Bi-metal Spiral Point Self-drilling Screws

Bi-metal Spiral Point Self-drilling Screws

Stainless steel such as A2 or A4 grade has outstanding anti-corrosion properties, but not a good material to serve as a tool and drill a hole. In contrast, carbon steel can be hardened but poor in chemical resistance.This is why Sun Through put them together to cover each other's weakness.
"A chain is only as strong as its weakest link." This saying perfectly points out the difficulty of this product. If the drilling point isn't designed properly, the bonding point breaks easily, no matter how hard the drilling tip is.
The smooth flutes of the spiral point dramatically lower friction of chip removal, and users are no longer worried about the weakest link.

                                         Carbon Steel or SS410
Drilling point size Q5 Q6 Q7  Q8 Q9 Q10
Drilling capacity  12mm 15mm 18mm 21mm 25mm 30mm
Nominal size customized from M5.5 to M8.0 (#12 to #14 above)
Length customized from 38mm~350mm
Material C1018/C1022/SS410      
                                            Bi-metal                                                        
Drilling point size Q5 Q6 Q7  Q8 Q9  
Drilling capacity  12mm 15mm 18mm 21mm 25mm  
Nominal size customized from M5.5 to M7.0 (#12 to #14 above)
Length customized from 38mm~350mm
Material A2/A4  Steel Alloy

*** specifications can be customized, contact us for specific specs***