Whether the outer packaging is clear: Typically, factory brands employ their own dedicated designers to create the outer packaging. These designs are produced under controlled factory conditions, ensuring clarity in every detail—from the lines to the color blocks. The packaging is well-defined and unambiguous. Some imported brands also feature unique accessory designs that not only enhance aesthetics but also serve as a form of intellectual property protection.
Whether the steel printing is clear: Brand names, labels, and other essential information are usually stamped directly onto the bearing surface. Although the font size is small, factory-produced bearings typically use stencil technology, where the text is pressed before heat treatment. This results in deep, sharp, and highly legible characters. In contrast, counterfeit products often have blurry or faded text due to inferior printing methods. Their fonts tend to sit on the surface rather than being etched, and some can even be wiped off with your fingers.
Is there any noise when rotating? To check this, hold the inner race of the bearing with one hand and rotate the outer race with the other. Listen carefully for any unusual noises. Most counterfeit bearings are produced without proper machinery and often involve manual processes, which can introduce impurities like sand into the bearing components. These contaminants cause noise during rotation. This is one of the most noticeable differences between genuine factory-made bearings, which are produced under strict quality control using automated systems, and fake ones.
Is there any oily residue on the surface? This is especially important when purchasing imported bearings. Domestic anti-rust technology may not be as advanced, leading to thick oil residues that feel sticky when touched. In contrast, imported bearings typically have minimal or almost invisible rust-preventative oil. If you detect a strong oily smell, it's likely anti-rust oil, though it may not be visible to the naked eye.
Are the chamfers uniform? The chamfer refers to the rounded edge where the flat surfaces meet. Counterfeit bearings often fail to achieve consistent chamfers due to limitations in their manufacturing processes. Genuine bearings, on the other hand, are precisely machined to ensure smooth, even edges, reflecting the high standards of professional production.
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