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Cobalt M42 drill bit – provides upgraded M42 Cobalt jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
Enhanced M42 alloy material – contains 8% Cobalt alloy that delivers 10x life vs. Standard bits
High-heat resistant bits – withstand high-temperature applications for extended periods of time
Thick web-helix design – provides additional stability in tough applications
Surface-hardened tip – penetrates tough abrasive materials
【M35 Cobalt High Speed Steel】Industry grade M35 high speed steel drill bit set, much harder than HSS used in other similar drill bits set. These drill bits contain 5% Cobalt, which increases wear-resistance and durability.
【Most Commonly-Used 13 Sizes】A complete combo set of 13 jobber length industrial drill bits for metal drilling (1/16",5/64",3/32",7/64",1/8",9/64",5/32",11/64",3/16",13/64",7/32",15/64",1/4") . They fit the majority of power drill currently on the market and comes with a portable plastic case for easy storage and organization.
【Precise & Efficient Drilling Performance】✔ Fully Ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance. ✔ 135° Split Point with round straight shank prevents walking and makes drilling precise and faster. No center punch is needed.
【Multiple Application】Perfectly suitable for cutting through Hard Metal such as Stainless Steel, Steel, Sheet Metal and Cast Iron as well as Plastic, Aluminum Alloy, Wood and Other Softer Metals. ✔ Pay attention to speed, pressure and heat control during drilling.
【90 Days Warranty】At Amoolo, we center on customer satisfaction. Get your drill bits today along with our 90-day Hassle-Free Warranty Policy, exchange or refund guaranteed for any product defect!
HIGH QUALITY MATERIAL: 5% Cobalt High Speed Steel M35 provide extended tool life compared to ordinary drill bits. Durable and strong
TWIST DESIGN & PERFORMANCE: PRECISE 135°SPLIT POINT, gold oxide finish and round straight shanks. Prevent walking, clear chips and particles faster.Produced by precision fully ground which ensures chips move smoothly.
PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials.
SIZE INCLUDED: 15pcs jobber length drill bit set with plastic storage case including sizes:1/16" 2pc,5/64" 1pc ,3/32" 2pc,7/64" 1pc,1/8" 2pc ,9/64" 1pc, 5/32" 1pc, 3/16" 1pc, 7/32" 1pc, 1/4" 1pc, 5/16" 1pc, 3/8" 1pc.
100% SATISFACTION GUARANTEE: If you are not 100% satisfied with your purchase for any reason whatsoever simply please feel free to contact us.
Premium 5% Cobalt Steel ,68 HRC (Rockwell Hardness Scale) ,the Cobalt Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.
The Cutting Edge has been Ground Three Times and is made of Cobalt Steel, which has High Hardness and Heat Resistance. It is Designed for Drilling through Stainless Steel, Hardened Steel, Iron, Aluminum, Pipes, Wood, PVC, and Plastics.
This Heavy Duty Work Cobalt Drill Bit is Typically Capable of Running Two to Three Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Through the Material with a Blunt Drill Bit.
High Quailty Material: Manufactured from Industry grade M35 High Speed Steel with 5% Cobalt added, usually giving better Heat, Wear and Chip Resistance and Long Tool Life.
135° Split Point: The 135° fast cutting point is automatically centered and prevents walking, clears chips and particles faster. Making drilling precise, reducing friction and heat for a smooth chip movement.
Professional Drill Bits: gold oxide finish and round straight shanks， fully ground spiral groove design with high grinding accuracy, for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals.
Set includes: 15pcs jobber length drill bit set with plastic storage case, includes 1/16" 2pc, 5/64" 1pc, 3/32" 2pc, 7/64" 1pc, 1/8" 2pc, 9/64" 1pc, 5/32" 1pc, 3/16" 1pc, 7/32" 1pc, 1/4" 1pc, 5/16" 1pc, 3/8" 1pc.
QUALITY COMMITMENT: If for any reason you are not satisfied with your purchase, please contact us. We provide 30-day money back. 100% Satisfaction Guarantee for risk-free shopping!
