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Orig. Dürr
DIN 373
In integral HARD METAL (except size M 8 and M 10 with only the head in hard metal). Similar to DIN 373.For creating the seat to the tapered head of internal hexagonal passing-through screws.For steel and difficult to chip materials, cast iron, aluminium-silicium alloys and stainless steel.
Cylindrical shank. FINE tolerance.