Gjengetype

Gjengetype refers to the specific configuration of threads on a fastener, such as a screw or bolt. This designation is crucial for ensuring that two threaded components can properly engage and form a secure connection. Different gjengetypes are designed for various applications, materials, and load requirements.

The most common classification of gjengetype is based on the thread's angle and the pitch, which is the distance between adjacent threads. For example, the Unified Thread Standard (UTS) and the Metric Thread Standard (ISO metric) are two major systems. UTS uses inches for measurements and has specific thread series like UNC (Coarse) and UNF (Fine). Metric threads, on the other hand, are measured in millimeters, with a standard designation including the nominal diameter and the pitch (e.g., M10 x 1.5 indicates a 10mm diameter bolt with a 1.5mm pitch).

Beyond standard thread forms, there are specialized gjengetypes. For instance, pipe threads are designed to create a seal when screwed together, often with a taper. Self-tapping screws have threads that can cut into the material they are inserted into, eliminating the need for a pre-tapped hole. The choice of gjengetype depends heavily on the intended use, the materials being joined, and the forces the connection will withstand. Incorrect gjengetype selection can lead to cross-threading, damage to the components, or a weak and unreliable joint.