High-hardness drill bit
The DRG30 series of externally cooled general-purpose carbide drill bits is a cost-effective product developed by JIAYI Tools specifically for general-purpose holes up to 6 times the diameter and a wide range of machining applications. It features a "dual-helix external cooling flute + high-rigidity body" design, While balancing precision and efficiency, it delivers the core advantages of "high versatility, long service life, and ease of use," completely resolving the pain points associated with traditional drill bits—namely, "poor versatility, poor chip evacuation, and short service life"— It provides stable, general-purpose hole-machining solutions for the mechanical manufacturing, mold making, and automotive industries, among others.
| Part Number | DRG30082X |
|---|---|
| Drill Bit Base Material | Ultrafine-Grained Tungsten Carbide Alloy |
| Product Name | Internally Cooled Carbide Drill Bits/Step Drill Bits |
| OEM / ODM | Made to your samples or drawings |
| Specifications | Ø11.80 × 96L × Ø12.0 × 162L |
| Lead time | 2 weeks |
| Packaging (mm) | 15 × 15 × 200mm |
| Blade Diameter DC | Ø11.8mm |
| Blade Length LCF | 96.0mm |
| Shank Diameter DC | Ø12.0mm |
| Overall length OAL | 162.0mm |
| Materials | VHM (ultrafine-grained tungsten carbide alloy) |
| Coating | AlTiN |
| MOQ | 2 pcs |
| Origin | Shenzhen, China |
Design details engineered for accuracy, tool life and process stability.
The cutter body is machined from a single piece of ultra-fine-grain carbide (HRC 68) with no welded joints, ensuring no loosening or runout during high-speed, high-feed machining, with a repeatability of ≤0.003 mm.
The 35° helical chip flute allows chips to be discharged smoothly along the flute, improving chip removal efficiency by 30% when machining holes 6 times the tool diameter and reducing chip jams and scratches on the hole walls.
The drill bit features a double-helix external cooling flute design, allowing the coolant to flow directly along the flutes to the cutting edge, improving heat dissipation efficiency by 40% and preventing the risk of drill bit overheating during hole drilling.
The drill tip features a 5°–8° adaptive rake angle design that optimizes cutting force in different materials, reduces tool wear, and improves machining stability.
The drill tip features a 140° centering design with a centering accuracy of ≤0.003 mm, allowing for direct machining without the need to pre-drill a center hole, thereby reducing the number of processing steps and improving efficiency.
Each drill bit passes a G2.5-grade dynamic balancing test, ensuring vibration-free operation at high speeds of 20,000 rpm and guaranteeing machining stability.
The cutting edge is ground using a five-axis CNC grinding machine, with a runout error of ≤0.002 mm, ensuring the roundness and cylindricity of the bo
Pre- and post-polishing processes reduce friction and ensure excellent chip management
Starting values. Our engineers can tune parameters to your machine and workpiece.
| Workpiece material | Cutting speed vc (m/min) | Feed f (mm/rev) | Coolant |
|---|---|---|---|
| Aluminum Alloy | 70–110 | 0.09–0.22 | Internal + MQL |
| Stainless Steel | 35–65 | 0.05–0.14 | Internal + MQL |
| Steel | 50–80 | 0.08–0.2 | Emulsion |
Typical industries and parts machined with this tool.
Send your hole diameter, depth and workpiece material. We supply standard drills and custom step and special drills made to your samples or drawings.