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

[stan19]

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

 

[FredGarvin]

Question 1:
https://www.physicsforums.com/showpost.php?p=1160829&postcount=11

Question 2:
http://www.hi-shear.com/fastener_hl_stds.htm
http://www.gen-aircraft-hardware.com/template.asp?pagename=hiloks

 

[ravenprp]

.Hello,

As an expert in fasteners, I would be happy to provide some reference information about the difference between bolts and screws.

Bolts and screws are both types of fasteners that are used to join two or more objects together. However, there are some key differences between the two.

Bolts are generally larger and stronger than screws, and are designed to be used with nuts. They have a smooth, cylindrical shaft and a threaded end, and are typically used to hold heavy or large objects together. Bolts also require a tool, such as a wrench or socket, to tighten or loosen them.

On the other hand, screws have a tapered or pointed end and a threaded shaft that runs along the entire length of the screw. They are usually smaller and are designed to be driven directly into a material, without the need for a nut. Screws can be tightened or loosened using a screwdriver or power drill.

As for your second question about Hi-Lok, it is a specific type of fastener that is commonly used in aircraft structures. It is a high-strength, precision fastening system that is designed to withstand extreme conditions and provide a secure connection.

Hi-Lok fasteners come in a variety of sizes and oversizes, depending on the specific application and strength requirements. The number of oversizes for a nominal size can vary, but typically there are 2-3 oversizes available. The increment of nominal size can also vary, but it is usually around 0.005 inches.

I hope this information is helpful for your license interview. If you need any further clarification or have additional questions, please let me know. Best of luck!