Step drill 9.0 / 6.8 HSS for M8 screw with cylindrical shank DIN 8378, ZPS
Product information
Czech metal step drill 9,0x6,8 mm for screw M8
Step drill for hole for screw and recessed 90 ° head screw
Overall length: 125mm
Screw length total / Front: 80 / 23mm
Helix Angle: 25 ° to 30 °
Angle of Tip: 118 ° and 90 °
Form: A
DIN8378 / PN221258
Drill bit is cut to two diameters: 6,8mm and 9,0mm
Shank diameter: 9,0mm
Drilling requires lower cutting conditions than standard normatives for classical drills.
Usage:
Stepped drills with four facets are recommended for drilling screw holes and at the same time recesses for cylindrical screw heads in non-alloy and alloy steel and steel castings to a strength of 800 N / mm2, gray, tempered ductile cast iron, aluminum alloys, and the like.
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