Description
Product Introduction
SD Series Carbide Standard Drill Bits are specialized solid carbide drilling tools developed for efficient and stable machining of stainless steel and other difficult-to-cut materials. Available in diameters from 1 mm to 20 mm (0.0394"–0.7874") and 3XD or 5XD flute-length configurations, these drills are designed for CNC machining centers, drilling and milling machines, and automated production lines.
Manufactured by CHANGZHOU BOSTONTOOL CO.,LTD., the SD Series combines an ultra-fine grain carbide substrate, HRC60+ hardness, four-facet drill-point geometry, optimized chip-breaking flutes, and nano composite coating. The design specifically addresses common stainless steel drilling problems such as long curled chips, chip wrapping, flute blockage, built-up edge, tip overheating, and unstable hole quality.
The drills are optimized for 304 and 316L stainless steel, stainless steel castings and forgings, as well as other challenging metal materials. Internal through-coolant and external coolant configurations are available to meet different machining requirements.
Key Product Advantages
1. Ultra-Fine Grain Carbide Substrate
The SD Series uses a high-density ultra-fine grain carbide substrate with hardness up to HRC60+. The material provides high rigidity, wear resistance, and thermal stability for demanding stainless steel machining.
The carbide structure helps resist edge chipping, cracking, and premature wear during continuous drilling, supporting stable tool performance and reducing the frequency of tool replacement.
2. Four-Facet Drill Point for Stainless Steel
The specialized four-facet drill point is designed specifically for the characteristics of stainless steel, which tends to be tough, viscous, and prone to chip winding.
The optimized chisel-edge geometry promotes chip breaking while maintaining stable centering. Long stainless steel chips can be divided into smaller segments, helping reduce chip wrapping, flute blockage, and tool jamming.
3. High-Precision Self-Centering
The optimized drill-point structure supports accurate positioning without requiring a separate pre-drilled center hole in suitable applications. Stable centering helps reduce hole deviation and vibration during batch machining.
Under appropriate machining conditions, the finished hole tolerance can reach m7 grade, with a smooth hole wall and reduced need for secondary finishing.
4. Anti-Adhesion Nano Composite Coating
TiN, TiCN, and AlTiN nano composite coating options provide high hardness, thermal resistance, oxidation resistance, and low friction.
The coating is designed to reduce the affinity between the cutting tool and stainless steel, helping suppress built-up edge and material adhesion. It also supports both dry and coolant-assisted cutting depending on the selected configuration and machining conditions.
5. Internal & External Coolant Options
The SD Series supports internal through-coolant and external coolant configurations. Through-coolant delivers cutting fluid closer to the drill tip and cutting zone, helping remove heat and improve chip evacuation.
Effective cooling and lubrication are particularly important when drilling stainless steel because high cutting temperatures and material adhesion can accelerate tool wear and cause tip damage.
Product Specifications
| Item | Specification |
|---|---|
| Series | SD Series |
| Tool Type | Solid Carbide Standard Drill |
| Application | Stainless Steel Drilling |
| Diameter Range | 1–20 mm |
| Inch Range | 0.0394"–0.7874" |
| Flute Length | 3XD / 5XD |
| Drill Point | Four-Facet |
| Cooling | Internal Through-Coolant / External Coolant |
| Substrate | Ultra-Fine Grain Carbide |
| Substrate Hardness | HRC60+ |
| Coating Options | TiN / TiCN / AlTiN |
| Cutting | Dry / Wet Cutting |
| Main Materials | 304 / 316L Stainless Steel, Stainless Steel Castings & Forgings |
| Equipment | CNC Machining Centers, CNC Drilling & Milling Machines, Automated Production Lines |
Standard 3XD Dimensions
| Diameter (mm) | Cutting Length (mm) | Shank (mm) | Overall Length (mm) |
| 1–1.2 | 4 | 4 | 50 |
| 1.3–1.4 | 5 | 4 | 50 |
| 1.5–1.6 | 6 | 4 | 50 |
| 1.7–1.8 | 7 | 4 | 50 |
| 1.9–2.0 | 8 | 4 | 50 |
| 2.1–2.3 | 9 | 4 | 50 |
| 2.4–2.5 | 10 | 4 | 50 |
| 2.6–2.8 | 11 | 4 | 50 |
| 2.9 | 12 | 4 | 50 |
| 3.0–3.7 | 20 | 6 | 62 |
| 3.8–4.7 | 24 | 6 | 62 |
| 4.8–6.0 | 28 | 6 | 66 |
| 6.1–7.0 | 34 | 8 | 79 |
| 7.1–8.0 | 41 | 8 | 79 |
| 8.1–10.0 | 47 | 10 | 89 |
| 10.1–12.0 | 55 | 12 | 102 |
| 12.1–14.0 | 60 | 14 | 107 |
| 14.1–16.0 | 65 | 16 | 115 |
