No.26 LingShan Middle Road, No.23-2 Block Tools Industrial Base, Xixiashu Town,
Changzhou City, Jiangsu Province, China
Structure and characteristics of Fried Dough Twists drill:
Flutes: The main feature of Fried Dough Twists bits is spiral grooves, which help remove chips and cool the bits. The number of slots is usually two, but there are also multiple slot designs.
Cutting Edges: located at the front end of the drill bit, responsible for cutting materials. The sharpness and angle of the cutting edge have a significant impact on drilling efficiency.
Shank: Used for installation in a drill chuck, usually circular or hexagonal in shape.
Point Angle: usually 118° or 135°. 118° is suitable for most materials, while 135° is typically used for hard materials such as stainless steel.
Classify by drill tip angle:
118° tip angle: The most common tip angle, suitable for most materials.
135° tip angle: Used for harder materials such as stainless steel, it can more effectively prevent slipping.
| Specifications | ||||
| (d Dia.) | (I Length of Cut) | (D Shank Dia.) | O.A.L | (A) |
| 0.2 | 3 | 3D | 38L | 118° |
| 0.3 | 3 | 3D | 38L | 118° |
| 0.4 | 3 | 3D | 38L | 118° |
| 0.5 | 4 | 3D | 38L | 118° |
| 0.6 | 6 | 3D | 38L | 118° |
| 0.7 | 6 | 3D | 38L | 118° |
| 0.8 | 6 | 3D | 38L | 118° |
| 1.5 | 8 | 3D | 38L | 118° |
| 2.0 | 10 | 3D | 38L | 118° |
| 3.0 | 25 | 3D | 50L | 1180 |
| 4.0 | 25 | 4D | 50L | 118° |
| 5.0 | 25 | 5D | 50L | 118° |
| 6.0 | 25 | 6D | 50L | 118° |
| 7.0 | 30 | 7D | 60L | 118° |
| 8.0 | 40 | 8D | 75L | 118° |
| 9.0 | 40 | 9D | 75L | 118° |
| 10.0 | 40 | 10D | 75L | 118° |
| 11 | 45 | 11D | 100L | 118° |
| 12 | 50 | 12D | 100L | 118 |
| 12.5 | 50 | 12.5D | 100L | 118° |
| 13 | 50 | 13D | 100L | 118° |
| 9 | 50 | 9D | 100L | 130° |
| 12.3 | 60 | 12.3D | 120L | 130° |
| 12.3 | 65 | 12.3D | 130L | 130° |
| 13.8 | 50 | 13.8D | 100L | 130° |
| 13.8 | 60 | 13.8D | 120L | 130° |
| 12.55 | 90 | 13D | 150L | |
| 12.55 | 90 | 14D | 150L | |
| 14.5 | 70 | 14.5D | 140L | |
| 16 | 75 | 16D | 150L | 118° |
Internal Cooling Drill Bit is commonly used for high-precision and high-efficiency metal processing, especially for deep hole drilling and hard material processing.
Characteristics of Internal Cold Drill:
Internal cooling channels: There are specially designed channels inside the drill bit, through which the coolant directly reaches the drilling area for efficient cooling and lubrication.
High efficiency: Due to its good cooling effect, internal cold drills can work at higher feed and cutting speeds, thereby improving machining efficiency.
Extending the lifespan of drill bits: Effective cooling and lubrication reduce friction and heat accumulation, extending the service life of drill bits.
Better hole quality: Internal cold drilling can better eliminate chips during the machining process, reduce friction and cutting resistance on the hole wall, thereby improving the quality and accuracy of the hole.
Suitable for deep hole machining: Internal cold drilling has significant advantages in deep hole machining, effectively preventing chip accumulation and drill bit overheating.
Application Area:
Aerospace industry: used for processing complex parts of high-strength and high-temperature alloy materials.
Automobile manufacturing: used for processing deep holes and high-precision holes for engines, transmissions, and other critical components.
Mold manufacturing: used for processing cooling water channels and other deep hole structures of molds.
Oil and gas extraction: used for the manufacturing of drilling equipment and tools.
Here are some common specifications examples of internal cooling drill bits:
Diameter: Ø 6mm, Ø 8mm, Ø 10mm, Ø 12mm
Effective drilling length: 20mm, 40mm, 60mm
Total length: 70mm, 100mm, 150mm
Number of cooling holes: 2
Material: Hard alloy
Cutting angle: 135°
Spot Drill Bits are mainly used to prevent the drill bit from shifting during subsequent drilling, improving the accuracy and quality of the hole.
Characteristics of Centering Drill Bit:
Short and sturdy: Centering drill bits are usually short and structurally sturdy to prevent vibration and displacement during drilling.
Center Precision: Designed to drill precise center points on workpieces, helping subsequent drill bits maintain the correct position.
Tip angle: There are usually larger tip angles (such as 90°, 120°, 142°) to ensure quick positioning and drilling.
Material: Usually made of high-speed steel (HSS) or hard alloy to provide sufficient hardness and wear resistance.
