HSS-XE tube and sheet drill, 4-20mm, CBN ground, 2 cutting edges
The Karnasch Professional tube and sheet drill made of HSS-XE steel and spiral fluted with split point
Karnasch TUBE AND SHEET DRILLS are a low price alternative to STEP DRILLS. Tube and sheet drills are designed to drill slightly conical holes in sheet metal of an thickness up to 4 mm (5/32"). The holes are deburred on both sides by the paring cut.
This versatile tool combines several drills with diameters of 4 - 20mm (3/16" - 13/16"). The radius transition simultaneously bezels or deburrs the bore holes.
The drills are axial-radially relief grounded and can be resharpened at the tooth face.
Made of high-alloyed special steel XE“ for considerably longer service life than HSS-Steel.
The CBN ground and spiral flutes guarantee smooth running and high cutting performance. The chip flow is optimized and removed easily as with a twist drill.
3-Flat shank for:
- Excellent torque transmission
- No slippage in the drill chuck
- This results to superior cutting output
All step drills and sheets drills are also available in the patented TiN-GOLD coating or BLUE-DUR-coating. Coatings significantly increase the service life. Strongly recommended for difficult materials such as stainless steels and if drilling without coolants.
All step drills and sheet drills comes lasered with diameters in the spiral.
All step drills and sheet drills are made of high-alloy steel HSS-XE for a hardness up to 68 HRC. This results in high wear resistance and service life.
Step drills and sheet drills are also available spiral-fluted for:
- Smooth cutting behavior
- No sticking in the material
- Low cutting forces
- Less burrs on the work piece
- Longer service life
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