Product details:

It is suitable for drilling holes to a depth up to 15 times the diameter of the drill size. The shank diameter is the same as the drill size. The 1813 series has a type N flute form, with a regular helix angle of 21 to 34 degrees, has best performance drilling into steel . An uncoated finish helps keep costs down, yet provides acceptable performance in most situations. The finish helps increase chip flow in soft materials. For drill sizes larger than 33/64 of an inch, they have a steam tempering (also called black oxide) finish. This finish gives a strongly adhering surface treatment that acts to retain cutting fluid and prevent chip to tool welding, reducing the formation of a built-up edge. Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit. Twist drill bits are commonly to drill holes with hand-operated drills, standalone drill presses, or lathes. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. These drill bits have a right-hand twist that brings chips up and away from the cutting edge. They are made to ANSI (fractional sizing) industry standards, which ensure that drill bits around the world, confirm to the same specifications. Dormer Pramet manufactures cutting tools under the following brands: Precision Twist Drill, Dormer, Union Butterfield and Pramet. The company has locations around the world, and provides tools adhering to ANSI, NAS, and DIN standards.