![]() In the following you will find core hole dimension tables for core hole drilling for:Ĭore hole dimensions for metric threads DIN 13 The correct core hole dimensions for core drills, drilling tables and thread tables for metric ISO standard threads: Core hole dimensions for metric thread DIN 13 We recommend that you lower the core hole to the thread diameter. ![]() ![]() This means that the core hole dimension of the twist drill is defined by the thread diameter.įor more information on core hole drilling, please see our blog article:įor blind holes, the core hole must be pre-drilled deeper than the desired thread by the length of the chamfer. Here, the pitch is determined by counting the number of threads on one inch.Ĭore holes have a specific dimension that is adapted to the thread to be cut. For inch threads, however, the dimensions are given in inches. The pitch is calculated by measuring the distance between the first and second tooth. For metric thread types, the dimensions are given in millimetres. The core hole is pre-drilled with a core hole twist drill.Ī distinction is made between metric thread types and inch thread types. ![]() A core hole is a hole into which an internal thread is cut. ![]()
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