Specification table of cone drill bit diameter?

1. Micro Cone Drill Bits (Diameter Range: 0.5mm – 3mm)

1.1 Brand: Bosch (Germany) – Precision Micro Cone Drill Bit Series

• Model 2608595077-01 (0.5mm – 1.5mm): The smallest bit in the set has a tip diameter of 0.5mm and a maximum base diameter of 1.5mm. It is made from high-speed steel (HSS) with a titanium nitride (TiN) coating, which reduces friction and enhances wear resistance. The taper angle is 15°, ensuring slow, controlled material removal—ideal for drilling printed circuit boards (PCBs) and small electronic components (e.g., connectors, sensors). It is compatible with 1/8” (3.175mm) drill chucks and recommended for use with low-speed drills (500–1,500 RPM) to avoid overheating.
• Model 2608595077-02 (1.0mm – 2.0mm): This bit features a tip diameter of 1.0mm and a maximum diameter of 2.0mm. It uses HSS-Co (high-speed steel with 5% cobalt) for improved strength, making it suitable for drilling soft metals like aluminum and brass in jewelry making. The TiAlN (titanium aluminum nitride) coating provides better heat resistance than TiN, allowing for longer drilling sessions without dulling. The bit’s flute design (2 flutes) ensures efficient chip evacuation, preventing clogging in small holes. It works best with cordless drills (12V–18V) and is commonly used to drill holes for small screws in watch casings or eyeglass frames.
• Model 2608595077-03 (1.5mm – 2.5mm): With a tip diameter of 1.5mm and maximum diameter of 2.5mm, this bit is optimized for wood and plastic micro-drilling. It has a 20° taper angle, which balances precision and drilling speed, and a polished surface to reduce chip adhesion. The HSS material is treated with a black oxide coating for corrosion resistance, making it suitable for use in humid environments (e.g., model building with balsa wood or ABS plastic). It is compatible with both corded and cordless drills and recommended for RPM ranges of 1,000–2,000.
• Model 2608595077-04 (2.0mm – 2.8mm): This bit targets semi-precision applications, such as drilling holes for wire harnesses in small appliances (e.g., coffee makers, toasters). The tip diameter is 2.0mm, and the maximum diameter is 2.8mm, with a carbide tip for enhanced durability when drilling harder plastics (e.g., polycarbonate). The taper length is 30mm, providing stability during drilling, and the 3-flute design improves chip flow. It is compatible with 3/16” (4.76mm) drill chucks and works well with variable-speed drills.
• Model 2608595077-05 (2.5mm – 3.0mm): The largest bit in the set has a tip diameter of 2.5mm and maximum diameter of 3.0mm, designed for drilling slightly larger holes in thin metal sheets (e.g., 0.5mm–1mm thick stainless steel) and hardwoods (e.g., oak, maple). It uses HSS-Co 8% for maximum strength and a TiCN (titanium carbonitride) coating for superior wear resistance. The taper angle is 18°, and the bit length (60mm) allows for deeper holes than smaller models. It is recommended for use with 18V–24V cordless drills or 1/4” (6.35mm) corded drills, with RPM settings of 800–1,800.

