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A detailed discussion on the method of distinguishing the authenticity of NSK bearings
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Second, look at the packaging: posing as "NSK" brand bearing outer packaging and the genuine "NSK" brand bearing outsourcing is equipped with slender differences; the "NSK" trademark on the right side of the box is red and black; and the genuine "NSK" "The trademark is in white and black. The NSK bearing from the bearing appearance is usually more than the carton packaging, the color of the carton is dark blue; and the type of bearing printed on it is very clear to use the NSK anti-counterfeiting skills. And the fake bearing is very difficult to do this. The color of the dot box is lighter and very simple. The bearing type font is also vague. Listening to static: Can there be noise: the left hand grasps the bearing body sleeve; the right hand pushes the jacket to make it rotate; listen to whether it can have noise. Because the production conditions of most counterfeit products are backward; in the production process, it will inevitably be mixed with impurities; hidden in the bearing body; so the noise will be announced during the rotation.
Fourth, the chamfer can be even: the so-called bearing chamfer; that is, the intersection of the horizontal and vertical; the counterfeit bearing because of the constraints of production skills; in these corners and corners of the disposal is not satisfactory.
Five, the price: NSK bearing price is of course much higher than the price of domestic bearings; want to buy NSK bearings at the price of domestic bearings is definitely fake.
There are also several ways to distinguish between authenticity in its application:
The radial ball bearing with normal skill condition; the inner and outer ring raceways should have no falling off and severe wear marks; and a circular arc groove with bright light, all the balls should adhere to the round shape; the surface is free from mottle, crack and fall off, Adhere to the frame is not slack, not broken, not worn. When using a hand-held inner ring; the other hand agilely pushes the outer ring to rotate; the demand rotates smoothly; only the fine movement of the ball rolling on the raceway is heard; no oscillation When the suspension is stopped, the speed should be gradually reduced; after stopping, there is no backward appearance; the normal centripetal ball bearing; the gap between the inner and outer rings and the rolling body is 0. 005-0. 010 mm; when the inner and outer rings are swayed in the radial direction; Should feel the gapless. Used bearings; can hold the inner ring by hand to shake a few times in the axial direction; when the outer ring and the ball have significant movement; clarify that the cooperation gap exceeds 0. 03mm; should not continue to use .
After the use of the tapered bearing in the NSK bearing, the bearing should be seen; whether the rolling frame and the inner ring raceway can be peeled off; whether the frame can be too loose; whether the inner ring can be intact; whether the outer ring raceway can be Crack. After the inner ring and roller assembly are installed in the outer ring; the roller should fall into the center of the raceway; the forward displacement does not exceed 1. 5mm. One of them is unqualified;
Determination of Spherical Roller Bearings and Short Cylindrical Roller Bearings in NSK Bearings The outer ring of such bearings is separable. Under normal conditions; the inner and outer ring raceways and rollers should be free of breaks, pitting and deep Wear marks, adhere to the frame should be free of deformation and can gather the roller on the inner ring, the cooperation gap between the inner and outer ring raceway and the roller should not exceed 0. 06mm.
When the thrust ball bearing of NSK bearing is judged to be in normal condition; the two raceways should have no falling damage and severe wear; the ball should be free from breakage and pitting, and the frame should be free of deformation; it should not touch the two raceway washers; Gather together.
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