内六角螺钉规范

内六角方面，国标有两个版本，一个是GB70-76，76年版，一个是GB70-8585版，我公司现在正在执行DIN912标准，所以要注意实际业务操作上的差异：GB70-85与DIN912完全吻合，所以在新标准的使用上没有区别，主要是GB70-76和DIN912的区别：对于M8系列六角产品，圆头直径GB70-76为12.5MM，小于DIN912的13.27MM。 M10系列内六角产品GB70-76的圆头直径为15MM，小于DIN912的16.27。 M12系列内六角GB70-76的圆头直径为18MM。比DIN912对面18.27小，M16、M20系列内六角GB70-76圆头直径比DIN912小0.33MM，分别为24MM和30MM。 DIN912分别为24.33MM和30.33MM。此外，由于标准不同，旧标准与德标之间的内六角宽度也有所不同。 GB70-76的内侧较小，在业务操作中应注意。

In addition, there are also some differences in the carriage screws that may be used at ordinary times. I will also make an explanation here. In the national standard, there are two standards for carriage screws, namely GB12 (small semicircular head square neck screw) and GB14 (large semicircular head square neck screw) Neck screws), and the German standard DIN603 is usually more commonly used in the market. Now to distinguish these three: for the round head and neck, when comparing the same specifications: GB12. Usually when the carriage screw is used, the head and neck are often required to be large and thick, so the standard of DIN603 carriage screw fully meets the requirements