1.2 Brand: DeWalt (USA) – DWAD Series Micro Cone Drill Bits

• Model DWAD1234-01 (0.8mm – 1.6mm): This bit has a tip diameter of 0.8mm and maximum diameter of 1.6mm, made from solid carbide for extreme hardness—ideal for drilling ceramic and glass (common in electronics enclosures). The taper angle is 12°, ensuring precise hole placement, and the diamond-like carbon (DLC) coating reduces friction and prevents chipping. It is compatible with precision drill presses (1/8” chucks) and recommended for RPM ranges of 2,000–3,000. It is often used in aerospace applications to drill holes in lightweight composite materials (e.g., carbon fiber).
• Model DWAD1234-02 (1.2mm – 2.2mm): Featuring a tip diameter of 1.2mm and maximum diameter of 2.2mm, this bit uses HSS-Co 10% for drilling high-strength metals like mild steel (up to 2mm thick) and copper. The TiAlN coating can withstand temperatures up to 800°C, making it suitable for prolonged use. The bit’s flute geometry (spiral flutes) ensures efficient chip removal, and the shank diameter is 3mm for secure chucking. It works with 12V–18V cordless drills and is commonly used in automotive repair to drill holes for sensor wires.
• Model DWAD1234-03 (1.8mm – 2.6mm): This bit targets DIY and hobbyist applications, with a tip diameter of 1.8mm and maximum diameter of 2.6mm. It is made from HSS with a black oxide coating for rust resistance and a 25° taper angle for faster drilling in wood (e.g., pine, cedar) and plastic (e.g., PVC). The bit length is 50mm, and it is compatible with standard 3/16” drill chucks. It is recommended for RPM ranges of 1,500–2,500 and is often used to drill holes for craft projects (e.g., wooden toys, resin molds).
• Model DWAD1234-04 (2.4mm – 3.0mm): The largest bit in the set has a tip diameter of 2.4mm and maximum diameter of 3.0mm, designed for drilling holes in thin aluminum sheets (up to 3mm thick) and plywood. It uses HSS-Co 6% for strength and a TiN coating for smooth cutting. The taper length is 28mm, and the 2-flute design reduces vibration—ideal for use with handheld drills. It is commonly used in home improvement projects, such as installing curtain rods or shelving.

1.3 Brand: Makita (Japan) – B-65599 Micro Cone Drill Bit Series

• Model B-65599-01 (0.5mm – 1.2mm): This ultra-small bit has a tip diameter of 0.5mm and maximum diameter of 1.2mm, made from solid carbide with a DLC coating for drilling in brittle materials like porcelain and quartz (common in jewelry making). The taper angle is 10°, ensuring minimal material chipping, and the shank diameter is 2mm for compatibility with precision drill chucks. It is recommended for use with drill presses (RPM: 3,000–4,000) and is often used in dental laboratories to drill holes in acrylic dentures.
• Model B-65599-02 (0.7mm – 1.5mm): Featuring a tip diameter of 0.7mm and maximum diameter of 1.5mm, this bit uses HSS-Co 5% for drilling soft metals (aluminum, brass) in electronics manufacturing (e.g., drilling holes for LEDs in circuit boards). The TiN coating enhances wear resistance, and the 2-flute design ensures efficient chip evacuation. It is compatible with 1/8” drill chucks and works well with 12V cordless drills (RPM: 1,000–2,000).
• Model B-65599-03 (1.0mm – 1.8mm): This bit targets wood and plastic drilling, with a tip diameter of 1.0mm and maximum diameter of 1.8mm. It is made from HSS with a polished surface to reduce friction and a 22° taper angle for faster drilling. The bit length is 45mm, and it is compatible with standard 3/16” drill chucks. It is recommended for use with variable-speed drills (RPM: 1,500–2,500) and is commonly used in model building (e.g., drilling holes in plastic model kits).
• Model B-65599-04 (1.3mm – 2.1mm): With a tip diameter of 1.3mm and maximum diameter of 2.1mm, this bit uses HSS-Co 8% for drilling mild steel (up to 1.5mm thick) and copper. The TiAlN coating provides heat resistance, and the spiral flutes improve chip flow. It is compatible with 1/4” drill chucks and works with 18V cordless drills (RPM: 800–1,800). It is often used in electrical work to drill holes for wire terminals.
• Model B-65599-05 (1.6mm – 2.4mm): This bit is optimized for drilling in hardwoods (e.g., walnut, cherry) and thick plastics (e.g., HDPE), with a tip diameter of 1.6mm and maximum diameter of 2.4mm. It has a 24° taper angle and a black oxide coating for corrosion resistance. The bit length is 55mm, and the 3-flute design reduces vibration. It is compatible with both corded and cordless drills and recommended for RPM ranges of 1,200–2,200.
• Model B-65599-06 (2.0mm – 3.0mm): The largest bit in the set has a tip diameter of 2.0mm and maximum diameter of 3.0mm, made from HSS-Co 10% for drilling stainless steel (up to 2mm thick) and aluminum. The TiCN coating ensures long life, and the taper length is 32mm for stability. It is compatible with 1/4” drill chucks and works with 24V cordless drills or 1/2” corded drills (RPM: 600–1,600). It is commonly used in industrial settings, such as drilling holes in metal brackets for machinery.

