The Ultimate Guide to Buying Metric Machine Screws: From Specs to Selection
Metric screws are identified by a standard callout, such as . Each part of this code tells you exactly what you are buying: buy metric machine screws
Buying metric machine screws can be a daunting task if you don’t speak the "fastener language." Unlike wood screws that taper to a point, metric machine screws have uniform diameters and are designed to thread into pre-tapped holes or mating nuts. Whether you're a DIYer or an engineer, understanding the nuances of the metric system is essential for a secure, professional fit. 1. Decoding the "M" Designation The Ultimate Guide to Buying Metric Machine Screws:
The distance between thread peaks in millimeters. If this number is omitted (e.g., M6 x 20), it is assumed to be a coarse thread , which is the most common variety. 20 (Length): The length of the screw in millimeters. 2. Measuring Length Correctly 20 (Length): The length of the screw in millimeters
The major diameter of the thread in millimeters. An M6 screw is approximately 6mm wide.
Indicates the screw follows ISO metric thread standards.