【Premium True 5% Cobalt Steel with 68 HRC】- The Marked Cobalt Content of Ordinary Drill Bits May be False, but This Drill Bits Set is Made of Cobalt Ore from Our Own Mine, Which Indeed Contains 5% Cobalt. Although the Cost and Price are Slightly Higher, It Usually is able to Provide 3X Heat,Wear and Chip Resistance and 3X Tool Life.
【Split Point Design and Fully Ground Process】- Compared with Other Ordinary Drill Bits, This Drill Bits Set is Particularly Suitable for Heavy Duty Work, Such as Cutting through Stainless Steel,Steel Plate,Iron Sheet, Cast Iron and Hardwood, and Drilling Out Bolts Studs and Screws.
【3X Efficiency + 3X Tool Life】- This Cobalt High Speed Steel Drill Bits Set is Typically Capable of Running 3 Times Faster. Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
【Sharp Drill Bit Edge】- This Kind of Drill Bits Beast Can Even Cut Hardened Metal into Long Iron Bars, While a Dull Drill Bit Can Just Slowly Wear Through Metal.
【High Quality Material】：Manufactured from high-speed steel and coated in gold oxide, Yougfin jobber drill bits are able to withstand friction and heat so you can drill continuously without the bits heating up
【135-Degree Split Point & Twist Design】：The split point design increases the cutting edge on the tip, and the blunter 135° angle means more of the cutting edge touches the surface sooner. The grooves on the sides of the bits’ twisted shanks will bring metal shavings up and out of the hole as you drill
【Product Feature】: Twist drills are indicated in sizes. Assortment comes with a combined 29 sizes added：1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8"，25/64"，13/32"，27/64"，7/16"，29/64"，15/32"，31/64"，1/2"
【Multiple Application】：Perfectly suitable for drilling wood, plastic, and some lightweight metal materials. Drill bit holder with size index for easy induction and arrangement, and a portable metal case are both included
【Application & Tip】：Please keep the bit perpendicular to the material during operation to prevent it from breakage. ***Tip***：If you have any questions about Yougfin products, please feel free to contact us
DIMENSIONS - Include 10 pcs 1/2" Cobalt Drill Bits, packed in a plastic box for easy storage
APPLICATION - Ideal for precision drilling on stainless steel and other hard materials for longer service life, such as drilling stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
MATERIAL - Our drill bits for metal is made of Industry grade M35 High Speed Steel, containing 5% cobalt, All grinding drill bit, smooth surface, high grinding precision, sharp edge, durable
FEATURES - 135° standard industrial double rear edge Angle, self-centering to prevent walk-off and faster chip .Double spiral cutting slot design, large capacity cutting space, good cutting performance, improve drilling efficiency
SHANK DESIGN - The more than 1/2 Inch reduced shank is compatible with all drill presses and most power tools in the market, and the unique Tri-flatted shank end locks onto a 3-jaw chuck more tightly and securely to eliminate slippage during operation
[M35 Cobalt High Speed Steel] Industry grade M35 drill bit with 5% cobalt, and complete grinding to achieve precise drilling diameter can improve wear resistance and durability, which is much harder than high speed steel used in other similar drill bit groups.
[135° Split Point] The 135° quick cut split point with straight shank is self centering to penetrate metal quickly with less pressure and prevents bit "walking." Easily cuts without the need for a center punch, thus in faster drilling performance.
[Multiple Applications] Ideal for cutting hard metals such as stainless steel, steel, sheet metal and cast iron as well as plastics, aluminum alloys, wood and other softer metals. Pay attention to speed, pressure and heat control when drilling.
[90 Day Warranty] Comes in a metal storage case for easy storage. If you are not completely satisfied for any reason, please feel free to contact us and we will give you our most sincere response.