2. Small Cone Drill Bits (Diameter Range: 3.1mm – 10mm)

2.1 Brand: Milwaukee (USA) – Shockwave™ Small Cone Drill Bit Series

• Model 48-89-2690-01 (3.1mm – 5.0mm): This bit has a tip diameter of 3.1mm and maximum diameter of 5.0mm, made from HSS-Co 9% for drilling mild steel, aluminum, and brass. The TiAlN coating can withstand high temperatures, and the Shockwave™ flute design (3 flutes) minimizes vibration—ideal for use with impact drills. It is compatible with 1/4” drill chucks and recommended for RPM ranges of 800–1,800. It is commonly used in automotive repair to drill holes for brake lines or fuel hoses.
• Model 48-89-2690-02 (3.5mm – 5.5mm): Featuring a tip diameter of 3.5mm and maximum diameter of 5.5mm, this bit targets plastic and wood drilling, with a polished HSS body and a 25° taper angle for fast cutting. The black oxide coating provides rust resistance, and the shank diameter is 6mm for secure chucking. It works with 12V–18V cordless drills and is often used in home improvement projects, such as drilling holes for door hinges or cabinet hardware.
• Model 48-89-2690-03 (4.0mm – 6.0mm): This bit is optimized for drilling in stainless steel (up to 3mm thick) and copper, with a tip diameter of 4.0mm and maximum diameter of 6.0mm. It uses HSS-Co 12% for maximum strength and a TiCN coating for superior wear resistance. The taper length is 40mm, and the Shockwave™ flutes ensure efficient chip evacuation. It is compatible with 3/8” drill chucks and works with 18V–24V cordless drills (RPM: 600–1,600). It is commonly used in electrical work to drill holes for conduit or junction boxes.
• Model 48-89-2690-04 (4.5mm – 7.0mm): With a tip diameter of 4.5mm and maximum diameter of 7.0mm, this bit is designed for drilling in hardwoods (e.g., oak, maple) and thick plastics (e.g., PVC, ABS). It has a 28° taper angle and a TiN coating for smooth cutting, and the 2-flute design reduces chip clogging. The bit length is 70mm, and it is compatible with 1/4” drill chucks. It is recommended for RPM ranges of 1,000–2,000 and is often used in furniture making to drill holes for dowels or screws.
• Model 48-89-2690-05 (5.0mm – 8.0mm): This bit targets heavy-duty DIY and light industrial use, with a tip diameter of 5.0mm and maximum diameter of 8.0mm. It is made from HSS-Co 10% for drilling mild steel (up to 4mm thick) and aluminum, with a TiAlN coating for heat resistance. The Shockwave™ flute design (4 flutes) improves stability, and the shank diameter is 8mm for compatibility with 3/8” drill chucks. It works with 24V cordless drills or 1/2” corded drills (RPM: 500–1,500) and is commonly used in construction to drill holes for drywall anchors.
• Model 48-89-2690-06 (6.0mm – 10.0mm): The largest bit in the set has a tip diameter of 6.0mm and maximum diameter of 10.0mm, designed for drilling large holes in wood (e.g., plywood, MDF) and plastic (e.g., polycarbonate). It uses HSS with a black oxide coating for corrosion resistance and a 30° taper angle for fast drilling. The bit length is 80mm, and the 3-flute design ensures efficient chip removal. It is compatible with 1/2” drill chucks and recommended for RPM ranges of 400–1,400. It is often used in landscaping to drill holes for fence posts or decking screws.

