Throughthreading

Throughthreading refers to a manufacturing process where a hole is completely penetrated by a threading tool. This means the tap or die used to create the internal or external threads will pass all the way through the workpiece, exiting on the opposite side. This is in contrast to blind threading, where the threads are only created up to a certain depth within a hole.

The primary purpose of throughthreading is to create a fully threaded surface that can accept a fastener, such as a bolt, all the way through. This is common in applications where components need to be joined securely with a nut on the opposite side, or where a bolt needs to pass completely through a series of parts.

Achieving proper throughthreading requires careful consideration of several factors. The length of the hole must be sufficient to accommodate the threading tool and allow it to exit cleanly. Tool selection is also critical; the tap or die must be designed for the specific thread size, pitch, and material being worked. Proper lubrication and chip evacuation are essential to prevent tool breakage and ensure a smooth, accurate thread form.

When drilling the initial hole for throughthreading, an appropriate clearance is typically provided to allow the threading tool to advance without excessive friction. The accuracy of the initial hole diameter directly impacts the quality of the final threads. In some cases, specialized tooling or techniques may be employed to achieve high-precision throughthreading, especially for critical applications.