wing nut
wing-nut
wing screw
butterfly nut
thumbnut

He nodded towards a rectangular plastic box secured to the bulkhead by butterfly nuts.

Bond unscrewed the two butterfly nuts and folded the canvas top back behind the seats.

I'm damned if I'll be beaten by a simple butterfly nut, fifty centimetres in front of my nose.

With the old-style spacesuits, reaching that butterfly nut would have been completely out of the question.

But I can see that butterfly nut, underneath the porch grille.

She leaned over it, grasped the butterfly nut in the center, and applied pressure.

Please help me be strong enough to-" This time when she applied pressure, the butterfly nut turned.

She spun the butterfly nut off and let it fall into the engine.

Those armrests could now be removed and clamped out of the way with butterfly nuts.

The helper unscrewed the butterfly nuts that had held the helmet in place.