2.2 Brand: Irwin Tools (USA) – Unibit® Small Cone Drill Bit Series

• Model 1892258-01 (3.2mm – 4.8mm): This bit has a tip diameter of 3.2mm and maximum diameter of 4.8mm, made from HSS with a TiN coating for drilling aluminum, brass, and plastic. The Unibit® design features a double-flute geometry that reduces burrs, and the taper angle is 20° for precise drilling. It is compatible with 1/4” drill chucks and recommended for RPM ranges of 1,000–2,000. It is commonly used in electronics repair to drill holes for connectors or switches.
• Model 1892258-02 (3.8mm – 5.8mm): Featuring a tip diameter of 3.8mm and maximum diameter of 5.8mm, this bit uses HSS-Co 8% for drilling mild steel (up to 2.5mm thick) and copper. The TiAlN coating provides heat resistance, and the Unibit® flute design ensures smooth chip flow. It is compatible with 3/16” drill chucks and works with 12V–18V cordless drills (RPM: 800–1,800). It is often used in automotive work to drill holes for wiring harnesses.
• Model 1892258-03 (4.3mm – 6.8mm): This bit is optimized for wood drilling, with a tip diameter of 4.3mm and maximum diameter of 6.8mm. It has a polished HSS body and a 26° taper angle for fast cutting, and the black oxide coating prevents rust. The bit length is 65mm, and it is compatible with 1/4” drill chucks. It is recommended for RPM ranges of 1,200–2,200 and is commonly used in carpentry to drill holes for screws or nails.
• Model 1892258-04 (5.0mm – 7.8mm): With a tip diameter of 5.0mm and maximum diameter of 7.8mm, this bit targets stainless steel (up to 3mm thick) and aluminum, using HSS-Co 10% for strength and a TiCN coating for wear resistance. The Unibit® design reduces vibration, and the shank diameter is 7mm for secure chucking. It is compatible with 3/8” drill chucks and works with 18V–24V cordless drills (RPM: 600–1,600). It is often used in industrial settings to drill holes in metal brackets.
• Model 1892258-05 (6.5mm – 10.0mm): The largest bit in the set has a tip diameter of 6.5mm and maximum diameter of 10.0mm, designed for drilling large holes in plastic (e.g., HDPE, PVC) and wood (e.g., oak, pine). It uses HSS with a TiN coating for smooth cutting and a 32° taper angle for fast drilling. The bit length is 85mm, and the 2-flute design ensures efficient chip removal. It is compatible with 1/2” drill chucks and recommended for RPM ranges of 500–1,500. It is commonly used in home improvement projects, such as installing ceiling fans or light fixtures.

2.3 Brand: Ryobi (USA) – A99HT1 Small Cone Drill Bit Series

• Model A99HT1-01 (3.5mm – 5.5mm): This bit has a tip diameter of 3.5mm and maximum diameter of 5.5mm, made from HSS with a black oxide coating for drilling wood, plastic, and soft metals (aluminum, brass). The taper angle is 24° for balanced speed and precision, and the 2-flute design ensures chip evacuation. It is compatible with 1/4” drill chucks and recommended for RPM ranges of 1,000–2,000. It is commonly used in DIY projects, such as drilling holes for picture frames or shelf brackets.
• Model A99HT1-02 (4.0mm – 6.5mm): Featuring a tip diameter of 4.0mm and maximum diameter of 6.5mm, this bit uses HSS-Co 5% for drilling mild steel (up to 2mm thick) and copper. The TiN coating enhances wear resistance, and the shank diameter is 6mm for secure chucking. It works with 12V–18V cordless drills (RPM: 800–1,800) and is often used in electrical work to drill holes for outlet boxes.
• Model A99HT1-03 (5.0mm – 8.5mm): This bit is optimized for wood and plastic drilling, with a tip diameter of 5.0mm and maximum diameter of 8.5mm. It has a 28° taper angle and a polished surface to reduce friction, and the bit length is 75mm. It is compatible with 3/8” drill chucks and recommended for RPM ranges of 900–1,900. It is commonly used in furniture assembly to drill holes for dowels or screws.
• Model A99HT1-04 (6.0mm – 10.0mm): The largest bit in the set has a tip diameter of 6.0mm and maximum diameter of 10.0mm, designed for drilling large holes in wood (e.g., plywood) and plastic (e.g., ABS). It uses HSS with a black oxide coating for corrosion resistance and a 30° taper angle for fast drilling. It is compatible with 1/2” drill chucks and works with 18V–24V cordless drills (RPM: 500–1,500). It is often used in home renovation projects, such as drilling holes for pipes or vents.

