Double Flute (Dual-Lip) Twist Drill Bits
Industrial-Grade Precision Drilling Tools for B2B Bulk Supply
Product Overview
Our double flute (dual-lip) twist drill bits are engineered for professional, high-precision drilling operations, delivering unmatched performance, stability, and efficiency across a wide range of industrial and commercial applications. Designed for B2B partners including hardware distributors, manufacturing facilities, construction contractors, and tool wholesalers, these drill bits combine premium materials, precision manufacturing, and user-centric design to meet the most demanding production and job-site requirements.
The unique dual-flute (double ligament) geometry sets this drill bit apart, making it the ideal solution for clean, burr-free holes in both soft and hard materials, with superior chip management and reduced tool wear.
Core Design & Material Advantages
Patented Double Flute (Dual-Lip) Geometry
The signature double flute design delivers game-changing performance benefits:
- Superior Chip Evacuation: Wider, optimized flutes create unobstructed channels for fast, efficient chip removal, preventing clogging even during deep-hole drilling and high-speed continuous operation. This eliminates heat buildup, extends tool life, and ensures consistent hole quality.
- Enhanced Stability & Reduced Runout: The dual-lip cutting structure provides balanced radial support, minimizing drill bit wander and radial runout during penetration. This results in perfectly round, straight holes with zero deviation, eliminating the need for secondary finishing work.
- Faster Cutting Speeds: The optimized flute angle and cutting edge geometry reduce cutting resistance, allowing for higher drilling speeds without sacrificing precision, significantly boosting production efficiency.
Premium Industrial-Grade Materials
We offer multiple material options to match your application needs, with our flagship line featuring HSS M35 /HSS M2 / HSS 4341 / HSS 4241 high-speed steel (custom material grades available upon request):
- Exceptional red hardness and wear resistance, maintaining cutting edge sharpness even under continuous high-temperature drilling
- Superior toughness and impact resistance, reducing breakage risk in heavy-duty, high-stress applications
- Optimal balance of performance and cost-effectiveness, perfect for bulk industrial use
Advanced Surface Treatment
Available with black oxide / TiN (Titanium Nitride) / TiAlN coating (custom finishes available):
- Black oxide finish: Enhances corrosion resistance, reduces friction, and improves heat dissipation for general-purpose metal drilling
- TiN/TiAlN coating: Boosts surface hardness by 3x+, extends tool life by 2-5x, and enables high-speed dry drilling in hard metals (stainless steel, alloy steel)
- Smooth, low-friction surface for smoother penetration and reduced workpiece damage
B2B-Focused Supply Solutions
We are a professional industrial cutting tool manufacturer, dedicated to supporting global B2B partners with flexible, reliable supply solutions:
- Bulk Order Support: Large-volume production capacity to meet your wholesale and distribution needs, with competitive factory-direct pricing
