Machine Bronze Metric Bushings

What Are Machine Bronze Metric Bushings?

Machine bronze metric bushings, often referred to as cast bronze or sintered bronze sleeve bearings, are precision-crafted cylindrical components designed to reduce friction between moving parts in machinery. These bushings are typically made from high-strength bronze alloys such as SAE 660 (C93200) or CuSn6Zn6Pb3, known for their outstanding wear resistance, load-bearing capacity, and machinability. The term “metric” refers to their sizing, which is measured in millimeters (e.g., inner diameter, outer diameter, and length), making them perfect for equipment adhering to international or European standards. They are often machined to tight tolerances and can be self-lubricating through embedded graphite plugs or oil impregnation, reducing maintenance needs.

These bushings are commonly used in a wide range of industrial applications, including hydraulic systems, power transmission, automotive suspensions, die and mold tooling, heavy equipment, pumps, and compressors. Unlike imperial (inch-sized) bushings, the metric versions are tailored to meet global machinery standards.

Key Advantages of Machine Bronze Metric Bushings

1. Durability: Offers high corrosion resistance and the ability to withstand heavy loads and extreme temperatures.

2. Low Friction: Self-lubricating variants minimize the need for external lubrication.

3. Versatility: Available in plain sleeves, flanged, or thrust styles; customizable for specific applications.

4. Cost-Effective: Exceptional machinability makes it easier to adjust after manufacturing.

Common Bronze Alloys Used in Metric Bushings

Standard Metric Sizes (Examples)

While sizes vary by manufacturer, here are some common sizes for cast bronze sleeve bushings (ID = Inner Diameter, OD = Outer Diameter, L = Length in mm). Custom machining is widely available.

Machining Tips for Bronze Bushings

If you’re producing or modifying bronze bushings in-house, consider the following tips:

1. Use Bearing Bronze: For high-friction applications, select bearing bronze alloys (6-8% lead) for enhanced durability.

2. Sharp Carbide Tools: Use sharp carbide tools at moderate speeds (200–300 SFM) to avoid work-hardening.

3. Precision Coolants: Utilize coolants like sulfur-based oils to achieve precise tolerances (±0.01 mm).

4. Post-Machining Lubrication: Consider embedding graphite plugs for self-lubrication in metric designs.

Where to Buy Machine Bronze Metric Bushings

You can find custom metric cast bronze options, including flanged varieties, from viiplus.com.

For custom orders, contact suppliers directly for quotes—prices typically range from $5 to $50 per unit depending on size and features. For more specific recommendations, provide details on size, application, and any unique requirements.

Machine bronze metric bushings offer a durable, low-maintenance solution for a variety of industrial needs, combining strength, corrosion resistance, and excellent machinability. Whether you’re replacing worn parts or designing new machinery, these bushings provide an efficient, cost-effective option for high-performance equipment.