90 degree countersink bit wanted

[joebloggs]

As it says, want one for both alloy and steel, not going to be used often and ones online seem a little expensive just to leave in the bottom of the tool box. 

Anyone brought a cheapie and was it any good?

[Frosties]

How big does the countersink have to be Joe.


No joy if you used the biggest steel drill bit that'll fit in the chuck?

[celticdog]

I've only got a 82 degree countersink.

[joebloggs]

Hole is 9mm but countersinking a m8 which is about 16.5 diameter. Don't want to use large drill bit as want accurate hole (ocd) may ask engineering at work but have feeling they'd probly use a drill bit as finish not a priority to them

[chris.biker]

 You can sharpen a normal drill to do the job.

[Rob R]

https://www.machinemart.co.uk/shop/product/details/cht530-6pce-hss-countersink-set?da=1&TC=SLI-060235530
not sure that they're 90 degrees though.
Rob

[joebloggs]

https://www.machinemart.co.uk/shop/product/details/cht530-6pce-hss-countersink-set?da=1&TC=SLI-060235530
not sure that they're 90 degrees though.
Rob

Thanks, only thing is I don't want to invest £20 + on tools I'd rarely use again

[YamFazFan]

Car boot sales are an absolute goldmine for tools. If you are prepared to spend a few minutes sorting through boxes you can find some real gems at bargain basement prices .
Saw loads of countersinks at the local one this morning.
Even the second-hand tool dealers who have all the best stuff are a fraction of the cost of buying new.
I rarely buy any tools from the shops any more.