On 27 May, 16:19, Martin Bonner wrote:
On May 27, 4:06 pm, bof wrote:



In message , Kevin Poole
writes

bof wrote:
*Anyone tell me the correct definition for the length of a
countersunk *screw that's 5mm long overall, comprising a 3mm threaded
section plus a *2mm deep countersunk head? Is it a 5mm or a 3mm screw,
or even something *else?

5mm

Thanks,

I should have asked originally, is that the same with a pan head too?

For all screw head types, the length is measured to where the surface
of the wood/metal is supposed to go. *This is usually the widest
diameter of the head. *So if you have a round-head screw with 5mm
thread, and a 3mm diameter dome on top, then that's a 5mm screw.
Similarly, consider one of those screws that Wikipedia describes as
oval, and whose real name I can't remember; *a 5mm version would be
3mm thread, 2mm countersinking, and 2mm dome on the top.



They are called "raised head screws".