Designed for demanding extra-deep-hole drilling in stainless steel materials, this 20xD carbide drill combines imported MG grade 0.8 μm carbide, ALTISIXN wear-resistant coating, optimized point geometry, reinforced extra-deep-hole flute structure, and internal coolant channels to improve long-distance chip evacuation, reduce work hardening, control cutting heat, and maintain reliable hole straightness in precision stainless steel machining.
The 20xD carbide drill for stainless steel is designed for demanding extra-deep-hole applications where chip evacuation, heat control, hole straightness, coolant delivery, and process stability are critical. Compared with 12xD or 15xD drilling, 20xD stainless steel machining places significantly higher demands on pilot hole accuracy, spindle runout, coolant pressure, flute rigidity, tool holding, and machine stability.
Stainless steel materials such as 304, 316L, 17-4PH, and duplex stainless steel have high toughness, poor thermal conductivity, and a strong tendency to work-harden during machining. In a 20xD hole, chips must travel a very long distance before leaving the cutting zone, while cutting heat is difficult to transfer away from the drill point.
Unstable chip evacuation or insufficient coolant delivery may cause chip packing, heat buildup, work hardening, cutting edge overload, hole deviation, burr formation, or premature drill failure. Maintaining continuous chip flow and stable cutting engagement is especially important throughout the full drilling depth.
This 20xD carbide drill is manufactured from imported MG grade 0.8 μm tungsten carbide rods with 10% cobalt content, supporting tool rigidity and edge stability. Combined with ALTISIXN coating, reinforced flute geometry, internal coolant channels, controlled edge preparation, Walter inspection, and German Walter 5-axis grinding, it helps maintain reliable drilling performance and consistent hole quality in extra-deep stainless steel applications.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | 20xD Carbide Drill for Stainless Steel | Drill Type | Solid Carbide Extra-Deep-Hole Drill |
| Hole Depth | 20xD | Application | Extra-deep-hole drilling in stainless steel materials |
| Workpiece Material | 304, 316L, 17-4PH, duplex stainless steel, stainless steel alloys | Carbide Material | Imported MG Grade 0.8 μm Tungsten Carbide |
| Cobalt Content | 10% | Coating | ALTISIXN Wear-Resistant Coating |
| Passivation Control | ±0.003 mm | Edge Inspection |
|
| Service | Regrinding and Customization Available | Tool Life | Up to 80–150 Meters Under Suitable Machining Conditions |
Key Features
Made from imported MG grade 0.8 μm tungsten carbide with 10% cobalt content.
The fine carbide grain structure helps provide the rigidity, edge strength, and dimensional stability required for extra-deep stainless steel hole drilling.
ALTISIXN coating helps improve wear resistance, heat resistance, and cutting edge protection during stainless steel machining.
It supports stable cutting performance, reduces premature edge wear, and helps protect the drill against heat-related damage during long drilling cycles.
Optimized drill point geometry supports stable entry and accurate hole positioning.
A stable drill point helps reduce drill walking, improve starting accuracy, and minimize work hardening at the hole entrance before long-depth drilling.
Reinforced flute geometry balances chip space and drill rigidity for extra-deep-hole machining.
The variable core design and back taper help reduce internal friction, improve chip flow, protect the cutting edge, and support better hole straightness
This 20xD carbide drill for stainless steel is suitable for extra-deep-hole machining in CNC machining centers and automated production equipment. It is intended for stainless steel applications where long-distance chip evacuation, cutting heat control, internal coolant delivery, hole straightness, and reliable batch performance are important.
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
20xD means the drill is designed to produce holes up to 20 times its diameter. For example, a 5 mm drill can be used for a hole depth of approximately 100 mm under suitable machining conditions.
Yes. This 20xD carbide drill is designed for 304, 316L, 17-4PH, duplex stainless steel, and other stainless steel alloys under suitable machining conditions.
The drill uses ALTISIXN wear-resistant coating, which helps improve heat resistance, edge protection, wear resistance, and cutting stability during stainless steel extra-deep-hole drilling.
A 20xD drill has a longer unsupported body and a longer chip evacuation path than a 15xD drill. It requires more accurate pilot guidance, stronger coolant delivery, lower spindle runout, and more stable machine conditions.
Internal coolant is required for most 20xD stainless steel applications. It helps carry chips through the long flutes, control cutting heat, reduce work hardening, and protect the cutting edge.
A precision pilot or guide hole is typically required for 20xD drilling. It guides the long drill during entry and helps improve hole positioning, straightness, and process safety.
Pilot hole accuracy, spindle runout, tool holder condition, machine rigidity, coolant pressure, feed stability, drill geometry, and workpiece setup can all affect hole straightness.
Yes. We support customization based on drawings, stainless steel grade, diameter, hole depth, coolant method, ALTISIXN coating requirement, shank size, and drilling application.
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