At present, Europe and the United States are still the main aerospace markets, and there is a high demand for high-end fasteners. The Asia-Pacific region is affected by the rapid economic and industrial development of emerging economies represented by China. The aerospace industry has developed rapi

自攻自钻螺丝使用教程SAE 」78标准规定了一般用途碳钢自攻自钻螺丝钉的尺寸技术要求，也包括性能要求，标准的目的是要使符合规定机械性能要求的碳钢自攻自钻螺丝钉在装配中，能钻出孔并同时成形或切削出与自身相连接的螺纹，而螺钉自身螺纹不产生变形和脱扣。

In 29th, President Xi Jinping met with US President Trump in Osaka. The two heads of state exchanged in-depth views on the fundamental issues concerning the development of Sino-US relations, the current Sino-US economic and trade frictions, and international and regional issues of common concern, an