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This section covers threading formulas and definitions for how to calculate cutting speed, feed rate, or any other parameter for your thread turning, thread milling, or tapping operations. You will also find the designation for different thread forms according to international standards.
The basic profile of a metric (and Unified) thread is shown as the blue line below: The thread is based upon an equilateral triangle of height H. The height of the parts of the thread are all based upon the H dimension. Longitudinal dimensions are based upon the pitch P of the thread.
This International Standard specifies the basic dimensions, in inches, of ISO inch screw threads in accordance with ISO 263. The values refer to the basic profile in accordance with ISO 68-2.
Basic Thread Dimensions (UNC, UNF & UNEF) The basic dimensions are nominal dimensions of a unified thread profile without allowance and tolerances (The thread class defines that). They are based on standard ASTM B1.1. The basic dimensions can be used for design.
Each thread is characterized by its major diameter, D (D maj in the diagram), and its pitch, P. ISO metric threads consist of a symmetric Vshaped thread. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. The thread depth is 0.614 × pitch.
Thread profiles – Determining variables on the thread. In today’s article we will take a closer look at thread profiles. The main focus is on the outer diameter, the core diameter, the flank diameter.
The thread form is the configuration of the thread in an axial plane; or more simply, it is the profile of the thread, composed of the crest, root, and flanks. At the top of the threads are the crests, at the bottom the roots, and joining them are the flanks.
