双螺纹自钻尾喇叭头自攻螺丝的工程标准

双螺纹自钻尾喇叭头自攻螺丝
　　（Twin Lead Self Drilling Point Tapping Screws) ─组装时可以轻易旋入乾墙，在钢铁牙条上自钻一洞并攻出配合之阴螺纹.其喇叭头具凹入之承受面可以在旋入时不至于破坏到壁纸或石膏表面.大多数之自攻螺丝均属于商业用途，例如当自攻螺丝以组合螺丝（SEMS）提供时，可以提供更紧密之服务.而螺丝如具有粗细螺纹特殊设计者则系著眼于组装后之防松.

 工程标准
　　
自攻螺丝之尺寸，机械性，功能性能有下列标准： 　　
ANSI/ASME B18.6.4─Thread Forming And Thread Cutting Tapping Screws And Metallic Drive Screws (Inch Series) 　　
SAE J933─Mechanical and Quality Requirements For Tapping Screws 　　
SAE J81─Thread Rolling Screws 　　
SAE J1237─Metric Thread Rolling Screws 　　
SAE J78─Steel Self-Drilling Tapping Screws 　　
FIP 1000─Tapping Screws Performance Specifications 　　
DIN 7500─Thread Rolling Screws For ISO Metric Screws Thread 　　
DIN 7504─Self-Drilling Tapping Screws Dimensions,Requirements And Testing 　　
ISO 2702─Heat-Treated Steel Tapping Mechanical Properties 　　
JIS B1055─Mechanical Properties For Heat-Treated Steel and Stainless Tapping Screws
 

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