Great product and very good quality. Made from M35 Hight-speed Steel and 5% Cobalt.Size:9/32inch,Total lengh:4.33inch,Work lengh:2.75inch
The blades are very sharp and they drill into metal fast.Including Steels,Cast Iron ,Copper,Galvanized Pipe,Aluminum Alloy,Wood, Plastic and Other Hard Metals.If drilling hard metal, Highly recommended use drilling press and control RPM.Not for Glass or Ceramic Materials.
Full-grinding Nitriding,Good Wear resistance,Durable,Spiral groove design, well chip removal performance.135 Tip & Twist Design,Increases cutting speed with self-centering and prevents walking.
For Professional and DIY Use, household maintenance and repair.These are so good to save times
Works great and good price, Will be a good assistant in your work
Drilling into cast iron requires precision and durability, given the material’s hardness and brittleness. Cast iron, widely used in manufacturing, construction, and even cookware, demands drill bits that can withstand its abrasive nature without dulling quickly or causing damage to the workpiece. The right drill bits not only make the job easier but also ensure clean, accurate holes. With various types and materials of drill bits available, selecting the best ones for drilling into cast iron requires understanding your specific needs and the features that will best suit your tasks. This guide will provide you with essential considerations to help you select the best drill bits for cast iron.
Key Features to Consider
Material
High-Speed Steel (HSS): Offers good durability and is suitable for drilling into softer cast iron. Can be used for general-purpose drilling.
Cobalt (Co): Provides superior heat resistance and longevity, ideal for drilling into harder grades of cast iron and for prolonged use.
Carbide-Tipped: Offers the highest hardness and heat resistance, best for professional use in industrial applications involving cast iron.
Bit Type
Twist Drill Bits: The most common type, suitable for a wide range of drilling tasks, including into cast iron.
Cobalt Drill Bits: Specifically designed for drilling into harder metals, including stainless steel and cast iron, due to their high heat resistance.
Coating
Black Oxide: Increases wear resistance and reduces friction, suitable for drilling into softer cast iron.
Titanium Nitride (TiN): Extends the life of the drill bit and increases drilling speed, though may not be as effective on harder cast iron as cobalt or carbide bits.
Point Angle
135-degree Split Point: Reduces “walking” or slipping at the start of drilling, ideal for precise drilling on hard surfaces like cast iron.
118-degree Point: Standard angle suitable for softer materials but may still be used on cast iron with careful operation.
Flute Design
Parabolic Flute Design: Offers better chip removal, reducing the risk of clogging and overheating when drilling into cast iron.
Shank Type
Round Shank: Fits most standard drills but may slip under high torque.
Hex Shank: Provides a better grip, reducing the chance of slipping, especially in high-torque applications.
Pros and Cons
Pros of Cast Iron Drill Bits
Cons of Cast Iron Drill Bits
✔️ Designed to withstand the hardness and abrasiveness of cast iron
❌ High-quality materials like cobalt and carbide can be expensive
✔️ Specialized coatings and flute designs improve efficiency and lifespan
❌ Requires careful handling and proper cooling to prevent bit damage
✔️ Various types and materials available for different cast iron drilling needs
❌ Not all drill bits are suitable for all types of cast iron or thicknesses
✔️ Split point angles reduce slipping and improve accuracy
❌ Drilling into cast iron can be time-consuming and requires patience
Quick Tips
Assess the Hardness of the Cast Iron: Choose a drill bit material that matches the hardness of the cast iron you’re working with.
Opt for Quality: Investing in higher-quality cobalt or carbide-tipped drill bits can enhance durability and performance, especially for frequent use.
Use Proper Technique: Ensure adequate lubrication and use a slow, steady speed to prevent overheating and maintain bit sharpness.
Selecting the best drill bits for cast iron involves considering the material, bit type, coating, point angle, flute design, and shank type. The ideal drill bits for your projects will offer the durability, heat resistance, and precision needed to tackle the challenges of drilling into cast iron effectively. Whether you’re working on automotive parts, construction materials, or cast iron cookware, investing in the right drill bits can greatly enhance your drilling capabilities, leading to cleaner, more accurate holes and more efficient project completion.
