High-hardness drill bit
The DPX50C series of internally cooled, high-helix carbide drill bits are high-performance tools developed by JIAYI Tools specifically for deep-hole drilling up to 8 times the diameter and for machining materials prone to tool sticking. They feature a "dual-hole internal cooling + 42° high-helix flute" design, By achieving breakthroughs in the machining of materials such as stainless steel and titanium alloys—including "zero clogging in helical chip evacuation, direct internal cooling to the cutting zone, and high feed rates without tool burning"—these drills completely resolve the pain points associated with traditional drills, such as "poor chip evacuation, tool sticking, and inadequate heat dissipation," It provides reliable deep-hole drilling solutions for the aerospace, energy equipment, and mold industries, among others.
| Part Number | DPX50C082X |
|---|---|
| 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 drill bit features two built-in high-precision internal coolant channels capable of delivering cooling pressure up to 100 bar. The coolant is directed straight to the cutting edge, improving heat dissipation efficiency by 50% and preventing the risk of drill bit burnout during deep-hole drilling.
Featuring a 42° high-helix angle design, chips are naturally discharged upward along the flute, improving chip removal efficiency by 45% during deep-hole machining at 8 times the diameter, thereby reducing chip jams and scratches on the hole walls.
Utilizing PVD nano-coating technology, this coating has a thickness of 1.5 μm and a coefficient of friction as low as 0.15. It is better suited for materials prone to tool sticking than traditional TiAlN coatings and extends tool life by 2.5 times.
The drill bit features a 140° centered 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 bore.
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 |
|---|---|---|---|
| 316L Stainless Steel | 50–80 | 0.06–0.15 | Internal + MQL |
| Inconel 718 | 30–50 | 0.04–0.1 | High-pressure internal |
| Ti6Al4V titanium alloy | 40–60 | 0.05–0.12 | High-pressure internal |
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.