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Is there a trend that the fastening way of bolts has changed from word to cross and to six angles inside?

The fastening of bolts has gone through several stages. The most original way is the external six corners, which is tightened and loosened by wrench. The defect is that the wrench has large rotation radius and is difficult to tighten or loose in some narrow areas. With the wider application of bolts, the use of some small places makes the head of the bolt small, so the way of fastening the screwdriver (common cones, screw cones, etc.) appears. But the defect is also obvious, because the gap between the tool and the bolt is very large, it is easy to screwed "rotten" (in fact, the groove of a word is unscrewed, but unable to force). The modern mass line processing method makes the bolts of the cross head appear, which is convenient for the use of large-scale pneumatic and electric tools. It has good fault tolerance, but it also has its defects. It is also easy to screw down the center of the force.  Then the bolts with six corners outside the skirt were stopped, and the bolts were fastened and loosened with the special t-socket wrench. The most obvious application is on motorcycle engines. Because of the decorative considerations (the six corners can sink under the surface of the object), the six corner bolts can be used in large quantities. In the past, there were not enough fields in the field of black appearance. The internal six - horn bolt is a special tool to fasten and loose, and the model is not used (the relative tool and the inner six angle gap is relatively small), so that the angle of the six angles in it will not be destroyed. Besides, the hexagon is most uniform under the condition of effective inner diameter, that is to say, it can bear greater torque. No matter tools or bolts, quality is the most important.

Contact person: Ms. Nancy Yue