Male hexagonal radiator key.

[pgk pgkParticipant @pgkpgk17461]

[pgk pgkParticipant @pgkpgk17461]

All but 2 of my rads have typical square head bleed cocks.. those two I finally got to exmainign with a magnifying glass (old age is no fun) and the blessed things are male hexes.. 3/16 socket too small and 7/32th too big. 5mm too small and 5.5mm too big and I'm out of owned options.

Anyone guess what they really are? 5.2mm or 13/64? Why in the name of the almighty would you choose a wicked size like that????

[Michael GilliganParticipant @michaelgilligan61133]

No idea what size they are supposed to be … but a Flank Drive socket would probably do the trick.

MichaelG.

[mark costello 1Participant @markcostello1]

Whitworth????!!!!!!

[pgk pgkParticipant @pgkpgk17461]

I suspect it's a special size only known to the mystical order of diabolic plumbers and fishplate polishers.. Grr

I suppose a few shreds of ally drink can stuck inside a socket might work or epoxy one on overnight???

[jason udallParticipant @jasonudall57142]

Can’t answer the odd size thing but if you are pushed…cap head screw?…

[jason udallParticipant @jasonudall57142]

And 6 mm dia would yield around 5.2 af

[Gordon WParticipant @gordonw]

Chances are there is paint on the hex. Try a 5/16" socket and a small hammer.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Gordon W on 31/08/2015 09:08:55:

Chances are there is paint on the hex. Try a 5/16" socket and a small hammer.

.

That would be a lot of paint !!

MichaelG.

.

However [pgk] … you might check for a paint-filled screwdriver slot, if the valves are anything like these

[Gordon WParticipant @gordonw]

All right! 3/16" then, or even 5mm.

[Ian S CParticipant @iansc]

BA ?

Ian S C

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