Boron steel is drillable. Use a TiN coated bit. I needed to mount shelves and had to poke a couple of holes in it. The "no drill zones" are really "no drill mindlessly without regard to what challenges the material or the risks to stuff behind the metal you're drilling will pose zones." Step drills are your friends here.

 

Boron steel is drillable. Use a TiN coated bit.

I killed a couple TiN-coated bits before I realized it was the boron steel that was doing it. Switched to cobalt and busted through in seconds.

 

Thank you,
Greg

 

Is the area surrounding the window area on driver's side behind the driver seat hardened? The BEMM clearly does not identify all hardened areas.

 

Cobalt bits work, too.

 

Use slow drill bit speeds. Do not drill full speed. Using a bit of oil helps too.

 

I am wondering about the area surrounding this wondow. This is just rear of the driver's seat?

 

I am thinking that the front wall portion adjacent the B-pillar is going to be boron. I think the top, bottom, and left side (C-pillar) might be good for screws????

I want to install this wall panel tonight, so I would love some thoughts.

 

I just installed a plus-nut in the upper bend of the window metal. I have low roof and the area is right behind driver’s seat directly under the air bag. Also look at the pic of the US BEMM (in color) and European BEMM (in black in white) having the same view of the door, but the European view has a much better delineation of where the boron items are along the window edge. I used cobalt drill bit without any problem.

 

Happy to report that the area between pillars B and C and below the upper area is mold steel.