Conquest 2-1/2″-4 Grade C NU Heavy Nylon Insert Locknut – Plain
The Conquest 2-1/2″-4 Grade C NU Heavy Nylon Insert Locknut is a high-strength, large-format fastener built for structural stability in high-vibration, heavy-load environments. Featuring a coarse 4 TPI thread and a heavy-pattern design, this nut provides strong thread engagement, while the nylon insert delivers vibration-resistant locking without damaging the mating threads or requiring extra components like washers or adhesives.
Heavy-Pattern Locknut for Framing, Baseplates, and Indoor Equipment Installations
Manufactured from hardened Grade C carbon steel and finished plain, this locknut is ideal for dry indoor applications where corrosion isn’t a concern. The oversized profile enhances load distribution, making it suitable for securing columns, anchoring large HVAC structures, or assembling indoor equipment platforms. The nylon insert friction-locks onto mating threads, minimizing the risk of loosening in critical connections over time.
Key Features
- Nylon Insert: Provides locking power by increasing resistance to thread rotation.
- Heavy-Pattern Strength: Built from Grade C steel for durability and torque tolerance.
- Thread Type/TPI: Coarse 4 TPI for quick engagement and secure hold in heavy-duty connections.
- Plain Finish: Designed for non-corrosive, indoor structural environments.
- Oversized Fastening: Made for 2-1/2″-4 threaded bolts and rod.
Applications
- Structural equipment platforms and baseplates
- Indoor HVAC systems and mechanical supports
- Industrial bracketing and framing systems
- Heavy-duty enclosures and machinery retrofits
- Any vibration-prone application requiring a secure hold
Installation Tips
- Start threading by hand to preserve the nylon insert.
- Use torque tools rated for oversized fasteners to secure properly.
- Ensure mating bolt threads are clean and match 4 TPI pitch.
Related Items:
- A307 Hex Bolts
- A307 Threaded Rod








