Description

180° multi-chamfer subland drill for through holes Design: Profile grinding, right cutting, with precision ground point. Normal angle of rake, core thickness and core gradient. Drilling and countersinking are produced in a single step, aligned to each other. Ø Tolerance: d1 = h9 d2 = h8 Note: The cutting speed is orientated towards the large diameter, the feed towards the small diameter. Design: DIN 8376, 180° countersink angle, medium. Application: For screw through holes according to DIN EN 20273 and 180° screw head countersinking. Form H, J and K according to DIN 84, DIN 912, DIN 6912, DIN 7513 and DIN 7984. With Morse taper shank DIN 8377 or VHM design available on request.

Specifications

Bohrstufenlänge l3	11 mm
Bohrer-Ø d1 x Senker-Ø d2	4,5 x 8,0 mm
für Gewinde	M4
Gesamtlänge l1	117 mm
Gusseisenwerkstoffe	30
Kupfer, Messing, Bronzen	50
Stähle bis 850 N/mm²	16
Schneidstoff	HSS
Stähle bis 1000 N/mm²	30
Spirallänge l2	75 mm
Winkel	180 °