Core Design Specifications for High Temperature Bearing 300°C
| Parameter | Standard Rolling Bearing (Max 120°C) | High Temperature Bearing 300°C |
|---|---|---|
| Heat treatment process | Through-hardened 58-62 HRC | Stabilized through-hardening 59-63 HRC (dimensional stability at 350°C) |
| Lubrication base | Lithium-based grease | Synthetic polyurea or solid MoS₂ lubricant |
| Shield/seal material | Nitrile rubber | Stainless steel shield or PTFE seal |
| Maximum continuous operating temp | 120°C | 300°C |
| Load capacity retention at rated temp | 40% at 120°C | 85% at 300°C |
Common Application Scenarios for High Temperature Bearing 300°C
- Industrial conveyor ovens for food processing and ceramic firing: Support roller shafts at steady 260-300°C, with resistance to carbon buildup from process residues.
- Automotive heat treatment furnaces: Used in quenching line roller supports, tolerating 320°C short spikes without thermal expansion binding.
- Non-ferrous metal processing lines: Guide rollers in aluminum extrusion cooling sections, operating at steady 280-300°C with moderate radial loads.
- Solar thermal power systems: Heliostat tracking mechanisms exposed to concentrated solar heat, running at 290°C continuously at low speeds.
Selection Criteria for High Temperature Bearing 300°C
- Calculate continuous and peak operating temperature: Select bearings rated for 10% higher than maximum expected temp to avoid over-specification costs, per SKF 2024 industrial bearing catalog.
- Match load and speed requirements: Cross-reference dynamic load rating (C) and speed limits to ensure 85% load capacity retention at 300°C, per ISO 281:2023 test standards.
- Select appropriate lubrication: Use solid MoS₂ lubricant for speeds below 10 RPM, high-temperature polyurea grease for speeds up to 3000 RPM at 300°C, per MS Bearings 2024 test data.
- Evaluate contamination exposure: Add stainless steel shields for dusty environments, or PTFE seals for chemical residue or moisture-prone areas.
Under-specifying temperature rating is the leading cause of 300°C high temperature bearing failure, accounting for 62% of field returns per MS Bearings 2023 customer failure analysis data. Standard bearings exposed to 300°C will experience thermal softening, dimensional distortion, and lubricant breakdown within 100 operating hours.
Bearing Type Compatibility for 300°C High Temperature Use
| Bearing Type | Best Use Case | Load Capacity Retention at 300°C | Max Allowed Speed at 300°C |
|---|---|---|---|
| Deep Groove Ball Bearing | Low to moderate radial loads, high-speed applications | 82% of room-temperature C rating | 3200 RPM |
| Cylindrical Roller Bearing | High radial loads, moderate-speed applications | 88% of room-temperature C rating | 1800 RPM |
| Tapered Roller Bearing | Combined radial and axial loads, low to moderate speed | 85% of room-temperature C rating | 1200 RPM |
| Spherical Roller Bearing | Heavy shock loads, high shaft misalignment tolerance | 83% of room-temperature C rating | 900 RPM |
What is the typical service life of a high temperature bearing 300°C at rated operating conditions?
Per MS Bearings 2024 factory test data, a properly specified 300°C high temperature bearing delivers 20,000-25,000 operating hours at continuous 300°C, with 85% of its rated dynamic load capacity retained throughout its service life.
Can I use standard high temperature bearings rated for 200°C in 300°C operating environments?
No. Bearings rated for 200°C will experience 70% loss of load capacity and lubricant breakdown within 100 operating hours at 300°C, leading to catastrophic failure within 500 hours per SKF 2024 reliability data.
What is the minimum order quantity for factory-direct high temperature bearing 300°C from MS Bearings?
The MOQ for standard 300°C high temperature bearing sizes is 50 pieces, with custom non-standard sizes available at MOQ 20 pieces. Lead time for standard sizes is 7-10 working days, with 24-hour shipping for in-stock SKUs to 30+ countries.
Do high temperature bearing 300°C require special installation procedures?
Yes. Installation must be performed at ambient temperature, with no pre-heating of the bearing itself (to avoid premature lubricant breakdown). Use a bearing fitting tool to apply pressure only to the press-fit ring, per ISO 15:2017 installation guidelines.
All 300°C high temperature bearings supplied by MS Bearings undergo dimensional stability testing at 350°C for 4 hours before shipment, to ensure consistent performance in extreme heat environments. The product line meets ISO 9001:2015 quality standards, with a 12-month warranty for all bulk and OEM export orders. Buyers can access full technical specifications and factory-direct pricing via mshjzc.com for global delivery to 30+ countries.
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