Hillman 10 Pcs Expansion Well Nuts (1/4"-20 x 3/4") | Rubber Well Nuts with Embedded Steel Thread Insert | Leakproof Blind Fasteners for Panels, Marine Hardware, Automotive & Equipment Mounting

Product Description Hillman expansion nuts provide a convenient fastening solution for applications that require secure installation in blind holes or closed-end materials. These fasteners are commonly used when access to the backside of the material is not available, making them ideal for panel mounting, equipment installation, and various repair tasks. Each expansion nut consists of a rubber body combined with a threaded metal insert. When a bolt or screw is tightened into the insert, the rubber portion compresses and expands behind the mounting surface. This expansion creates a secure grip that helps hold the fastener firmly in place. The expanding rubber body also creates a leakproof seal around the bolt hole, helping prevent water or moisture from passing through the installation point. This makes expansion nuts useful in applications where sealing and vibration resistance are important. Designed for compatibility with 1/4"-20 USS coarse thread bolts or screws, these expansion nuts provide reliable fastening performance in a variety of mounting applications. They are commonly used in equipment mounting, panel fastening, automotive components, marine installations, and general repair projects. The rubber construction helps absorb vibration and protect surrounding materials from damage during tightening. This combination of sealing, vibration resistance, and secure holding strength makes expansion nuts a versatile fastening option for many installation tasks. Packaged in a convenient refill box containing 10 expansion nuts, these fasteners are ideal for contractors, installers, maintenance professionals, and DIY homeowners working on equipment installations, panel mounting, and blind fastening applications. From the Manufacturer An expansion or well nut consists of a flanged neoprene bushing with a threaded nut embedded in the non flanged end. It is used in blind bolt holes to fasten a piece and seal the bolt hole. The nut is inserted into the hole flange side up, 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
• Included variants range from #6-32 to 3/8"-16 in fine & coarse thread sizes
• Made of high-strength rubber & steel parts
• Corrosion resistance