April 2025 Tip: Thread Dimensions, Shapes, and More

This 18-page file is a must-have for any machinist who works with threads. The image below is just the first page of what you'll receive in this highly recommended PDF. What you'll receive in this PDF: Basic thread dimensions for coarse threads and tap drill sizes. Includes major, pitch, and minor diameters. Basic thread dimensions for fine threads and tap drill sizes. Basic thread dimensions for special thread pitches and tap drill sizes. Basic thread shapes. Constants used to find pitch and root diameters of screw threads. Class II screws and nuts pitch minimum and maximum diameter limits with threads per inch provided. Metric threads comparison chart. ISO metric and ISO inch thread form. Recommended metric series thread form. Metric formula to obtain tap drill sizes. 3-wire method to measure metric and American standard threads. American national pipe thread according to pitch diameter of thread at the end of the pipe and at the gauging notch, outside diameter of the pip...