General notes on core holes Depth of the core hole for thread cutting/thread forming Drilling depth > effective thread depth + chamfer length + s

General notes on core holes Depth of the core hole for thread cutting/thread forming Drilling depth > effective thread depth + chamfer length + safety margin Please note For flat-bottomed core holes, take into consideration the type of point that the threading tool might have (male center or male center with reduced point). Special notes on the core hole in thread forming The core diameter of a thread is produced by the thread former and depends on the flow properties of the formed material. In the case of Walter Prototyp products, the guide value for the pilot hole is marked on each thread former. The following tolerances, relative to this guide value, should be kept After the forming process, it is essential to gauge the thread core diameter. > 0.3 mm to < 0.5 mm ± 0.02 mm > 0.5 mm to < 1 mm ± 0.03 mm > 1 mm ± 0.05 mm Rule of thumb hole diameter nominal diameter 0.45 x lead Example M10 thread forming Hole diameter 10.0 mm 0.45 x 1.5 mm 10.0 mm 0.675 mm 9.325 mm 9.3 mm Lead Diameter tolerance < 0.3 mm ± 0.01 mm D 446 WALTER PROTOTYP Technical information threading Application information