- Customization Services: OEM/ODM support for custom sizes, coatings, packaging, private labeling, and logo printing to match your brand
- Stable Inventory & Fast Delivery: Full stock of standard sizes for immediate shipment, with guaranteed lead times for custom orders
- Quality Assurance: Every batch undergoes strict dimensional, hardness, and cutting performance testing, with full test reports and compliance certifications (RoHS, ISO) provided
- Dedicated B2B Support: Professional technical team for pre-sales consultation, application guidance, and after-sales service
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Application
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HSS Grade
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Iron
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Aluminum
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Carbon Steel
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Tile
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Plastic
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Stainless Steel
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4241
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YES
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YES
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NO
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NO
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YES
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NO
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| 4341 | YES | YES | YES | NO | YES | YES |
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6542(M2)
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YES
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YES
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YES
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NO
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YES
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GOOD
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M35 (Co 5%)
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YES
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YES
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YES
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NO
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YES
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VERY GOOD
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| DESCRIPTION OF HSS | C | W | Mo | Cr | V | Co | Si | Mn | P | S |
| % | % | % | % | % | % | % | % | % | % | |
| W4Mo3Cr4V(4341) | 0.88-0.98 | 3.5-4.5 | 2.5-3.5 | 3.8-4.4 | 1.2-1.8 | 0.5-1.2 | 0.2-0.4 | <=0.03 | <=0.03 | |
| W6Mo5Cr4V2(M2) | 0.8-0.9 | 5.5-6.75 | 4.5-5.5 | 3.8-4.4 | 1.75-2.2 | – | 0.2-0.4 | 0.2-0.4 | <=0.03 | <=0.03 |
| W6Mo5Cr4V2Co5(M35) | 0.9-0.95 | 5.5-6.5 | 4.5-5.5 | 3.8-4.4 | 1.75-2.2 | 4.5-5.5 | 0.2-0.4 | 0.2-0.4 | <=0.03 | <=0.03 |
| W2Mo9Cr4V2Co8(M42) | 1.05-1.15 | 1.15-1.85 | 9.0-10.0 | 3.5-4.25 | 0.95-1.25 | 7.75-8.75 | 0.15-0.65 | 0.15-0.4 | <=0.02 | <=0.025 |
| DIA. | OVERALL LENGTH (INCH) | WORKING LENGTH (INCH) | DIA. | OVERALL | WORKING LENGTH (INCH) | DIA. | OVERALL | WORKING LENGTH (INCH) |
| 1/64″ | 3/4″ | 3/16″ | 15# | 3-3/8″ | 2-3/16″ | 61# | 1-/5/8″ | 11/16″ |
