What Are the Differences Between Bolts, Screws, and Hi-Lok Fasteners?

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Bolts and screws differ primarily in their design and application; bolts typically require a nut for fastening, while screws are self-tapping and can be driven directly into materials. Hi-Lok fasteners are specifically designed for aircraft structures, offering high strength and reliability. They come in various nominal sizes with several oversizes available, allowing for adjustments in fit. The increments between nominal sizes and oversizes are standardized to ensure compatibility and performance. Understanding these distinctions is crucial for aerospace applications and licensing requirements.
stan19
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First question: Whats the difference between bolt and screw?Any expert can give some reference info about it?


Second Q: Hi-Lok is commonly use on aircraft structure. Anyone can give more info about the spec of it? such as oversizes? how many oversizes are there for a norminal size? what's the increment of norminal size as well oversizes.

Thank you, i need all these answer for license interview
 
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