High-hardness drill bit
The DRX50 series of internally cooled, high-performance carbide drill bits are highly reliable products developed by JIAYI Tools specifically for precision hole drilling up to 8 times the diameter and for machining a variety of materials. They feature a "dual-hole internal cooling + high-rigidity shank" design, While balancing precision and efficiency, it delivers the core advantages of "high versatility, long service life, and strong vibration resistance," completely resolving the pain points of traditional drill bits—namely, "poor versatility, poor chip evacuation, and short service life"— It provides stable, precision hole-machining solutions for the mechanical manufacturing, mold making, and automotive industries, among others.
| Part Number | DRX50082X |
|---|---|
| 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.
Featuring a 35° helix angle for chip evacuation, chips are smoothly discharged along the flutes, improving chip evacuation efficiency by 35% when machining holes 8 times the tool diameter, thereby reducing chip jams and scratches on the hole walls.
The drill bit features two built-in internal coolant channels capable of delivering cooling pressure up to 90 bar. The coolant is directed straight to the cutting edge, improving heat dissipation efficiency by 45% and effectively preventing the risk of drill bit burnout during deep-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 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 |
|---|---|---|---|
| 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.