| 1/32″ | 1-3/8″ | 1/2″ | 16# | 3-3/8″ | 2-3/16″ | 62# | 1-1/2″ | 5/8″ |
| 3/64″ | 1-3/4″ | 3/4″ | 17# | 3-3/8″ | 2-3/16″ | 63# | 1-1/2″ | 5/8″ |
| 1/16″ | 1-7/8″ | 7/8″ | 18# | 3-1/4″ | 2-1/8″ | 64# | 1-1/2″ | 5/8″ |
| 5/64″ | 2″ | 1″ | 19# | 3-1/4″ | 2-1/8″ | 65# | 1-1/2″ | 5/8″ |
| 3/32″ | 2-1/4″ | 1-1/4″ | 20# | 3-1/4″ | 2-1/8″ | 66# | 1-3/8″ | 1/2″ |
| 7/64″ | 2-5/8″ | 1-1/2″ | 21# | 3-1/4″ | 2-1/8″ | 67# | 1-3/8″ | 1/2″ |
| 1/8″ | 2-3/4″ | 1-5/8″ | 22# | 3-1/8″ | 2″ | 68# | 1-3/8″ | 1/2″ |
| 9/64″ | 2-7/8″ | 1-3/4″ | 23# | 3-1/8″ | 2” | 69# | 1-3/8″ | 1/2″ |
| 5/32″ | 3-1/8″ | 2″ | 24# | 3-1/8″ | 2″ | 70# | 1-1/4″ | 3/8″ |
| 11/64″ | 3-1/4″ | 2-1/8″ | 25# | 3″ | 1-7/8” | 71# | 1-1/4″ | 3/8″ |
| 3/16″ | 3-1/2″ | 2-5/16″ | 26# | 3″ | 1-7/8″ | 72# | 1-1/8″ | 5/16″ |
| 13/64″ | 3-5/8″ | 2-7/16″ | 27# | 3” | 1-7/8″ | 73# | 1-1/8″ | 5/16″ |
| 7/32″ | 3-3/4″ | 2-1/2″ | 28# | 2-7/8″ | 1-3/4″ | 74# | 1″ | 1/4″ |
| 15/64″ | 3-7/8″ | 2-5/8″ | 29# | 2-7/8″ | 1-3/4″ | 75# | 1″ | 1/4″ |
| 1/4″ | 4″ | 2-3/4″ | 30# | 2-3/4″ | 1-5/8″ | 76# | 7/8″ | 3/16″ |
| 17/64″ | 4-1/8″ | 2-7/8″ | 31# | 2-3/4″ | 1-5/8″ | 77# | 7/8″ | 3/16″ |
| 9/32″ | 4-1/4″ | 2-15/16″ | 32# | 2-3/4″ | 1-5/8″ | 78# | 7/8″ | 3/16″ |
| 19/64″ | 4-3/8″ | 3-1/16″ | 33# | 2-5/8″ | 1-1/2″ | 79# | 3/4″ | 1/8″ |
| 5/16″ | 4-1/2″ | 3-3/16″ | 34# | 2-5/8″ | 1-1/2″ | 80# | 3/4″ | 1/8″ |
| 21/64″ | 4-5/8″ | 3-5/16″ | 35# | 2-5/8″ | 1-1/2″ | A | 3-/7/8″ | 2-5/8″ |
| 11/32″ | 4-3/4″ | 3-7/16″ | 36# | 2-1/2″ | 1-7/16″ | B | 4″ | 2-3/4″ |
| 23/64″ | 4-7/8″ | 3-1/2″ | 37# | 2-1/2″ | 1-7/16″ | C | 4″ | 2-3/4″ |
| 3/8″ | 5″ | 3-5/8″ | 38# | 2-1/2″ | 1-7/16″ | D | 4″ | 2-3/4″ |
| 25/64″ | 5-1/8″ | 3-3/4″ | 39# | 2-3/8″ | 1-3/8” | E | 4″ | 2-3/4″ |
| 13/32″ | 5-1/4″ | 3-7/8″ | 40# | 2-3/8″ | 1-3/8″ | F | 4-/1/8″ | 2-7/8″ |
| 27/64″ | 5-3/8″ | 3-15/16″ | 41# | 2-3/8″ | 1-3/8″ | G | 4-/1/8″ | 2-7/8″ |
| 7/16″ | 5-1/2″ | 4-1/16″ | 42# | 2-1/4″ | 1-1/4″ | H | 4-/1/8″ | 2-7/8″ |
| 29/64″ | 5-5/8″ | 4-3/16″ | 43# | 2-1/4″ | 1-1/4″ | I | 4-1/8” | 2-7/8″ |
| 15/32″ | 5-3/4″ | 4-5/16″ | 44# | 2-1/8″ | 1-1/8″ | J | 4-/1/8″ | 2-7/8″ |
| 31/64″ | 5-7/8″ | 4-3/8″ | 45# | 2-1/8″ | 1-1/8″ | K | 4-/1/4″ | 2-15/16″ |
| 1/2″ | 6″ | 4-1/2″ | 46# | 2-1/8″ | 1-1/8″ | L | 4-/1/4″ | 2-15/16″ |
| 1# | 3-7/8″ | 2-5/8″ | 47# | 2″ | 1″ | M | 4-3/8″ | 3-1/16″ |
| 2# | 3-7/8″ | 2-5/8″ | 48# | 2″ | 1″ | N | 4-3/8″ | 3-1/16″ |
| 3# | 3-3/4″ | 2-1/2″ | 49# | 2″ | 1″ | O | 4-1/2″ | 3-3/16″ |
| 4# | 3-3/4″ | 2-1/2″ | 50# | 2″ | 1″ | P | 4-5/8″ | 3-5/16″ |
| 5# | 3-3/4″ | 2-1/2″ | 51# | 2″ | 1″ | Q | 4-3/4″ | 3-7/16″ |
| 6# | 3-3/4″ | 2-1/2″ | 52# | 1-7/8″ | 7/8″ | R | 4-3/4″ | 3-7/16″ |
| 7# | 3-5/8″ | 2-7/16″ | 53# | 1-7/8″ | 7/8″ | S | 4-7/8″ | 3-1/2″ |
| 8# | 3-5/8″ | 2-7/16″ | 54# | 1-7/8″ | 7/8″ | T | 4-7/8″ | 3-1/2″ |
| 9# | 3-5/8″ | 2-7/16″ | 55# | 1-7/8″ | 7/8″ | U | 5″ | 3-5/8″ |
| 10# | 3-5/8″ | 2-7/16″ | 56# | 1-3/4″ | 3/4″ | V | 5″ | 3-5/8″ |
| 11# | 3-1/2″ | 2-5/16″ | 57# | 1-3/4″ | 3/4″ | W | 5-1/8″ | 3-3/4″ |
| 12# | 3-1/2″ | 2-5/16″ | 58# | 1-5/8″ | 11/16″ | X | 5-1/8″ | 3-3/4″ |
| 13# | 3-1/2″ | 2-5/16″ | 59# | 1-5/8″ | 11/16″ | Y | 5-1/4″ | 3-7/8″ |
| 14# | 3-3/8″ | 2-3/16″ | 60# | 1-5/8″ | 11/16″ | Z | 5-1/4″ | 3-7/8″ |
