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Help CenterOil-Impregnated Sintered Bronze Bushing, 0.8-1.2 ASTM B438 Grade, 25 MPa Dynamic Load
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Welcome to Anping County Boli Hardware Wiremesh Products Factory – a trusted manufacturer since 1998, specializing in high-performance powder metallurgy components. Our Oil-Impregnated Sintered Bronze Bushing (ASTM B438 Grade, 0.8-1.2 g/cm³ density, 25 MPa dynamic load) is engineered to deliver reliable, self-lubricating performance in demanding applications. By combining decades of sintering expertise with rigorous quality control, we offer bushings that reduce friction, extend equipment life, and eliminate the need for external lubrication systems. Whether you require standard sizes or custom dimensions, our factory in Hengshui, Hebei, China is ready to support your bulk orders with competitive pricing and timely delivery.
Product Overview & Key Features
Oil-impregnated sintered bronze bushings are porous bearings that absorb and retain lubricating oil within their structure. During operation, the oil is released to the shaft surface, providing a continuous, low-maintenance lubrication film. This design is ideal for applications where relubrication is difficult or undesirable.
- Self-Lubricating Operation: The porous bronze structure holds up to 30% oil by volume, ensuring consistent lubrication over the bushing's life.
- High Dynamic Load Capacity: Rated for 25 MPa dynamic loads, our bushings withstand heavy-duty cycles in presses, pumps, and conveyor systems.
- ASTM B438 Grade Compliance: Manufactured to meet strict material and dimensional standards, ensuring repeatable quality.
- Low Friction Coefficient: Typically 0.04–0.08, reducing wear on mating shafts and lowering energy consumption.
- Durable Bronze Alloy: Excellent corrosion resistance and thermal conductivity, suitable for temperatures up to 200°C (392°F).
- Customizable Dimensions: Available in a wide range of inner diameters, outer diameters, and lengths to fit your design.
| Parameter | Specification |
|---|---|
| Material Composition | Sintered Bronze (Cu + Sn + other elements per ASTM B438) |
| Density Range | 0.8 – 1.2 g/cm³ |
| Dynamic Load Capacity | 25 MPa (max) |
| Oil Content (by volume) | ≥ 18% (typical 20–30%) |
| Operating Temperature Range | -40°C to +200°C |
| Coefficient of Friction | 0.04 – 0.08 (lubricated) |
| Available Shapes | Cylindrical, Flanged, Thrust Washers |
Technical Details & Benefits
Our sintering process uses high-purity bronze powders blended with a pore-forming agent, then compacted and sintered at controlled temperatures. The resulting bushing has a uniform porosity that is impregnated with premium mineral or synthetic oil under vacuum. This ensures maximum oil retention and consistent release under load.
Key Benefits for Your Application:
- Reduced Maintenance: Eliminates the need for frequent greasing or oil injection, saving labor and downtime.
- Extended Shaft Life: The soft bronze surface protects harder shafts from scoring and galling.
- Quiet Operation: The oil film dampens vibration and noise, ideal for precision equipment.
- Cost-Effective: Lower total cost of ownership compared to rolling element bearings in many low-to-medium speed applications.
- Design Flexibility: We can produce bushings with grooves, holes, or special chamfers per your drawing.
Our 25 MPa dynamic load rating ensures reliable performance even under intermittent shock loads. For applications requiring higher loads, please consult our engineering team for custom grades.
Quality Assurance & Company Strengths
Anping County Boli Hardware Wiremesh Products Factory has been a dedicated manufacturer since 1998. With an annual export value of US$5–10 million, we serve clients across North America, South America, Europe, Asia, Africa, Oceania, and the Middle East. Our products are shipped from major ports including Tianjin, Qingdao, Shanghai, and Foshan. We adhere to strict in-house quality checks, including density verification, oil content analysis, and dimensional inspection. Our experienced team ensures that every batch meets ASTM B438 Grade requirements.
We understand that consistent quality and on-time delivery are critical for your business. That is why we maintain a flexible production capacity and stock popular sizes for quick turnaround. Whether you need a prototype or a full container load, we are ready to support your procurement needs.
Ready to enhance your equipment’s performance? Contact us today for a quote or technical consultation. Let us provide you with the durable, self-lubricating bushings that keep your machinery running smoothly.
Frequently Asked Questions
Q1: What is the typical porosity of an oil-impregnated bronze bushing?
A: The porosity typically ranges from 15% to 30% by volume, depending on the density grade. Our 0.8-1.2 g/cm³ density corresponds to approximately 20–30% porosity, allowing high oil retention.
Q2: Can these bushings be used in food processing equipment?
A: Standard bronze bushings are not food-grade. However, we can supply bushings impregnated with NSF H1 food-grade lubricants upon request. Please specify your requirements.
Q3: What is the maximum speed for these bushings?
A: The maximum surface speed depends on load, lubrication, and shaft finish. Typically, sintered bronze bushings can operate at PV values up to 2.0 MPa·m/s for continuous duty. For higher speeds, consult our engineering team.
Q4: Do you offer precision-machined tolerances?
A: Yes, we can provide bushings with tolerances as tight as ISO IT7/IT8 on inner diameter and outer diameter. Standard products are supplied with a clearance fit suitable for general applications.
Q5: How do I determine the correct size for my application?
A: The bushing inner diameter should match the shaft diameter with a recommended clearance of 0.015–0.050 mm per mm of shaft diameter. Our technical team can help you select the right size based on load, speed, and environment.
Q6: What is the minimum order quantity (MOQ)?
A: MOQ varies by size. For standard small sizes, the MOQ is 500 pieces. Custom sizes may have a higher minimum. Please contact us for a specific quote.
Q7: How are these bushings packaged for export?
A: They are carefully packed in plastic bags, then placed in corrugated cartons with foam separation. For large orders, we use wooden pallets or crates to prevent damage during transit.
Q8: Can you provide a material certificate or test report?
A: Yes, a mill test certificate (MTC) with actual density, oil content, and chemical composition can be provided with each shipment at no extra cost.
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