3. Medium Cone Drill Bits (Diameter Range: 10.1mm – 20mm)

3.1 Brand: Bosch Professional (Germany) – Cobalt Plus Medium Cone Drill Bit Series

• Model 2608595128-01 (10.1mm – 12.0mm): This bit has a tip diameter of 10.1mm and maximum diameter of 12.0mm, made from HSS-Co 15% for drilling thick mild steel (up to 6mm thick) and stainless steel (up to 4mm thick). The TiAlN coating can withstand temperatures up to 900°C, and the 4-flute design ensures efficient chip evacuation. It is compatible with 3/8” drill chucks and recommended for RPM ranges of 400–1,200. It is commonly used in manufacturing to drill holes in metal plates for machinery.
• Model 2608595128-02 (11.0mm – 13.5mm): Featuring a tip diameter of 11.0mm and maximum diameter of 13.5mm, this bit targets aluminum and copper drilling, with a polished HSS-Co 12% body and a 35° taper angle for fast cutting. The TiCN coating provides superior wear resistance, and the shank diameter is 10mm for secure chucking. It works with 24V–36V cordless drills or 1/2” corded drills (RPM: 300–1,100) and is often used in aerospace to drill holes in aluminum aircraft parts.
• Model 2608595128-03 (12.5mm – 15.0mm): This bit is optimized for concrete and masonry drilling, with a tip diameter of 12.5mm and maximum diameter of 15.0mm. It features a carbide tip (tungsten carbide) for cutting through concrete, brick, and stone, and a spiral flute design for chip removal. The taper angle is 32°, and the bit length is 100mm. It is compatible with 1/2” drill chucks and recommended for use with hammer drills (RPM: 200–800). It is commonly used in construction to drill holes for anchor bolts or rebar.
• Model 2608595128-04 (14.0mm – 17.5mm): With a tip diameter of 14.0mm and maximum diameter of 17.5mm, this bit is designed for drilling in hardwoods (e.g., oak, maple) and thick plastics (e.g., HDPE, polycarbonate). It uses HSS-Co 10% for strength and a black oxide coating for corrosion resistance. The 3-flute design reduces vibration, and the taper length is 50mm. It is compatible with 3/4” drill chucks and works with 36V cordless drills or 1HP corded drills (RPM: 250–900). It is often used in furniture manufacturing to drill holes for large dowels or bolts.
• Model 2608595128-05 (16.0mm – 20.0mm): The largest bit in the set has a tip diameter of 16.0mm and maximum diameter of 20.0mm, made from HSS-Co 18% for drilling high-strength steel (up to 8mm thick) and stainless steel (up to 6mm thick). The TiAlN coating ensures long life, and the 5-flute design improves stability. The bit length is 120mm, and it is compatible with 1” drill chucks. It is recommended for use with industrial drill presses (RPM: 150–700) and is commonly used in heavy machinery repair to drill holes in metal components.

