Measure from under the head to the very tip.
The major diameter of the thread in millimeters. An M6 screw is approximately 6mm wide. buy 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 Measure from under the head to the very tip
Measure the entire length , including the head, as these are designed to sit flush with the material surface. 3. Choosing the Right Material and Finish M6 x 20)