Which of the following is NOT a characteristic of a hi-lok fastener?

• A. It has a threaded shank
• B. It combines rivet and bolt features
• C. It consists of multiple parts
• D. It requires special tools for installation

Answer: (A)

The correct answer identifies that a hi-lok fastener does not have a threaded shank. Hi-lok fasteners are designed to combine the features of a bolt and a rivet, offering a secure fastening method while being easier to install and remove compared to traditional rivets. They consist of multiple parts, typically including a collar and a pin, which work together to create a strong joint.

Moreover, the installation of hi-lok fasteners requires special tools, specifically designed to ensure proper tension and alignment during the fastening process. This feature promotes reliability and safety in aerospace applications where structural integrity is crucial. The threaded shank is characteristic of other fastening systems, such as standard bolts, but is not a feature of hi-lok fasteners. Thus, selecting the option indicating the absence of a threaded shank accurately highlights that characteristic.