自钻自攻螺钉的常规材质为渗碳钢或热处理钢。性能标准执行GB/T3098.11(ISO 10666)。自钻自攻螺钉的产品执行标准见下表:

自钻自攻螺钉头部形状

自钻自攻螺钉依据标准有多种头部形式，沉头、半沉头、盘头、开槽六角凸缘、六角头法兰、六角头凸缘，见以下示意图：

Q: 为什么自钻自攻钉头型没有外六角?

主要原因是外六角型的头部受力面积大，可以承受较大的安装扭矩，而自钻自攻螺钉安装时要靠螺纹的”尖尾巴“自行钻孔，在电动安装工具高速安装时很可能因为超扭导致螺钉头部断裂。因此，将自钻自攻螺钉的头部形式设计成六角法兰或六角凸缘，法兰和凸缘的接触面积更大，螺钉安装到位时更容易发现并及时停止施加扭矩。

扳拧结构

扳拧结构是为了实现螺纹连的装配,保证螺钉顺利安装的受力结构,可分为外扳拧结构和内扳拧结构。下图是自钻自攻螺钉常见的扳拧形式，其中十字槽、米字槽均属于内扳拧结构，六角头属于外扳拧结构，而开槽六角头则兼顾了外扳拧和内扳拧结构。

开槽六角头	十字槽	米字槽	六角头

Q: 为什么自钻自攻钉没有开槽扳拧结构？

这是因为自钻自攻螺钉需要钻孔，为了保证电动安装工具高速安装，自钻自攻螺钉的扳拧结构必须能够承受较大的冲击力，单独的开槽型扳拧结构定位点和受力面积较小，极易在高速安装中出现工具滑脱或者螺钉损坏，既不安全又影响装配效率。

Drilling, threading, screwing-in - all in one work step

Therefore considerably reduced time and effort

Exact drilling diameter for each screw connection

• Resulting in minimisation of thread tolerance
• Always an optimum connection
•  

Prevents installation errors

AW drive system:

• Enhanced torque transmission
• Longer service life
• Optimum centring
• Better mounting output thanks to fatigue-free screwing in; the required contact pressure for transmission of the torques is considerably lower
• Largest possible contact surface of bit in screw drive
• Even force distribution prevents damage to the surface-protection coating and therefore ensures better resistance to corrosion
•  

Notice

Contact pressure during use approx. 100 N, screw in with depth stop if necessary

Galvanized drilling screws may only be used where dampness is not to be expected. For fasteners with a construction approval, the approval, and in particular Part 2 "Special regulations", must always be observed.