KSOB650 Graphite-copper Bushings

一,Product Overview

KSOB650:Graphite-copper bushings are high-performance self-lubricating sliding bearings that utilize a high-strength copper alloy as the base material, with solid graphite lubricant embedded into the friction surfaces at specific angles and densities. This product combines the load-bearing capacity of metal with the low-friction properties of solid lubricants, enabling long-term, stable operation in oil-free or low-oil environments. It is widely used in industrial applications where conventional oil film lubrication is difficult to achieve, such as in heavy-load, low-speed, high-temperature, and dusty environments.
 

二．Available materials：

High-hardness, wear-resistant high-strength brass is generally recommended.

三.Performance Characteristics

1.Self-lubricating and maintenance-free: No external lubrication system is required, significantly reducing equipment maintenance costs and the risk of environmental pollution

2.Excellent wear resistance: Graphite forms a solid lubricating film on the friction surfaces, effectively reducing journal wear

3.High load-bearing capacity: The copper alloy matrix can withstand impact and vibration loads

High-temperature and chemical corrosion resistance: Suitable for harsh operating conditions such as high-temperature furnaces and kilns, as well as acidic and alkaline environments

4.Excellent anti-seizing performance: Prevents dry friction and seizing between the shaft and bearing under oil-deficient conditions

四．Product Applications

五.FAQ:

Q1: Do graphite-copper bushings require absolutely no lubrication?

Under most low-speed, light-load conditions, graphite-copper bushings can achieve fully dry-friction self-lubrication. However, under heavy-load, high-speed, or frequent start-stop conditions, it is recommended to apply a small amount of grease periodically to extend service life, with graphite serving as a backup lubricant in such cases.

Q2: How does the service life of graphite-copper bushings compare to that of standard copper bushings?

Under dry-running conditions, the service life of graphite-copper bushings is typically 5–10 times that of standard copper bushings. Under well-lubricated conditions, standard copper bushings may have a longer service life, but graphite-copper bushings offer higher operational reliability.

Q3: What are the surface hardness requirements for the shaft?

It is recommended that the mating shaft have a surface hardness of ≥ HRC 45 and a surface roughness of Ra 0.4–1.6 μm. The higher the shaft hardness and the smoother the surface, the lower the wear rate of the graphite-copper bushing.

Q4: Are graphite-copper bushings suitable for seawater or humid environments?

Standard high-strength brass substrates are suitable for general humid environments. If the bushing will be immersed in seawater or highly corrosive media for extended periods, it is recommended to use an aluminum bronze (CuAl10Fe3) substrate or apply surface anti-corrosion treatment, and use SL4 as the solid lubricant.

Q5: What precautions should be taken during installation?

Graphite-lined bronze bushings are typically pressed into the bearing housing using an interference fit; direct impact on the graphite-lined area is strictly prohibited. The inner bore should be machined with a 0.2–0.5 mm scraping allowance. After installation, perform precision reaming or scraping according to the shaft diameter to ensure an assembly clearance of 0.05–0.15 mm.

Q6: Can the product be customized?

Yes. We support customization of the inner diameter, outer diameter, length, graphite embedding density, base material, and oil groove structure based on customer drawings. Common standard sizes are kept in stock; the lead time for non-standard customization is typically 7–15 business days.

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