Hillman 10 Pack Expansion Nuts (1/4"-20 x 1") | Rubber Well Nuts with Steel Insert | Blind Hole Fasteners for Sealing Leakproof Mounting Automotive Marine Applications

DESIGNED FOR BLIND HOLE FASTENING APPLICATIONS: Ideal for blind or closed-end holes, providing secure fastening for automotive, marine, and repair applications where back access is limited.

EXPANDING RUBBER DESIGN FOR SECURE HOLD: Features a neoprene rubber body that expands when tightened, creating a firm grip and improving holding strength, reducing loosening in vibration-prone or dynamic applications.

LEAKPROOF SEALING PERFORMANCE. Expands to seal around the bolt hole, preventing water, air, or debris from passing through, ideal for moisture resistance in outdoor and enclosed installations.

1/4"-20 COARSE THREAD COMPATIBILITY. Equipped with a steel insert featuring a standard 1/4"-20 coarse thread, ensuring compatibility with bolts and threaded rods for reliable fastening performance across various applications.

TRUSTED HILLMAN FASTENING SOLUTIONS. Hillman hardware is engineered for quality, reliable performance, and easy use in construction, repair, and home improvement. Trusted by professionals and DIYers for consistent results in everyday projects.