Fastener Basics
Devices that are used to connect two or more objects together mechanically, are called “fasteners.” There are countless types of mechanical fasteners, and each one is specifically designed for a particular application. This module will identify and describe screw types, identify and describe bolt types, and describe how to use a torque wrench.
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Learning Objectives
• Define screw, bolt, nut, washer, and torque wrench • Identify and describe screw types • Identify and describe bolt types • Describe fastener diameter, length, and thread count • Describe how to use a torque wrench • Describe why torque wrench extensions are used
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video |
| Based on: | Industry Standards and Best Practices |
Key Questions
What is the purpose of a fastener?
Fasteners are used to connect two or more objects together mechanically.
What are some common types of screws?
Wood screws, shet metal screws, machine screws, and socket screws are the most common types of screws.
How are bolts different from screws?
Bolts are threaded fasteners like screws, but they’re held in place by either a nut or a threaded hole on the other side.
How are screws and bolts measured?
Regular screws are measured from just under the head to the end of the screw, but a countersunk fastener is measured from end to end.
What is torque?
Torque is a force that causes a change in rotational motion around an axis. A torque wrench is used to apply a specified amount of torque to a fastener.
Sample Video Transcript
Even though the term “screw” and “bolt” are often used interchangibly, they are different. A bolt is a threaded fastener, like a screw, but it is held in place either by a nut or a threaded hole on the other side. The most common types of bolts include: hex bolts, which are primarily used in machinery and construction, lag bolts, which are large wood screws with hex heads and used in wood construction and landscaping, carriage bolts, which have smooth rounded heads with a square section to pull deeply into the material to stop any spinning during installation, eye bolts, which have a circular loop on one end, so that rope or chain can be attached to it, u-bolts, which are formed in a u shape and used to affix piping or other objects with round surfaces to a material, and studs, which are bolts without heads and threaded on both ends.
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