Two-stage drills

Czech metal step drill bit 28,0x17,0 mm for screw M16 Step drill bit for shaft and recessed head screw 90 ° Overall length: 291mm Screw length total / front: 170 / 35mm Morse cone: MK3 Helix Angle: 25 ° to 30 ° Angle of Tip: 118 ° and 90 ° Form: A Material: HSS Standard: CSN221255 Drill is sharpened to two diameters: 17.0mm and 28.0mm 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, etc. Cat. no .: K552800F000S If you need a different size, see the enclosed photographs - see the DIN8375 catalog sheet - for German screws.

Czech metal step drill bit 33,0x19,0 mm for M18 screw Step drill bit for shaft and recessed 90 ° head screw Overall length: 334mm Screw length overall / front: 185 / 39mm Morse cone: MK4 Helix Angle: 25 ° to 30 ° Angle of the Tip: 118 ° and 90 ° Form: A Material: HSS Standard: CSN221255 Drill is sharpened to two diameters: 19,0mm and 33,0mm 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, etc. Cat. No .: K553300F000S If you need a different size, see the enclosed photos - see the DIN8375 catalog sheet for German screws.

Czech metal step drill bit 37,0x21,0 mm for M20 screw Stepper drill for shaft holes and recessed 90 ° head screw Overall length: 344mm Screw length overall / front: 195 / 43mm Morse cone: MK4 Helix Angle: 25 ° to 30 ° Angle of Tip: 118 ° and 90 ° Form: A Material: HSS Standard: CSN221255 Drill is sharpened to two diameters: 21.0mm and 37.0mm Under drilling you need to choose 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, etc. Cat. No .: K553700F000S If you need a different size, see the enclosed photos - see the DIN8375 catalog sheet for German screws.

Drill is cut to two diameters: 5,0mm and 7,0mm Overall length: 105mm, length of helix: 65mm Shank diameter: 7,0mm Under drilling you need to choose lower cutting conditions than standard norms for classical drills.