A completley random question about the SUSAT

Does anybody know what size locking nuts the SUSAT uses?

Completley random I know, but the thread is going on my issued ones and I cant get new until they actually bust (which will probably be on operations!)
Drkhrs, you need to get the right nut from your Armr, you will find it difficult to get the right nut from a hardware shop. Ask and they should sort the problem, you could even report it as a fault for them to fix?

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