Dubro 4-40 Blind Nuts Tool (4 Pack) - DUB135

The Dubro 4-40 Blind Nuts (DUB135) are threaded steel inserts designed for installing 4-40 screws into RC aircraft airframes where access to the back of the material is limited or impossible. Commonly used when fitting servos, hinges, and control horns into foam, balsa, or composite structures, these blind nuts allow a secure threaded fixing point without needing a nut on the reverse side. A practical hardware staple for builders working on RC aircraft construction and repairs.

Key Features

• 4-40 thread size suits standard 4-40 screws widely used in RC aircraft hardware
• Installs flush into thin material surfaces where rear access is restricted
• Suitable for use in balsa, ply, foam board, and light composite airframe materials
• Steel construction provides reliable thread engagement for repeated assembly and disassembly

What's Included

• 4 x Dubro 4-40 Blind Nuts

What You Need

• 4-40 screws or bolts (sold separately)
• Suitable installation tool or drill bit for preparing the mounting hole