Description: Expansion nuts, or well nuts, consist of a flanged neoprene bushing with a threaded nut embedded in the non-flanged end. As the bolt is screwed into the nut, the rubber on the other side of the hole expands and seals the bolt hole.
• Used to seal bolt holes to prevent leaking • Can be used in blind & closed-end holes • Made of high-strength rubber & steel parts • Corrosion resistance • Quality Hillman fastener • These well nuts feature coarse #10-24 screw thread
