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The poster didn't state a specific brand requirement. Kmoffett suggested Lemo, they're not the only game in town. Digikey sells from a variety of vendors, probably significantly better selection compared to a single brand name.
duffy. Do you think Lemo is the only company that has a small diameter connector that can lock? He didn't state pin requirements size requirements or anything. He stated 'small' generally which has no refrence but from his intetion. We could guess till the cows come home about what might suit his needs but we have no actual information to draw a conclusion of any kind, so it's best to point him at a generic site which has a lot of choices.
The original poster hasn't said anything since his first post so all this suggesting and guesswork is pointless right now. He just said that he needs a small diameter, which is relative, he also didn't specify shape, he said diameter didn't say it had to be round, even square plugs have a diameter =)