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Fastener Library​

Failure Analysis

Fastener Name

Aircraft Bolt

Functionality

Visual inspection for corrosion and thread integrity, torque testing
Secure high-load and high-vibration assemblies in aircraft

Industry Used

Aerospace, defense, aviation

Functional Design

Precision-machined, close-tolerance, often with drilled heads or shanks for safety wiring

Aircraft Bolt

Thread Design

Partially externally threaded
10 - 30 years (depends on cycles)

Lifespan

Corrosion, thread damage, elongation

Signs of Failure

If corrosion, cracks, or stretch beyond limits is found

When to Replace

Follow torque specs, apply safety wire, inspect regularly

How to
Maintain

Visual inspection for corrosion and thread integrity, torque testing

Inspection

Every 6 months

Inspection  Frequency

Analysis

When maintaining aircraft components, it's crucial to monitor signs of wear such as thread wear, elongation, and fretting corrosion. If these issues arise before the part has reached its expected lifespan of 10 to 30 years, it’s essential to take preventive measures. First, ensure the aircraft bolt is not exposed to conditions that exceed specified torque requirements. Apply safety wire as necessary and conduct regular inspections to catch potential issues early. If any corrosion, cracks, or excessive stretching are detected, it's imperative to replace the bolt immediately. Additionally, verify that the correct nut and washer combination is used to ensure proper functionality. For instance, use a self-locking nut and a flat washer with appropriate size and material specifications that match the bolt's requirements. Aircraft bolts are specifically designed for aerospace applications, so avoid using them in non-aerospace environments to prevent unnecessary costs. These bolts perform optimally in flight-critical or vibration-prone assemblies, where their specialized design provides reliability and safety.

Better Alternative

Use corrosion-resistant titanium alloy bolts for enhanced durability

Similar Fasteners

Structural Rivet, High-Tensile Screw

Type of Washer

Flat washer, locking washer

Type of Nut

Self-locking nut, castellated nut with cotter pin

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