What's this drill bit for??

[Coolhurst]

Left behind at my place by a tradesman many moons back. Can anyone tell me what its use is?

Basically a drill bit housed within a retractable cover. Countersink?

[ATT]108403[/ATTACH]

 

[big-all]

i dont know but assume countersink by the shape off the outer sleeve
and rather than pilot a shank hole as its to large for a pilot as it would remove all material

 

[rsgaz]

It's a self centering pilot bit for drilling exactly in the middle of a hinge hole.

Gaz

 

[big-all]

It's a self centering pilot bit for drilling exactly in the middle of a hinge hole.

Gaz

ahh that makes sense so the sleeve doesnt turn then ??
it just locates in the hinge countersink ??

 

[magicmushroom666]

Its a drill guide:

 

[rsgaz]

rather than pilot a shank hole as its to large for a pilot as it would remove all material

It is a pilot, just a very large one, maybe for a number 12 screw, which is probably why the tradesman never came back to retrieve it, probably never uses it and never realised he had lost it!

Coolhurst, can you see a number engraved on it anywhere?

Gaz

 

[rsgaz]

ahh that makes sense so the sleeve doesnt turn then ??
it just locates in the hinge countersink ??

Correct, it's free to rotate, ie, doesn't rotate in use! They get really, REALLY hot!!!

Gaz

 

[big-all]

It is a pilot, just a very large one, maybe for a number 12 screw, which is probably why the tradesman never came back to retrieve it, probably never uses it and never realised he had lost it!

Coolhurst, can you see a number engraved on it anywhere?

Gaz

most door and window furniture tend to be no7s

 

[Deleted member 174758]

We call them Vix bits. They only get hot in use if you don't clear them out (of swarf) and don't lubricate them (oh, and if and they are cheap Chinese copies). The Trend Snappy versions are a million miles better than cheap and nasty Chinese copies illustrated. And, B-A, most modern fire door hardware requires 4.5 or 5mm screws, not #7s!

 

[rsgaz]

oh, and if and they are cheap Chinese copies

That's the ones I've got! Cheap chinese crap is fine for my extremely occasional use.

 

[big-all]

We call them Vix bits. They only get hot in use if you don't clear them out (of swarf) and don't lubricate them (oh, and if and they are cheap Chinese copies). The Trend Snappy versions are a million miles better than cheap and nasty Chinese copies illustrated. And, B-A, most modern fire door hardware requires 4.5 or 5mm screws, not #7s!

i bow to you up to date active knowlage as always
most people dont even realize no7 screws exist never mind most older furniture use it

 

[Deleted member 174758]

You ought to see the size of screws that came with some 6in bronze bank Parliament hinges we removed last year. I reckon the screws must have been #14 or #16 and about 4in long. Bit big for a Vix bit, however

 

[Coolhurst]

Thanks all. That adds up as we had doors fitted a few months ago so I now know who's bit it is!

Gaz - to answer your Q, it's states #12 on the side.