Tapping bottoming hole in 4140HT, prefilled hole with Tap Magic EP-Extra

Описание к видео Tapping bottoming hole in 4140HT, prefilled hole with Tap Magic EP-Extra

Experimented with various brand/style taps. This TIN coated Walter-Prototyp is absolutely the best. Previous best (OSG) lasted about 100pcs before breaking. This new tap has done 200 so far but still looks brand new under microscope. Edit; have done 800pcs on this same tap now and still looks new.

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