Dubro HD Bolt with Lock Nuts 4-40x1 Tool - DUB178

The Dubro DUB178 is a set of 4-40 x 1 inch socket head bolts with matching lock nuts, designed for use in RC aircraft builds and repairs. Dubro hardware is a trusted staple in the RC aviation hobby, and the 4-40 thread size is one of the most commonly used fastener standards in RC airframe construction. These socket head bolts provide a secure, reliable fastening point wherever precise mechanical connections are needed on a model aircraft.

Key Features

• 4-40 x 1 inch socket head bolt specification — a standard thread size widely used in RC aircraft hardware
• Lock nuts included to prevent fasteners from backing out under vibration during flight
• Socket head design allows tightening with a hex key for better torque control in tight spaces
• Suitable for use in control linkages, servo mounts, landing gear, and general airframe assembly

What's Included

• 4-40 x 1 inch socket head bolts
• Matching 4-40 lock nuts

What You Need

• Appropriate hex key or Allen wrench to fit the socket head bolt drive size