| 16.1–18.0 | 73 | 18 | 123 |
| 18.1–20.0 | 79 | 20 | 131 |
Standard 5XD Dimensions
| Diameter (mm) | Cutting Length (mm) | Shank (mm) | Overall Length (mm) |
| 1.0–1.1 | 6 | 4 | 50 |
| 1.2 | 7 | 4 | 50 |
| 1.3 | 8 | 4 | 50 |
| 1.4–1.5 | 9 | 4 | 50 |
| 1.6–1.7 | 10 | 4 | 50 |
| 1.8 | 11 | 4 | 50 |
| 1.9–2.0 | 12 | 4 | 50 |
| 2.1–2.3 | 13 | 4 | 50 |
| 2.3–2.4 | 14 | 4 | 50 |
| 2.5 | 15 | 4 | 50 |
| 2.6–2.7 | 16 | 4 | 50 |
| 2.8–2.9 | 17 | 4 | 50 |
| 3.0–3.7 | 28 | 6 | 66 |
| 3.8–4.7 | 36 | 6 | 74 |
| 4.8–6.0 | 44 | 6 | 82 |
| 6.1–8.0 | 53 | 8 | 91 |
| 8.1–10.0 | 61 | 10 | 103 |
| 10.1–12.1 | 71 | 12 | 118 |
| 12.1–14.0 | 77 | 14 | 124 |
| 14.1–16.0 | 83 | 16 | 133 |
| 16.1–18.0 | 93 | 18 | 143 |
| 18.1–20.0 | 101 | 20 | 153 |
Stainless Steel Machining Applications
The SD Series is designed for stainless steel drilling applications involving:
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304 stainless steel
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316L stainless steel
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Austenitic stainless steel
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Ferritic stainless steel
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Martensitic stainless steel
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Duplex stainless steel
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Precipitation-hardening stainless steel
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Stainless steel castings
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Stainless steel forgings
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General cast steel
For titanium alloy and nickel-based alloy machining, appropriate cutting parameters and cooling conditions should be selected according to the workpiece and actual machine setup.
Application Industries
SD Series Carbide Standard Drill Bits are suitable for a wide range of industrial applications, including:
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Automotive component manufacturing
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Chemical equipment production
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Food machinery manufacturing
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Precision hardware
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Aerospace component machining
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Mold manufacturing
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CNC precision machining
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Stainless steel fabrication
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Automated batch production
Professional Flute & Chip-Breaking Design
Stainless steel can generate long, continuous chips that easily wrap around the tool or accumulate inside the flute. The SD Series uses a specialized flute geometry with polished surfaces to create a smoother chip evacuation path.
The chip-breaking structure helps divide long chips into smaller segments, reducing the risk of flute blockage and improving machining stability. This design is especially useful for continuous CNC drilling and high-volume production.
Recommended Cutting Parameters
The following parameters are reference values for stainless steel and other difficult-to-cut materials. Actual settings should be adjusted according to machine rigidity, workpiece clamping, tool overhang, hole depth, cooling method, and machining conditions.
Ferritic / Martensitic / Austenitic Stainless Steel
Recommended cutting speed: 50–90 m/min
For diameters from 3–16 mm, typical spindle speeds range from approximately 8,500 rpm down to 1,600 rpm, with feed rates from 0.06–0.30 mm/rev depending on diameter and material hardness.
For precipitation-hardening stainless steel, the recommended cutting speed is approximately 40–60 m/min, with lower spindle speeds selected according to workpiece hardness.
Duplex Stainless Steel, Titanium Alloy & Nickel-Based Alloy
| Material | Recommended Cutting Speed |
| Duplex Stainless Steel | 40–60 m/min |
| Titanium Alloy | 30–50 m/min |
| Ni-Based Alloy | 40–80 m/min |
Typical feed ranges are approximately 0.06–0.30 mm/rev for duplex stainless steel, 0.06–0.30 mm/rev for titanium alloy, and 0.05–0.20 mm/rev for nickel-based alloys, depending on drill diameter.
Coolant recommendations: The above parameters are intended for water-soluble cutting oil with internal coolant supply. When using non-water-soluble cutting oil, reduce cutting speed by approximately 20–30% and ensure sufficient oil supply.
