track fasteners include a number of types, mainly to play a tightening role. It is also widely used in production and life, but there will also be some defective products in track fasteners, especially on the surface, there will be some defects, as described below. 1, a dent, a dent is a shallow pit or depression on the surface of the bolt or screw due to the metal not being filled during forging or upsetting. A dent is a mark or impression caused by chips or cut burrs or rust layers of raw materials and fails to be removed in a forging or upsetting process. 2, shear burst, in the forging process may produce shear burst, such as the round head or flange product, or the circumference of the flange, usually about the product axis line. Shear bursting may also occur on the opposite side plane of the hexagon head product and is permitted within a certain range. 3. Forging cracks. Forging cracks may occur during cutting or forging processes, and the length, depth, or width of the cracks on the top surface of the head of bolts and screws is allowed within a certain range. 4, wrinkles, wrinkles are the metal folding that appears on the surface of the fastener during the forging process. In the upsetting process of a shock due to insufficient volume and shape caused by the displacement of the material caused by wrinkles at or below the bearing surface of the inner corner wrinkles are not allowed to exist on the outer corner wrinkles are allowed.

track fasteners https://www.hbrailwayfastening.com/