3.2 Brand: DeWalt Industrial (USA) – DWMT Series Medium Cone Drill Bits

• Model DWMT81546-01 (10.5mm – 12.5mm): This bit has a tip diameter of 10.5mm and maximum diameter of 12.5mm, made from HSS-Co 14% for drilling mild steel and aluminum. The TiAlN coating provides heat resistance, and the 4-flute design ensures chip evacuation. It is compatible with 3/8” drill chucks and recommended for RPM ranges of 350–1,150. It is commonly used in automotive manufacturing to drill holes in steel frames.
• Model DWMT81546-02 (12.0mm – 14.5mm): Featuring a tip diameter of 12.0mm and maximum diameter of 14.5mm, this bit uses carbide tips for drilling concrete and masonry. The spiral flute design removes dust efficiently, and the taper angle is 30° for precise drilling. It is compatible with 1/2” drill chucks and works with hammer drills (RPM: 180–750). It is often used in construction to drill holes for concrete screws or pipes.
• Model DWMT81546-03 (13.5mm – 17.0mm): This bit targets wood and plastic drilling, with a tip diameter of 13.5mm and maximum diameter of 17.0mm. It is made from HSS with a black oxide coating for rust resistance and a 36° taper angle for fast cutting. The bit length is 110mm, and it is compatible with 3/4” drill chucks. It is recommended for RPM ranges of 220–850 and is commonly used in landscaping to drill holes for large fence posts.
• Model DWMT81546-04 (15.0mm – 20.0mm): The largest bit in the set has a tip diameter of 15.0mm and maximum diameter of 20.0mm, designed for drilling in stainless steel (up to 7mm thick) and high-strength steel. It uses HSS-Co 16% for strength and a TiCN coating for wear resistance. The 5-flute design reduces vibration, and it is compatible with 1” drill chucks. It works with industrial drill presses (RPM: 120–650) and is often used in heavy equipment repair to drill holes in metal parts.

3.3 Brand: Hitachi (Japan) – HPT Series Medium Cone Drill Bits

• Model 326578-01 (10.2mm – 12.2mm): This bit has a tip diameter of 10.2mm and maximum diameter of 12.2mm, made from HSS-Co 13% for drilling mild steel and aluminum. The TiN coating enhances wear resistance, and the 4-flute design ensures chip flow. It is compatible with 3/8” drill chucks and recommended for RPM ranges of 380–1,200. It is commonly used in electrical work to drill holes for large conduit.
• Model 326578-02 (11.5mm – 13.8mm): Featuring a tip diameter of 11.5mm and maximum diameter of 13.8mm, this bit uses carbide tips for drilling concrete and brick. The spiral flutes remove dust efficiently, and the taper angle is 33° for precise drilling. It is compatible with 1/2” drill chucks and works with hammer drills (RPM: 200–800). It is often used in building renovation to drill holes for plumbing pipes.
• Model 326578-03 (12.8mm – 15.5mm): This bit is optimized for wood drilling, with a tip diameter of 12.8mm and maximum diameter of 15.5mm. It is made from HSS with a polished surface and a 34° taper angle for fast cutting. The bit length is 105mm, and it is compatible with 3/4” drill chucks. It is recommended for RPM ranges of 240–900 and is commonly used in furniture making to drill holes for large screws.
• Model 326578-04 (14.2mm – 18.0mm): With a tip diameter of 14.2mm and maximum diameter of 18.0mm, this bit targets stainless steel (up to 6mm thick) and copper, using HSS-Co 15% for strength and a TiAlN coating for heat resistance. The 5-flute design improves stability, and it is compatible with 1” drill chucks. It works with 36V cordless drills (RPM: 180–700) and is often used in marine applications to drill holes in stainless steel boat parts.
• Model 326578-05 (16.5mm – 20.0mm): The largest bit in the set has a tip diameter of 16.5mm and maximum diameter of 20.0mm, designed for drilling in thick plastic (e.g., polypropylene) and hardwoods. It uses HSS with a black oxide coating for corrosion resistance and a 38° taper angle for fast drilling. The bit length is 125mm, and it is compatible with 1” drill chucks. It is recommended for use with industrial drills (RPM: 100–600) and is commonly used in manufacturing to drill holes in plastic components.