For angled or interrupted workpiece entry and exit conditions, reduce the feed rate by approximately half during entry and exit.
Why Choose SD Series Stainless Steel Drills?
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Specifically optimized for stainless steel
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1–20 mm diameter range
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3XD and 5XD flute-length options
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Four-facet drill-point design
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Strong chip-breaking capability
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Reduced chip wrapping and flute clogging
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High-precision self-centering
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Hole tolerance up to m7 under suitable conditions
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Ultra-fine grain carbide substrate
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HRC60+ hardness
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TiN/TiCN/AlTiN coating options
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Internal and external coolant configurations
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Suitable for dry and wet cutting
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Designed for continuous CNC machining
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Supports 304 and 316L stainless steel
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OEM/ODM customization available
B2B Supply & Customization
CHANGZHOU BOSTONTOOL CO.,LTD. focuses on carbide drilling tools for difficult-to-machine materials and provides industrial drilling solutions for distributors, machining companies, tooling suppliers, and OEM customers.
Standard 1–20 mm sizes are available, with standard products supporting sample orders and bulk procurement. Customized options can include non-standard diameters, special flute lengths, coating specifications, drill-point angles, and customer logo laser engraving.
For bulk orders, provide the required diameter, flute length, material, cooling method, application, and quantity so the appropriate configuration and cutting parameters can be recommended.
Factory & Quality Advantages
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Professional carbide drill manufacturing
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Focus on difficult-to-cut material applications
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Full-process inspection from carbide blank to finished coating
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Stable batch dimensional accuracy
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Standard sizes available for faster delivery
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Technical support for stainless steel machining
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OEM/ODM service for qualified projects
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Suitable for sample testing and large-volume production
Packaging & Delivery
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Packaging: Strong export packaging suitable for long-distance transportation.
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Delivery: Lead time depends on order quantity and specifications.
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Loading Port: Arranged according to seller's convenience.
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Inspection: In accordance with BOSTON standards.
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Payment: 100% T/T in advance according to agreed contract terms.
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Insurance: Overseas insurance arranged according to agreed trade terms.
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Custom Orders: Quantity tolerance and return conditions are subject to the agreed contract.
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Claims: Quality or quantity discrepancies should be reported within the applicable contractual claim period and supported by an agreed inspection report where required.
Frequently Asked Questions
Q1: What is the difference between SD Series drills and ordinary carbide drills?
SD Series drills are specifically engineered for stainless steel. Their four-facet drill point, chip-breaking flute geometry, and anti-adhesion coating are designed to address long chips, tool wrapping, built-up edge, and high cutting temperatures commonly encountered in stainless steel drilling.
Q2: Are these drills suitable for 304 and 316L stainless steel?
Yes. The SD Series is optimized for 304 and 316L austenitic stainless steel and can also be used for stainless steel castings, forgings, and other stainless steel grades when appropriate cutting parameters are selected.
Q3: Can the SD Series support dry cutting?
Yes. The nano composite coating supports dry and wet cutting. For long-cycle stainless steel drilling, however, appropriate coolant supply can improve heat control, chip evacuation, and tool stability.
Q4: What drilling accuracy can the SD Series achieve?
Under suitable machine and cutting conditions, the self-centering four-facet drill-point design can achieve finished hole accuracy up to m7 grade.
Q5: Why use through-coolant for stainless steel drilling?
Through-coolant delivers cutting fluid toward the cutting zone, helping remove heat and chips while improving lubrication. This can reduce the risk of tip overheating, chip accumulation, and built-up edge during continuous drilling.
Q6: Do you support customized stainless steel drills?
Yes. CHANGZHOU BOSTONTOOL CO.,LTD. supports customized diameters, flute lengths, coatings, drill-point configurations, and customer logo laser marking for qualified OEM/ODM projects.
Product Summary
SD Series Carbide Standard Drill Bits are specialized solid carbide drills designed to provide stable and efficient drilling performance in stainless steel machining. With a 1–20 mm diameter range, 3XD/5XD options, four-facet drill-point geometry, chip-breaking flutes, nano composite coating, and internal or external coolant configurations, the series is suitable for CNC machining and automated production.
For 304, 316L, stainless steel castings, forgings, and other difficult-to-machine materials, the SD Series provides a focused drilling solution designed to improve chip control, reduce tool adhesion, maintain hole quality, and support continuous production.
For bulk purchasing, sample testing, OEM/ODM requirements, or customized stainless steel drilling tools, contact CHANGZHOU BOSTONTOOL CO.,LTD. for product specifications and quotation.
