A Well Nut is a two-part removable fastener consisting of a flanged rubber body, typically made from EPDM neoprene, and a threaded brass insert. Designed for blind fastenings, it only requires access to one side of the hole, making it ideal for applications where the back side is inaccessible.
Originally developed by United Shoe Machinery Company, Well Nuts are made from rubber with a flange at one end and a metal threaded insert inside, usually brass. When a bolt is screwed into the insert, the rubber expands to create a tight, waterproof, and vibration-resistant seal. This makes Well Nuts ideal for use in machinery, mounting engine parts, or other applications requiring a secure, airtight connection.
How Well Nuts Work:
- A pre-drilled hole is required to match the rubber portion of the Well Nut.
- The Well Nut is inserted into the hole with the flange on top, and a bolt is threaded into the brass insert.
- As the bolt tightens, the rubber expands, securing the fastener and creating a strong, vibration-resistant hold.
Installation is simple: insert the Well Nut, align it with the workpiece, and drive the bolt with a washer to prevent spinning during installation.
Key Features:
- Fastens in blind holes
- Seals out moisture
- Reduces noise and dampens vibration
- Resistant to shock
Applications include mounting windshield wiper motors, electric and solar panels, sensors, and radiator systems. Well Nut Threaded Inserts come in various sizes, with body diameters ranging from 6.10mm to 19.05mm and lengths from 0.38mm to 15.42mm.
