Dubro Nylon Insert Lock Nuts 4-40 Tool - DUB170

The Dubro DUB170 4-40 Nylon Insert Lock Nuts are a pack of four stainless RC hardware fasteners designed to secure threaded connections on RC aircraft builds and repairs. The nylon insert grips the thread and prevents the nut from backing off under vibration, which is a common cause of loose linkages and control surface failures in fixed-wing models. These 4-40 size lock nuts are a standard fastener used widely across RC aircraft hardware setups, making them a straightforward replacement or stock item for any builder's or repairer's kit.

Key Features

• 4-40 thread size — a widely used standard in RC aircraft linkage and hardware setups
• Nylon insert locks the nut in place and resists loosening caused by engine or motor vibration
• Pack of four provides enough hardware for multiple connection points in a single build or repair
• Small, lightweight fasteners that add minimal weight — important in RC aircraft applications
• Suitable for use wherever 4-40 threaded hardware is specified in an aircraft build

What's Included

• 4 x Dubro 4-40 Nylon Insert Lock Nuts

What You Need

• Appropriate 4-40 threaded rods, bolts, or linkage hardware to pair with these nuts
• Basic hand tools for installation (pliers or small spanner)