Description

90° 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 8374, 90° countersink angle, fine. Application: For screw through holes according to DIN EN 20273 and 90° screw head countersinking. Form A and B according to DIN 74, part 1. For screws according to DIN 963 and DIN 964. With morse taper shank DIN 8375 available on request.

Specifications

Bohrstufenlänge l3	11 mm
Bohrer-Ø d1 x Senker-Ø d2	4,3 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	90 °

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