What type of nut is this?

Franglais:

superscaniaV8:

Wheel Nut 3:
It’s called a DNF fastener.

Do Not Faff [emoji23]

[emoji38]so you think it may be a bugger to get undone?

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One of a range of “anti-tamper” fasteners, designed to stop us playing with things like microwave ovens. If they are reassembled wrongly there is a health risk from leaking microwave radiation.

Not actually going to touch the microwave itself. Just need to move it temporarily. So was hoping to unbolt from the bracket do what needs doing & put it back

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