Designed for stable deep-hole drilling in steel materials, this 8xD carbide drill combines imported submicron carbide, ALTISIXN wear-resistant coating, optimized point geometry, and reinforced flute structure to improve chip evacuation, hole straightness, wear resistance, and drilling stability in deeper steel hole machining.
The 8xD carbide drill for steel is developed for deeper hole machining where chip evacuation, hole straightness, tool rigidity, and wear resistance are more demanding than standard short-hole drilling. Compared with 3xD and 5xD drills, 8xD steel drilling requires stronger flute support, better chip removal, and more stable cutting performance over a longer drilling depth.
Steel materials such as carbon steel, alloy steel, structural steel, pre-hardened steel, and bearing steel can generate continuous chips and cutting heat during deeper drilling. If chips cannot be removed smoothly, cutting resistance increases, hole accuracy becomes unstable, and tool wear may accelerate. For this reason, an 8xD carbide drill for steel needs stable geometry, reinforced flute design, reliable coating protection, and suitable coolant support.
This drill is manufactured from imported MG grade 0.8 μm submicron tungsten carbide rods with 10% cobalt content. Combined with ALTISIXN wear-resistant coating, optimized point geometry, reinforced flute structure, and controlled edge preparation, it helps improve chip evacuation, maintain hole straightness, reduce edge wear, and support reliable deep-hole drilling in steel components.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | 8xD Carbide Drill for Steel | Drill Type | Solid Carbide Drill |
| Hole Depth | 8xD | Application | Deep-hole steel drilling |
| Workpiece Material | Carbon steel, alloy steel, structural steel, pre-hardened steel, bearing steel | Carbide Material | Imported MG Grade 0.8 μm Tungsten Carbide |
| Cobalt Content | 10% | Helix Angle | 30° |
| Point Angle | 138.9° | Rake Angle | 16° |
| Negative Chamfer | -6° | Core Design | 30–40% Variable Core Diameter |
| Back Taper | 0.8° | Coating | ALTISIXN Wear-Resistant Coating |
| Coating Hardness | 2000–4000 HV | Friction Coefficient | 0.05–0.15 |
| Coolant Type | Internal Coolant / External Coolant Available | Tool Life | Up to 80–100 Meters Under Suitable Machining Conditions |
| Service | Regrinding and Customization Available |
| Drill Diameter (mm) | Flute Length (mm) | Shank Diameter (mm) | Overall Length (mm) | Hole Depth | Coolant Type | Availability |
|---|---|---|---|---|---|---|
| D3.00-D3.30 | 30 | 4 | 70 | 8xD | Internal / External | Standard |
| D3.40-D3.70 | 35.5 | 4 | 75 | 8xD | Internal / External | Standard |
| D3.80-D4.00 | 42 | 4 | 83 | 8xD | Internal / External | Standard |
| D4.10-D5.00 | 50 | 6 | 90 | 8xD | Internal / External | Standard |
| D5.10-D6.00 | 57 | 6 | 97 | 8xD | Internal / External | Standard |
| D6.10-D6.80 | 66 | 8 | 106 | 8xD | Internal / External | Standard |
| D6.90-D8.00 | 76 | 8 | 116 | 8xD | Internal / External | Standard |
| D8.10-D10.0 | 95 | 10 | 139 | 8xD | Internal / External | Standard |
| D10.1-D12.0 | 114 | 12 | 163 | 8xD | Internal / External | Standard |
| D12.1-D14.0 | 133 | 14 | 182 | 8xD | Internal / External | Standard |
| D14.1-D16.0 | 152 | 16 | 204 | 8xD | Internal / External | Standard |
| D16.1-D18.0 | 171 | 18 | 223 | 8xD | Internal / External | Standard |
| D18.1-D20.0 | 190 | 20 | 244 | 8xD | Internal / External | Standard |
Key Features
Made from imported 0.8 μm submicron carbide with 10% cobalt for strength and toughness.
Helps maintain rigidity, edge stability, and drilling accuracy in deeper steel hole machining.
ALTISIXN coating helps improve wear resistance and edge protection in steel drilling.
It supports longer cutting stability, reduced flank wear, and better performance under higher cutting heat.
30° helix and 138.9° point angle support stable penetration and accurate hole positioning.
Split-point design helps reduce drill walking and improves entry stability before deep-hole cutting.
Reinforced flute geometry improves chip evacuation and tool rigidity in 8xD drilling.
Variable core design and back taper help reduce chip clogging, protect the edge, and maintain hole straightness.
This 8xD carbide drill for steel is suitable for deep-hole machining in CNC machining centers and production drilling applications. It is especially useful for steel components where chip evacuation, hole straightness, cutting stability, wear resistance, and batch consistency must be controlled.
Send us your material and hole requirements. Our team will recommend the right drill solution.
Landun CNC Tool is a carbide drill manufacturer focused on precision solid carbide drills and custom carbide drill solutions, supported by advanced grinding, strict inspection, and consistent edge preparation.
Production Facility
Geometry Accuracy Control
Edge Inspection Magnification
Edge Passivation Control
Our carbide drills are ground on German WALTER 5-axis grinding machines for sharp cutting edges, stable accuracy, and smooth drilling performance.
We use WALTER HELICHECK PLUS for contour inspection, keeping profile and radius control within 3 μm for reliable geometric precision.
Each carbide drill is inspected at 300x magnification to check edge quality and avoid chipping or saw-tooth defects before shipment.
Manual drill point honing and automatic rubber-bonded diamond abrasive polishing help improve tool life and control edge consistency within ±0.003 mm.
Common Questions
8xD means the drill is designed for hole depths up to 8 times the drill diameter.
Yes. This drill is suitable for carbon steel, alloy steel, structural steel, pre-hardened steel, bearing steel, and other steel materials under suitable machining conditions.
ALTISIXN is a wear-resistant coating used to improve edge protection, heat resistance, and tool life in steel drilling applications. It helps reduce wear and maintain stable cutting performance.
A 5xD drill is used for medium-depth holes, while an 8xD drill is designed for deeper holes that require stronger chip evacuation, better rigidity, improved coolant support, and more stable hole straightness.
Yes. Internal coolant is recommended for 8xD steel drilling because it helps remove chips, control cutting heat, and maintain stable hole quality in deeper holes.
Yes. We support customization based on drawings, steel grade, diameter, hole depth, coolant method, ALTISIXN coating requirement, and drilling application.
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