Precision Twist R56CO Cobalt Steel Reduced Shank Drill Bit, Black and Bronze Oxide Finish, 1/2" Reduced Shank, 118 Degree Split Point, 25/32"
🔥 Precision Twist R56CO Cobalt Steel Reduced Shank Drill Bit, Black and Bronze Oxide Finish, 1/2 Reduced Shank, 118 Degree Split Point, 25/32 A quick website review
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| Material | Cobalt Steel |
| Cutting Diameter | 0.78 Inches |
| Finish Type | Black and Gold Oxide |
| Shank Type | Round |
| Cutting Angle String | 118 Degrees |
- High-speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances
- Combination black oxide and gold finish, improves lubricity, resists corrosion, and will not chip or flake off
- Half-inch round shank allows larger sized drills to fit into small size chucks
- Jobber-length drill bits, most common length drill bit, suitable for a wide range of applications
- 118-degree split-point angles, for general drilling applications
Product Description
The Precision Twist R56CO Jobber-length, combination black (also called steam tempered) and bronze oxide, general-purpose, round shank drill bit drills holes into a wide variety of metals and synthetic materials with best performance with steel, stainless steel, cast iron, titanium, nickel, and copper. It can drill to a depth up to four times the diameter of the drill size. Flute length is three inches, overall length is six inches, with a half-inch, reduced shank.
The R56CO series has a type N flute form (a regular helix angle of 21 to 34 degrees). The combination black oxide and bronze finish improves lubricity, resists corrosion, and will not chip or flake off. Black and bronze oxide is an appealing surface treatment which combines the benefits of both black oxide and bronze oxide. Black oxide finish gives a strongly adhering blue oxide surface that acts to retain cutting fluid and prevent chip to tool welding, reducing the formation of a built-up edge. Bronze oxide is a low temperature heat treatment which reduces grinding stress within the tool, and has an appealing, easy-to-identify bronze color. Bronze oxide is commonly used to identify cobalt steel tools.
Reduced shanks are smaller than the drill diameter, so they can drill holes larger than the typical chuck capacity. These are sometimes called Silver & Deming drills; they used to be made by Silver & Deming in the late 1800s, but now it refers to any reduced shank twist drill bit.
Made of HSS with cobalt which is many times harder/stiffer than HSS, will hold an edge longer, and will deflect less than HSS. These are also more resistant to heat than HSS. These qualities allow it to run at higher speeds and feeds. They are made to ANSI (fractional sizing) industry standards, which ensure that drill bits around the world, conform to the same specifications.
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.
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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