tapping threads

[Jonno]

Hi,
anyone ever tried to repair the rear of a grille when screws have been broken off in there? I've got the broken screws out (eventually...) but not sure what to do next. Do the threads need re-tapping or are the screws self-tapping (they have a wierd groove in 'em)? What are these things anyway...the parts catalogue calles them 'type G, no.10' Is this a BSP parallel thread?
thanks Jonno

[Glenn 'Stinky' Stankevicius]

After I broke one original screw, I didn't risk the others and just took one in to a fastener shop for stainless replacements. Just used ordinary threaded hex heads.

[Jonno]

I can beat that...I broke a screw extractor in a screw, in the grille (aaaargh)! A very good way to raise the blood pressure...took about half a day to get back to where I was at the start!

[Fast_Eddie]

Jonno,

Are you talking about the die cast vertical and/or the two piece "eyebrow" sections?

The new ones have a hole, no thread, and the bolts are tapered slightly at the end of the thread so that they cut a new thread as they are screwed in.

Not sure of the thread size, however they are not a self tapper per say, however a self tapper replacement would work, especially if you have enlarged the hole.

Regards

Edward

[Jonno]

yeh, those are the ones. The metal does seem pretty soft (unlike my screw extractor!) so I think Ill just try gently easing one back in. If it doesn't cut/hold I'll find something with slightly larger diameter.
thanks for the info.