平頭焊接螺絲

a) DIN 965 制定了具有十字槽孔 (通常稱為 phillips) 的平頭螺絲標準。這些螺絲通常用於需要平坦表面的應用. 平頭型能使螺絲與材料表面齊平, 從而提供整潔的外觀。

b) 十字槽孔與米字槽孔因其易於使用相容螺絲起子安裝和拆卸而被廣泛使用。此外, 另一常見的六角瓣孔(梅花孔)設計亦可提供更好的扭矩傳遞並最大限度地減少螺絲旋入過程中脫出的風險。

a) ISO 7380-2 訂定了帶有華司的內六角圓頭螺絲標準。通用內六角梅花孔（6 lobe）設計是另一種在各種應用中廣泛使用的常見替代方案。

b) 此螺絲在牙尾末端有一個延伸的圓柱形尖端( 通稱為狗尾 dog point), 其作用為可在對接的部件中做到精確地對準與定位。

a) A self-tapping screw for thermoplastics is a specialized fastener designed to create its own threads as it is driven into plastic materials.

b) These screws have wider, sharp, and deep threads, which allow them to cut into the softer thermoplastic material efficiently, creating a secure, long-lasting hold.

a) 與 DIN 912 不同的是，DIN 7984 螺絲具有薄型頭部且同樣採用六角孔做驅動 (內六角薄頭螺絲), 公制螺紋, 其牙外徑尺寸可從 M3 到 M24

b) DIN 7984 螺絲具有較薄的頭部，因其設計使它們與材料表面齊平。然而，這種設計可能無法提供與 DIN 912 螺絲較厚頭部相同的扭矩傳遞能力，後者由於其較厚的圓柱形頭部形狀而設計用於處理更高的扭矩。 

With small collar around body shank

a) DIN 7500 specifies self-tapping screws for metal, also known as thread-forming screws. These screws are designed to form or cut threads in a pre-drilled hole in metal materials, without requiring a pre-cut thread.

b) The screw shank has a three-lobe shape instead of a round cross-section, which reduces friction during installation, and facilitates smooth material displacement and efficient thread formation.

c) The long dog point (the extended, unthreaded tip of the screw) acts as a pilot, helping to align the screw with the pre-drilled hole during installation, and faciliates smooth installation.

d) A standard trilobe thread forming screw without dog point is avaialble upon request.