Professional reviews from industry experts Precision Twist QC21G High Speed Steel Jobber Drill Bit, TiN Coated, Round Shank, Parabolic Flute, 135 Degree Point Angle, 1 (Pack of 12)
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| Material | High Speed Steel |
| Cutting Diameter | 0.23 Inches |
| Finish Type | Titanium Nitride |
| Shank Type | Round |
| Cutting Angle String | 135 Degrees |
- Parabolic flute design offers enhanced chip removal, coolant flow to the drill point, and heat dissipation
- Jobber-length drill bits are the most common length drill bit, suitable for a wide range of applications
- 135-degree radius split point is self-centering, reduces walking, good for hard material, and reduces pressure on cutting edges
- Titanium nitride (TiN) is a coating to extend cutting tool life and permit faster cutting speeds than with uncoated tools
- High-speed steel (HSS), for use on a wide variety of materials
Product Description
The Precision Twist QC21G jobber-length drill bit is a parabolic flute design, 135-degree radius split point, round shank drill bit made of HSS with a TiN finish, which is a hard, gold-colored ceramic coating that has low friction, permitting faster cutting speeds than uncoated materials. It is suitable for drilling to a depth up to four times the diameter of the drill. Good for portable or machine drilling. The shank diameter is the same as the drill size. It was designed for drilling holes into a wide variety of metals and synthetic materials with best performance in steel, cast iron, copper, and aluminum magnesium.
The QC21G series has a wide land parabolic flute design that enhances chip (also called swarf) formation and evacuation. Coolant has a better flow to the drill point for heat dissipation, and higher speeds and feeds for increased productivity. It is recommended to use a constant heavy feed rate while drilling. The reinforced web provides increased drill strength and rigidity, and straighter, closer tolerance holes.
Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits are commonly used 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) 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.
Product Specifications
Specification for this product family
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