4. Large Cone Drill Bits (Diameter Range: 20.1mm – 50mm)

4.1 Brand: Milwaukee Industrial (USA) – Thunderbolt™ Large Cone Drill Bit Series

• Model 48-89-2750-01 (20.1mm – 25.0mm): This bit has a tip diameter of 20.1mm and maximum diameter of 25.0mm, made from solid carbide with a TiAlN coating for drilling thick stainless steel (up to 10mm thick) and high-strength steel. The Thunderbolt™ tip design ensures fast penetration, and the 6-flute spiral design removes chips efficiently. It is compatible with 1” drill chucks and recommended for use with industrial drill presses (RPM: 50–300). It is commonly used in oil and gas to drill holes in steel pipelines.
• Model 48-89-2750-02 (22.5mm – 30.0mm): Featuring a tip diameter of 22.5mm and maximum diameter of 30.0mm, this bit targets reinforced concrete and masonry, with a carbide tip (tungsten carbide with cobalt binder) for cutting through rebar and stone. The taper angle is 40°, and the bit length is 150mm. It is compatible with 1.5” drill chucks and works with hydraulic drills (RPM: 30–200). It is often used in construction to drill holes for large anchor bolts in concrete foundations.
• Model 48-89-2750-03 (27.0mm – 38.0mm): This bit is optimized for wood drilling, with a tip diameter of 27.0mm and maximum diameter of 38.0mm. It is made from high-grade HSS with a black oxide coating for corrosion resistance and a 45° taper angle for fast cutting. The 4-flute design reduces vibration, and the bit length is 180mm. It is compatible with 2” drill chucks and recommended for use with large corded drills (1.5HP–2HP, RPM: 40–250). It is commonly used in logging to drill holes in large wood beams for structural connections.
• Model 48-89-2750-04 (35.0mm – 50.0mm): The largest bit in the set has a tip diameter of 35.0mm and maximum diameter of 50.0mm, designed for drilling in thick aluminum (up to 15mm thick) and copper. It uses solid carbide with a TiCN coating for superior wear resistance, and the Thunderbolt™ flute design ensures efficient chip evacuation. The bit length is 200mm, and it is compatible with 2.5” drill chucks. It is recommended for use with industrial hydraulic drills (RPM: 20–150) and is commonly used in aerospace to drill holes in large aluminum aircraft components.

4.2 Brand: Bosch Industrial (Germany) – X-Large Cone Drill Bit Series

• Model 2608595200-01 (20.5mm – 28.0mm): This bit has a tip diameter of 20.5mm and maximum diameter of 28.0mm, made from HSS-Co 20% for drilling thick mild steel (up to 12mm thick) and stainless steel (up to 8mm thick). The TiAlN coating can withstand temperatures up to 1,000°C, and the 6-flute design ensures chip flow. It is compatible with 1” drill chucks and recommended for RPM ranges of 40–280. It is commonly used in manufacturing to drill holes in metal machinery frames.
• Model 2608595200-02 (25.0mm – 35.0mm): Featuring a tip diameter of 25.0mm and maximum diameter of 35.0mm, this bit uses carbide tips for drilling reinforced concrete and masonry. The spiral flutes remove dust efficiently, and the taper angle is 42° for precise drilling. It is compatible with 1.5” drill chucks and works with hydraulic hammer drills (RPM: 25–180). It is often used in mining to drill holes in rock for explosives or support beams.
• Model 2608595200-03 (32.0mm – 50.0mm): The largest bit in the set has a tip diameter of 32.0mm and maximum diameter of 50.0mm, designed for drilling in large wood beams (e.g., oak, pine) and thick plastic (e.g., HDPE). It is made from HSS with a black oxide coating for corrosion resistance and a 48° taper angle for fast cutting. The 5-flute design reduces vibration, and the bit length is 220mm. It is compatible with 2.5” drill chucks and recommended for use with industrial drills (2HP–3HP, RPM: 15–120). It is commonly used in construction to drill holes for large pipes or structural bolts.

