德制开槽半沉头自攻螺钉 DIN7973 RAISED COUNTERSUNK HEAD TAPPING SCREWS WITH SLOT 美制开槽半沉头自攻螺钉 ANSI/ASME B18.6.4 1981 SLOTTED OVAL COUNTERSUNK HEAD TAPPING SCREWS IFI H-32(E-28) 公制开槽半沉头自攻螺钉 GB5284-85 RAISED COUNTERSUNK HEAD TAPPING SCREWS WITH SLOT 德制十字槽半沉头自攻螺钉 DIN7983 CROSS RECESSED RAISED CIUNTERSUNK HEAD TAPPING SCREWS 美制十字槽半沉头自攻螺钉 ANSI/ASME B18.6.4 1981 CROSS RECESSED OVAL COUNTERSUNK HEAD TAPPING