Could you ever buy
 

Could you ever buy 9/32 or 7mm countersunk machine screws?
looking at the internet I cant find either.

If you know where I could get 3 with nuts, self locking preferably, please do tell.

6mm is a bit sloppy in the hole, 8 will mean drilling

macafee2

Have you tried Screwfix?

far too specialized for them. I'm not even sure if the size was ever available. The screws I have are probably imperial, but I don't know what.
Measuring the diameter of the thread does not match any size.

macafee2

Try these.
 

Try Brabbin and Rudd of Wigan, engineers supplies and very helpful. The number is 01942 242933. Failing that I have a large box of assorted nuts and bolts of various imperial sizes, maybe I can go through them if all else fails.

Try pro bolt , huge range in different materials.

Stan

have you got a set of Zeus charts and a Vernier calliper?

Sounds like they could be imperial if they are a nat's under 8mm. Then count the tpi of the screw (I found on very small screws, it was easier to take a photo of the thread against a ruler and then expand on the screen)

Bit of calculation should tell you what they are.

My best guess is that they are either 1/4" or 5/16" something or other.

I did wonder if they are BA, they 0BA is 6mm o/d so unlikely to be that.

thank you for the replies, I will look into this again tomorrow afternoon

macafee2

I have a few 7mm nylocs somewhere if it helps FOC.

Have a search for 9/32" UNF, they do exist and are used for things like model making and the legacy aircraft industry.