Bolt Depot - How Fastener Measurements are Notated. Basic Identification Below is an example of a full fastener description.
This notation includes all of the information needed to identify the fastener. Fastener Type Fastener Type is the general type of fastener, such as wood screws, hex bolts, machine screws, hex nuts or carriage bolts. Head. Drill Chart. Common Length Conversions. AB Hole Sizes. Online Unit Converter.