Fastener Design Course Part -3 : Different types of Fasteners threads and thread pitch in Detail
Channel: Fasteners
Date: 26/03/2021

This video was from 2 Decades ago. But still there is so much valuable information to follow.

Richard T. Barrett, Senior Aerospace Engineer of NASA Lewis Research Center presents a comprehensive course on fastener design. A recognized expert in the field of fastener technology Mr. Barrett combines lecture, charts, illustrations with real-world experiences. Topics covered include: materials, plantings and coatings, locking methods threads, joint stiffness, rivets, inserts, nut plates, thread lubricants, design criteria, etc.

Fastener design is the process of using engineering principles to design fasteners for use in a product, system, or structure. One of the best ways to learn fasteners, in particular, is to sit down with an experienced practitioner and listen to him or her explain the ups and downs of their career. Richard T. Barrett is an aerospace engineer (aerospace engineer) at NASA Lewis Research Center in Cleveland. He has been involved in aerospace and rocketry for over forty years, including work on the Space Program, rocket engines, and launch pads. He is one of the world's experts on the subject of fasteners and fastener design.

Source: http://www.sti.nasa.gov​
https://www.youtube.com/channel/UCI9BX-UcPOhsfr0fTklLytQ

This course is a comprehensive study of fastener technology. While this course is designed for aerospace engineers, mechanical engineers will find it beneficial. This course is about materials, plants and coatings. There is a summary of locking methods, threads, joint stiffness, rivets and inserts. There is also a discussion of lubricants and design considerations.

The world has changed a lot since the Wright brothers took off from Kitty Hawk in 1903. We now live in a high-tech, high-stress society that demands more and more from our machines and equipment. This is particularly true in the aerospace and aviation industries—where today's airplanes must master more complex flight maneuvers, and where the need for high-speed, high-strength joints and fastening devices is even greater. In the past, many engineers relied on trial and error to design fasteners. But those days are over. Today, one of the fastest—and most economical—ways to design high-performing fasteners is to use the computer.

This course is presented as a comprehensive reference on aeronautical fasteners technology, and covers fasteners materials, fasteners plantings and coatings, fasteners locking methods, fastener threads, fastener joint stiffness, fasteners rivets, fasteners inserts, fastener nut plates, fastener thread lubricants, and design criteria. The course is presented with lecture, charts, illustrations, and real-world experiences, designed to help you understand aerospace fasteners and how to select the right technology for your application.

The fastening industry has a number of different types of threads used to provide a means of securing two or more parts together. The type of thread selected is often dependent upon the application. The two most common types of threads are external threads and internal threads. External threads are used for applications where the fastened parts need to be visible. Internal threads (also known as blind, or hidden threads) are used to conceal the fastener from view. In order to secure an object properly in a fastener, it is necessary to use the right type of thread for the right application. There are many types of threads, thread pitches, material types, and installation methods. Each of these factors can make a difference in the strength of the joint. For example, a self-tapping screw in general has a higher torque requirement than a threaded fastener, and can break if over torqued. A self-tapping screw may also have a tendency to shoot through the workpiece if the drill was not deep enough, resulting in the screw not fully securing the object. In comparison, a threaded fastener generally requires less torque to secure the fastener in place. 

Threads on machine screws and bolts, is there anything more mysterious? Thread pitches, thread forms, thread types, thread classifications... it's hard to know where to even begin. Don't worry, we're here to help. This is the first in a multi-part series that will demystify threads for you. In general, there are two different types of threads: rolled threads and cut threads. The difference between rolled threads and cut threads is how the threads are made. Rolled threads are made by rolling the metal blank through the dies that cut the threads. Cut threads are made by cutting the threads with a special machine or tool called a "die head."