Metallic suspension bushings, with their core advantages of high load-bearing capacity, excellent wear resistance, and a wide temperature tolerance range, are suitable for a variety of demanding operating conditions involving heavy loads, high temperatures, high friction, and stringent requirements for positioning accuracy. The characteristics of different metallic materials—such as carbon steel, stainless steel, and copper alloys—differ and correspond to specific application scenarios, which are categorized as follows:
Carbon steel materials (45# steel, alloy structural steel)
Applicable scenarios: Heavy-duty connections for construction machinery, industrial lifting equipment, and embedded lifting loops for construction.
The core reason is that after quenching, carbon steel can achieve a hardness of HRC40–55 and a tensile strength of ≥600 MPa, enabling it to withstand heavy impact loads and frequent oscillations. This makes it well-suited for heavy-duty applications such as crane boom pins, excavator bucket rod connections, and tower crane lifting rings.
Key points to note: Carbon steel has poor corrosion resistance and requires galvanizing, chrome plating, or blackening treatment. It is suitable only for dry indoor and outdoor environments free of acidic or alkaline media.
Stainless steel material (304/316 stainless steel)
Suitable applications: Lifting components for marine engineering, chemical equipment, and the food and pharmaceutical industries.
The core reason is that 304 stainless steel possesses basic corrosion resistance and can withstand humid and salt-spray environments. 316 stainless steel, on the other hand, contains molybdenum, giving it enhanced resistance to acids, alkalis, and chloride ion corrosion. It is particularly suitable for applications such as lifting equipment in ports, lifting rings for chemical reactors, and lifting components in food production lines—helping to prevent bushings from rusting and contaminating the medium or equipment.
Additional advantage: Wide temperature resistance range (-200℃ to 600℃), also suitable for lug connections in low-temperature freezing equipment or high-temperature baking equipment.
Copper alloy materials (brass, bronze)
Applicable scenarios: Low-speed, heavy-load connections for precision machinery, high-precision positioning equipment, and oil-free lubrication conditions.
The core reason: Copper alloys inherently possess excellent self-lubricating properties, with a coefficient of friction ≤ 0.2, eliminating the need for additional lubricant addition and thus avoiding oil contamination. At the same time, they exhibit outstanding thermal conductivity, enabling rapid dissipation of frictional heat and preventing seizing and jamming.
Typical applications include: precision machine tool lifting eye pins, bogie lifting eyes for rail transit vehicles, lifting components for medical devices, and precision connections for military equipment—these applications not only meet medium-load requirements but also ensure high coaxiality accuracy between the lifting eye and the pin.
Highly Compatible Common Scenarios
High-temperature conditions: Lifting of steelmaking furnaces in the metallurgical industry, lifting rings for boiler equipment, and connections for high-temperature kiln components—these metal materials can withstand a temperature range of -20℃ to 600℃ with minimal degradation in mechanical properties at high temperatures.
In rigid connections where there are no requirements for vibration damping—such as fixed lifting eyes for heavy-duty equipment or load-bearing lifting eyes in steel-structure buildings—the rigidity of metal bushings can ensure connection stability and prevent load shifts caused by deformation.
Warning: The metal bushing lacks shock-absorbing and cushioning capabilities and is therefore unsuitable for use in automotive suspension systems or as lifting lug connections for high-frequency vibration equipment. Otherwise, it may accelerate wear on mating surfaces and generate significant noise.