•  maintenance-free operation
• very good frictional properties
•  high load capacity
•  high sliding velocity
•  small operating clearance
• Long service intervals
• Low friction coefficient
• Wide range of use
• Long lifetime

Type of application

• Hydraulic cranes
• Hydraulic cylinders
• Agriculture machines
• Hoisting equipment

Self-lubricating Bushings (metric)

The Development  Composite bushes

In the past, nylon bearings or copper – tile bearings were used in hydroelectric power equipment.These bearings have many disadvantages, such as the water absorption and expansibility of pure nylon bearings, increase the size of the unstable factors, easy to appear the phenomenon of axle, which brings a hidden danger to the actual operation of the power station. On the one hand, copper tile bearings need dry oil lubrication, high cost, complex process, is not conducive to environmental protection;On the other hand, the bearing capacity is low and the extrusion stress is high. Only by increasing the axial diameter size of the body parts can the compressive stress of the bearing bush be reduced, which is bound to cause the waste of the material of the body parts of the power generating equipment.

Applications in large hydraulic power generation equipment

Composite bushes has many excellent properties, such as low friction and low wear, no matter in water lubrication or in friction state. It should be widely used in large hydraulic power generation equipment.For example, on the water turbine guide mechanism, in the middle, lower guide vane bushing, control ring rod pin bushing, rotating impeller bushing, control ring anti-wear plate and large and medium-sized ball valve and butterfly valve on the valve shaft bushing have been widely used

Material and surface finish of counterfaces

The factors that are most important to consider when selecting the material and surface finish of the counterface (the surface on which the bearing slides) are the loading conditions (load, angle of oscillation, type of movement etc.) and the environmental influences.
Where there is a risk of corrosion, the counterface should be sufficiently resistant. Corrosion scars in the counterface and the by-product of corrosion (particulate contamination) increase the surface roughness and are abrasive and will accelerate wear. In these cases, the use of stainless steel or a surface treatment such as hard chromium, nickel plating or electrolytic oxidation should be considered.
For PTFE composite and POM composite plain bearing arrangements, soft carbon steels with a ground surface are usually adequate for the counterface. The surface roughness Ra (to EN ISO 4287:1998 and
EN ISO 1302:2002) should not exceed 0,4 μm for PTFE composite bearings and 0,8 μm for POM composite bearings. The corresponding Rz values are 3 and 6 μm, respectively. For more demanding applications the use of a hardened counterface is recommended. These should have a surface hardness of at least 50 HRC. Alternatively, hard chromium, nickel plating or some other form
of surface treatment can be considered. In all cases Ra should not be greater than 0,3 μm (Rz ≤ 2 μm). The better the surface finish, the better the running and wear properties .

Design

• Cylindrical bearings
• Flanged bearings
• Thrust washers
• Plates
• Drawing details

Technical information and standard dimensions on the datasheet.