Shenzhen Chuanggu Screw Zhu Manager introduced the basic knowledge of combination bolts.
The combination bolt is called the outer hexagon combination screw. There are two kinds of national standard. One is the cross recessed hex combination bolt. The national standard is GB9074.13. The other type is the combination bolt without cross recess. We call it a trimming hex combination bolt. Of course, the combination bolts are divided according to the material, and there are iron and stainless steel "target=_blank> stainless steel. The iron has a grade strength of 4.8 and 8.8.
The process of assembling the bolts is to first punch out the hexagonal bolt piers, and then put the flat washers on the manual or automatic padding machine. After the tooth decay. If the number is too large, use an automatic padding machine. If the number is too small, the workers usually wear a flat pad. Of course, the flat washers used in the combination bolts are generally used for combination screws. Other commonly used spring pads, flat pads used to make combination screws are not acceptable. So many are custom-made flat pads. The choice of the spring pad is very important. To choose a good spring pad, a material like Mn65 is good. A bad spring pad combination on the combination screw can easily break off, or it can be pressed down and cannot be played.
The electroplating of the combination bolts is environmentally friendly and non-environmental, which is common. The combination bolts are commonly used in environmental protection plating, such as environmentally friendly color zinc, environmentally friendly blue zinc, environmentally friendly white zinc, environmentally friendly nickel, etc., and the combination bolts are not environmentally friendly, such as colored zinc, white zinc, black zinc, white nickel and the like.
The salt spray test time after the combination of screw plating, like the production of our company's Shenzhen Chuanggu screw, the general environmental protection color zinc, environmentally friendly blue zinc can be salt spray for 72 hours, the environmental protection white zinc salt spray is relatively poor, only 6 -8 hours. Ordinary non-environmental combination screws are also relatively poor, generally less than 10 hours.
The above original source creates a solid combination screw network:
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