Knowledge

It is mainly used for the connection of smaller parts. There are pan head screws, cylindrical head screws, half countersunk head screws and countersun

Head screws are mostly used after installation, where the surface of the parts cannot be raised, and the fastened parts have two thicknesses. The so-c

1. Appearance quality requirements The appearance of screws is inspected from the appearance, plating layer and other aspects. Second, the inspection

1. The screw head is deformed and the head is skewed. The possible cause is improper installation of the first punch of the screw mold and improper ad

Thread is a shape with uniform spiral lines on the outer or inner surface of a solid. Thread function of fasteners 1. Fastening and connection functio

Contamination during rinsing After the fasteners were quenched, they were cleaned with silicate cleaning agent and then rinsed. XX solid matter appear

Quality considerations (1) The surface rust, oil stains, burrs on the bolt hole wall, welding bead, etc. should be cleaned up. (2) After the contact f

The steel wire is a strong magnetic material, and due to cold drawing and other reasons, the surface permeability is significantly different in differ

1. When lead-fired wire is galvanized, although its strength limit and toughness are weakened, the strength and toughness of hot-dip galvanized steel

1. It depends on the size of the external friction coefficient f in the wire drawing die, because the uneven deformation is caused by the action of ex

1. To properly transfer the measuring wire from the delivery reel to the drum, this is extremely important for the extension characteristics and worki

1. Due to the weight of the steel wire itself, the load is reduced accordingly. 2. A small diameter pulley can be used to lower the steel wire. 3. Sma