Du-Bro 4-40 Nylon Insert Lock Nuts 4pc DBR170
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Du-Bro 4-40 Nylon Insert Lock Nuts are dependable RC fasteners designed to help prevent nuts from loosening under vibration. Each steel nut incorporates a nylon locking insert that grips the mating bolt thread, providing additional resistance against unwanted movement during operation.
Suitable for RC aircraft, cars, boats and other hobby projects using 4-40 hardware, these lock nuts are useful for securing components such as motors, landing gear, servos, control systems and linkages. Du-Bro manufactures the nuts from durable steel with a zinc-plated finish for resistance to wear and corrosion. Each pack contains four 4-40 nylon insert lock nuts.
Features
- Nylon Locking Insert: Grips the bolt thread to help prevent the nut from backing off under vibration
- 4-40 Thread: Designed for compatible imperial 4-40 threaded bolts and hardware
- Steel Construction: Durable metal construction suitable for common RC fastening applications
- Zinc-Plated Finish: Helps provide resistance against corrosion and wear
- Vibration Resistant: Particularly useful on RC models where motors, engines and movement can cause conventional nuts to loosen
- Versatile RC Hardware: Suitable for aircraft, cars, boats and other compatible hobby applications
- Useful Workshop Spare: Handy replacement hardware for repairs, maintenance and custom RC builds
- Four Per Pack: Supplied as a convenient pack of four lock nuts
Specifications
- Brand: Du-Bro
- Manufacturer Part Number: 170
- SKU: DBR170
- Barcode: 011859001704
- Product Type: Nylon Insert Lock Nuts
- Thread Size: 4-40
- Thread Standard: Imperial
- Material: Steel
- Finish: Zinc Plated
- Locking Type: Nylon Insert
- Application: RC Models / Hobby Hardware
- Quantity: 4 Per Pack
Typical Applications
- Motor and engine mounting
- Landing gear installation
- Servo and control system mounting
- Linkages and control hardware
- RC car and boat assembly
- Repairs and custom hobby projects
Includes
- 4 × Du-Bro 4-40 Nylon Insert Lock Nuts
FAQ
What does the nylon insert do? The nylon insert creates resistance against the mating bolt threads as the nut is tightened. This helps stop the nut from gradually backing off when exposed to vibration or movement.
Do I remove the nylon insert before installation? No. The nylon insert is the locking component and should remain inside the nut. Increased resistance when the bolt reaches the nylon section is normal.
What bolts fit these Du-Bro lock nuts? These nuts use a 4-40 imperial thread and should be paired with compatible 4-40 threaded hardware. They are not designed for metric M4 bolts.
Why use a nylon lock nut instead of a standard hex nut? A standard nut can gradually loosen when exposed to repeated vibration. The nylon insert adds prevailing resistance to the thread, making this style particularly useful for moving RC models.
Important Notes
- Package contains 4 lock nuts
- Thread size is 4-40 imperial, not M4 metric
- Use only with compatible 4-40 threaded hardware
- Do not remove the nylon locking insert
- Some resistance when tightening through the nylon insert is normal
- Inspect locking hardware regularly on high-vibration RC applications