rating is 22.5 kN (Cr) and static load rating is 11.6 kN (Cor). Axial load capacity in standard CN clearance is approximately 15-20% of Cr: 3.4-4.5 kN sustained. C3 clearance increases axial capacity to roughly 25% of Cr (5.6 kN). For pure thrust loads above these values, an angular contact or thrust bearing is recommended.
Is the 6305 bearing dimensionally interchangeable with other 25mm-bore bearings? +
The 6305 bearing follows ISO 15 boundary dimensions: 25mm bore, 62mm OD, 17mm width. It is not interchangeable with the 6205 bearing (52mm OD, 15mm width) or 6005 bearing (47mm OD, 12mm width). Each series fits a different housing bore. Verify housing dimensions before substituting across series.
What grease and cage options does Yuanhe offer for the 6305 bearing? +
Standard: lithium soap grease with mineral oil base, stamped steel cage. Options: low-noise polyurea grease for electric motor applications, high-temperature fluorinated grease for continuous operation above 120 C, food-grade grease for incidental contact environments. Cage alternatives: glass-reinforced PA66 for reduced rotating mass, machined brass for applications above 7,000 RPM sustained.
