Self Tapping Screw Size

[topgazza]

Im getting myself confused by screw sizes. I have fitted a new element to my oven but the old screws holding the cover in place are corroded. They appear to be flanged screws with a torn head. Approx 12mm long and thread diameter is 6mm. So short and fat.
I just can't find anything of that size and the various type in metric or imperial don't help. Are they size 6 ? Most size 6s are really long
Any help appreciated

 

[blup]

6mm is 6mm. No.6 is approx 3.5mm. The length is for the threaded part only, unless countersunk.

Search kays fasteners on ebay which has a wide range, and other suppliers will also come up to give a comparison.

Blup

 

[topgazza]

Thanks for that I will check them out. I think no 12 is around 5.5 to 6mm diameter of thread.
Much appreciated