HSS-XE Tin-Gold Coated tube and sheet drill, 3-14mm, CBN ground, 2 cutting

The Karnasch Professional tube and sheet drill made of HSS-XE steel + TiN-GOLD coating and straight 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 3 - 14 mm (3/16" - 9/16"). 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.

HSS-XE steel + TiN-GOLD-coated

Made of high-alloyed special steel XE for considerably longer service life than HSS-Steel. TiN-GOLD-coating for a further substantial increase in service life also when machining dry (no/little cooling).

Flute 1 is marked with metric diameters.
Flute 2 is marked with inch diameters.

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 available in the patented BLUE-DUR-coating or TiN-GOLD-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

TiN-Gold Coating

For considerably longer tool life in all types of steel for wet and dry machining.

• Coating technology: PVD
• Micro hardness: 2700 HV0.05
• Coating material: TiN
• Coating thickness: Diameter-related
• Max. operating temperature: 600 degrees C

This optimized TiN gold coating provides for a substantial increase of tool life. Due to its high hardness and low coefficient of friction, significant tool life increases are achieved even with dry machining (without/with little cooling).