Hexagon Head Shear Nut Stainless Steel 304 316 Break Away Security Shear Nuts

Description

What is a Shear Nut?

A shear nut is a specialized fastener designed to provide secure clamping force while preventing over-tightening. It features a breakaway design where the top portion (the “hex head”) shears off once a predetermined torque is reached, leaving a smooth, tamper-resistant shank. This makes shear nuts ideal for applications where vibration resistance, security, and controlled tension are critical.

Materials

• Stainless Steel (A2/A4) – Offers excellent corrosion resistance, making it suitable for marine and chemical environments.

• Alloy Steel (Grade 8, 10.9, 12.9) – Provides high tensile strength for heavy-duty applications.

• Titanium – Used in aerospace for its lightweight and high strength-to-weight ratio.

• Aluminum – Lightweight and corrosion-resistant, often used in automotive and aviation.

Surface Treatments

• Zinc Plating – Provides basic corrosion resistance.

• Hot-Dip Galvanizing – Offers superior rust protection for outdoor structures.

• Cadmium Plating – Used in aerospace for its lubricity and corrosion resistance.

• Anodizing (for Aluminum) – Improves wear and corrosion resistance.

• Phosphate Coating – Enhances friction grip and oil retention.

Specifications

• Thread Size: M3 to M30 (metric) or #4 to 1″ (imperial).

• Drive Type: Hex (breaks off after torque).

• Shear Torque Range: Varies by material and size (e.g., 10 Nm to 300 Nm).

• Standards: DIN, ISO, NAS, MS (military/aerospace standards).

Applications

• Aerospace: Engine components, flight control systems.

• Automotive: Wheel assemblies, suspension systems.

• Rail & Transportation: High-speed train bogies, track fasteners.

• Construction & Bridges: Structural joints requiring vibration resistance.

• Military & Defense: Armored vehicles, weapon systems.

Excellent Case: Shear Nuts in Aerospace Landing Gear

One of the most critical applications of shear nuts is in aircraft landing gear systems. Landing gear undergoes extreme stress during takeoff and landing, requiring fasteners that maintain precise clamping force without loosening.

Why choose them?

• Controlled Torque: The breakaway design ensures bolts are tightened to exact specifications, preventing overloading.

• Tamper-Proof: Once installed, the smooth shank prevents unauthorized removal, enhancing safety.

• Vibration Resistance: The nut remains securely locked even under intense vibration.

Implementation:
In the Boeing 787 Dreamliner, shear nuts are used to secure critical landing gear components. Engineers select high-strength titanium nuts with cadmium plating to withstand harsh conditions while minimizing weight. The nuts are torqued to a precise value, after which the hex head shears off, leaving a smooth, secure fastener that won’t loosen mid-flight.

This application ensures maximum safety, reliability, and performance, showcasing why shear nuts are indispensable in high-stakes engineering.