Description

Multi-chamfer subland drill, 90° for core 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 8378, 90° countersink angle. Application: For thread core holes according to DIN 336, part 1 and 90° free countersinking corresponding with the through holes according to DIN EN 20273. With Morse taper shank DIN 8379 or VHM design available on request.

Specifications

Bohrstufenlänge l3	11,4 mm
Bohrer-Ø d1 x Senker-Ø d2	3,3 x 4,5 mm
für Gewinde	M4
Gesamtlänge l1	80 mm
Gusseisenwerkstoffe	30
Kupfer, Messing, Bronzen	50
Stähle bis 850 N/mm²	16
Schneidstoff	HSS
Stähle bis 1000 N/mm²	30
Spirallänge l2	47 mm
Winkel	90 °