Drill bit with Forstner countersink? Does it exist?

[Toecutter]

Sorry for stupid question, but I cannot find this bit or know if it exists.

I want to drill a 10mm hole with a larger flat counter sink to hide a screw. (see example).

I know theres confirmat, and counter drills, but none seem to offer just a flat forstner type counter. Does such a drill bit exist?

Thank you for any advise.

 

[Johnboy]

You won't get a single bit to do that. Just use a standard forstner bit for the counterbore and a 10mm bit for the through hole.

John

 

[Rorschach]

There are drills in that style but finding the right size combo could be very tricky if not impossible. You can grind your own if you like too. If this is only a one off type job though then best to do as mentioned above, use 2 drill bits.

 

[nev]

Have a search for flat bottomed countersink or counterbore

some examples, the wrong size but they MAY do others?
http://www.trend-uk.com/en/ZA/product/6 ... rbore.html
http://www.toolstoday.com/p-5379-flat-b ... -bits.aspx
http://www.woodshopbits.com/Adjustable- ... set120.htm
http://www.ebay.co.uk/itm/TREND-5-8-ADJ ... 1535322494

 

[GLFaria]

+1 for the two drill bit approach. Much less expensive besides.

 

[Toecutter]

Have a search for flat bottomed countersink or counterbore

some examples, the wrong size but they do others?

Thanks nev. I did intend to do quite a few holes so at least I know they do exist. Just got to find a 10mm one

 

[woodpig]

Do a search for 10mm "bullet" drill. Homebase should stock them. It will cut a pilot and the counterbore in one go but you'll then need to drill right through with a bit to suit the screw diameter.

 

[CHJ]

Maybe FAMAG or Colt do one the size you want.

 

[screwpainting]

You could email this guy https://www.youtube.com/watch?v=0vIVSfXg61I and ask him what his special bit is called, this man is a fantastic advert for old school hand skills and tools. The sexy bit he uses in this video may be custom made though??

 

[Bigstinka]

I know you can get them to suit cap headscrews. Can't think what to call them

 

[woodpig]

I know you can get them to suit cap headscrews. Can't think what to call them

For cap head socket screws you normally drill a hole and then use a counterbore for the head. They often come in sets, sometimes with removable pilots. I have several sizes.

If you have lots to do though it's probably worth having a custom bit ground. I've got one in the shed. I'll post a picture if I can find it.

Found it:

The pilot is 9mm and the larger diameter is 15mm and its marked "M8" so I guess it's meant for M8 socket screws. It cost me about £3 at one of the model engineering shows. It's on a MT2 shank.