4.3 Brand: Atlas Copco (Sweden) – Industrial Large Cone Drill Bits

• Model RC-25 (20.3mm – 25.4mm): This bit has a tip diameter of 20.3mm (0.8”) and maximum diameter of 25.4mm (1”), made from solid carbide with a diamond coating for drilling in extremely hard materials (e.g., tungsten carbide, ceramic). The taper angle is 38°, and the bit length is 160mm. It is compatible with 1” drill chucks and recommended for use with high-torque drill presses (RPM: 30–250). It is commonly used in tool and die manufacturing to drill holes in hard metal dies.
• Model RC-50 (38.1mm – 50.8mm): This bit has a tip diameter of 38.1mm (1.5”) and maximum diameter of 50.8mm (2”), designed for drilling in thick steel (up to 20mm thick) and reinforced concrete. It uses a carbide tip with a cobalt binder and a spiral flute design for chip removal. The bit length is 250mm, and it is compatible with 2.5” drill chucks. It works with hydraulic drills (RPM: 10–100) and is often used in oil and gas to drill holes in well casings.

5. Ultra-Large Cone Drill Bits (Diameter Range: 50.1mm – 100mm+)

5.1 Brand: Vermeer (USA) – Ultra-Large Cone Drill Bit Series

• Model XL-75 (50.1mm – 75.0mm): This bit has a tip diameter of 50.1mm and maximum diameter of 75.0mm, made from solid carbide with a TiAlN coating for drilling thick steel (up to 25mm thick) and reinforced concrete. The taper angle is 50°, and the bit length is 300mm. It features a 8-flute spiral design for efficient chip removal and is compatible with 3” drill chucks. It is recommended for use with hydraulic drills (RPM: 5–80) and is commonly used in bridge construction to drill holes for structural steel beams.

5.2 Brand: Caterpillar (USA) – CAT Ultra-Large Cone Drill Bits

• Model CD-100 (70.0mm – 100.0mm): This bit has a tip diameter of 70.0mm and maximum diameter of 100.0mm, made from high-strength carbide (tungsten carbide with 15% cobalt) for drilling in hard rock (e.g., granite, basalt) and thick steel (up to 30mm thick). The taper angle is 55°, and the bit length is 400mm. It features a proprietary flute design that reduces dust buildup and is compatible with 4” drill chucks. It is used with Caterpillar hydraulic boring machines (RPM: 2–50) and is commonly used in offshore drilling to drill holes for oil rig components.

5.3 Brand: Sandvik (Sweden) – Custom Ultra-Large Cone Drill Bits

• Custom Model S-120 (90.0mm – 120.0mm): This custom bit has a tip diameter of 90.0mm and maximum diameter of 120.0mm, made from solid carbide with a diamond-like carbon (DLC) coating for drilling in radioactive materials (e.g., uranium alloy) and thick stainless steel. The taper angle is 60°, and the bit length is 500mm. It is designed for use with specialized nuclear-grade drill presses (RPM: 1–30) and is used in nuclear power plants to drill holes for maintenance and repair.
• Custom Model S-150 (120.0mm – 150.0mm): This ultra-large custom bit has a tip diameter of 120.0mm and maximum diameter of 150.0mm, made from tungsten carbide with a ceramic coating for drilling in extremely hard materials (e.g., diamond-reinforced concrete). The taper angle is 65°, and the bit length is 600mm. It is compatible with 5” drill chucks and used with hydraulic boring machines (RPM: 0.5–20) in large-scale construction projects, such as dam building.

Conclusion