bi-metal hole saw1

8 month ago

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10 month

Product details

This tool employs a premium bi-metal construction where a high-hardness cutting edge (HSS M35/M42, HRC 62-64) is integrally bonded to a durable carbon steel support through high-temperature vacuum welding. The design merges the abrasion resistance and keenness of high-speed steel with the fracture-resistant durability of carbon steel, ensuring robust performance without compromising cutting integrity. Teeth are precision-finished with a 14° positive rake angle and 4° relief angle to minimize effort during drilling and yield smooth, precise holes free of burrs. An engineered tooth configuration (2–5 TPI, scaled to hole size) enables effective debris removal and avoids tooth blockage in prolonged applications. It maintains sharpness for over 90 hours of non-stop use on common substrates such as mild steel, stainless steel (≤3mm), aluminum alloys, copper, plastic, and wood. Compared to conventional carbon steel versions, it exhibits significantly enhanced wear resilience, lasting 2 to 3 times longer in service.

This tool is built to deliver exacting results, maintaining tight tolerances critical for professional work. Its controlled runout (≤0.05mm) and strict hole diameter accuracy (≤±0.1mm) ensure clean, round holes with superior edge quality and high axial alignment (perpendicularity ≤0.03mm/m). The precision-cut finish typically requires no further rework, suiting it for standard precision applications in electrical, piping, and metal fixture installations.

Designed for multi-material use, it comes in various diameters spanning 12mm to 250mm. It performs reliably on an array of substances such as low-carbon steel, thin-gauge stainless steel (≤3mm), non-ferrous metals (aluminum, copper, brass), and common synthetics or wood composites (plastic, plywood, MDF). This versatility makes it a preferred choice for tasks ranging from home improvement and electrical fittings to vehicle upkeep, industrial machining, and everyday DIY needs.

M42 Cobalt Bi-Metal Construction – Features high-speed steel with 8% cobalt for superior hardness, heat resistance, and long life
when cutting stainless steel, hard metal, and abrasive materials.

Versatile Cutting Range: 14 to 210mm – Covers most hole sizes
needed for industrial, electrical, plumbing, and general construction tasks. Ideal for stainless steel, metal sheet, wood, and
plastic panels.

4/6 TPI Variable Teeth Design – Alternating teeth per inch (TPI) ensure smoother cuts, reduced vibration, and

faster chip removal across a wide range of materials, improving performance and tool longevity.

Dual Thread Sizes for Arbor Compatibility –

• Dia. 14–30mm: 1/2"-20 UNF rear thread (fits small arbors)

• Dia. 32–210mm: 5/8"-18 UNF rear thread (fits heavy-duty big arbors)

Fully compatible with standard arbors and pilot drill systems for both DIY and industrial users.

Ready for Power Tools – Designed for electric drills, cordless drills, and drill presses. Ideal for professionals needing high-performance hole cutting tools for demanding metalworking applications.

M3 vs M42 Bi-Metal Hole Saw Cutter – 5 Key Differences

Material & Composition

M3 Version: Made from M3 high-speed steel, ideal for general-purpose cutting with good wear resistance and toughness.

M42 Version: Made with HSS containing 8% cobalt, offering superior hardness and heat resistance for cutting stainless steel and hard metals.

Cutting Performance

M3: Suitable for wood, plastic, aluminum, and low-to-medium hardness steel.

M42: Optimized for high-efficiency cutting in stainless steel, alloy steel, and abrasive materials.

Durability & Heat Resistance

M3: Durable for light to moderate-duty tasks; performs well at standard drilling speeds.

M42: Excellent durability and maintains hardness under high temperatures — ideal for extended and intensive drilling.

Thread & Arbor Compatibility

Both:

14–30mm: 1/2"-20 UNF thread (small arbors)

32–210mm: 5/8"-18 UNF thread (large arbors) Fully compatible with standard pilot drill and arbor systems.

Best For

M3: DIYers, light industrial use, electricians, and general contractors.

M42: Metal fabricators, HVAC pros, stainless steel installers, and heavy-duty industrial users

Technical Specifications

Product Images

Product Features & Advantages

Engineered for Peak Performance

Exceptional Heat & Wear Resistance: Performs reliably in continuous high-temperature drilling scenarios, outlasting ordinary HSS drills by 2-5 times.
Superior Edge Strength: The cobalt-enhanced matrix provides high resistance to chipping and deformation, even under heavy feed pressure.
Reduced Material Adhesion: The material's property minimizes "built-up edge" (BUE) when machining gummy materials like stainless steel or certain alloys, ensuring cleaner holes and smoother operation.
Precision Ground Flutes & Point: Each bit undergoes full (full grinding process) for optimal dimensional accuracy (h8/h9), superior surface finish on the hole, and consistent point geometry for immediate penetration.

Application Scenarios

Insoul Cobalt Drill Bits are the go-to choice for professionals working with demanding materials across various industries.

Primary Material Applications:

Stainless Steel: Ideal for grades 304, 316, 410, etc. Commonly used in food processing equipment, architectural fabrication, and marine applications.
High-Temperature Alloys & Titanium: Essential in aerospace, automotive (turbo components), and energy sectors.
High-Strength/Alloy Steel: Perfect for machining hardened steel, forgings, and high-tensile structural components.
Cast Iron & Non-Ferrous Metals: Provides excellent life and finish in cast iron, bronze, and brass.

Industry-Specific Use Cases:

Metal Fabrication Shops: For drilling clean, precise holes in stainless steel sheets and frames.

Machine Shops & Toolrooms: For maintenance, repair, and prototyping on a wide range of hard metals.

Automotive & Motorsport: Drilling into suspension components, engine parts, or exhaust fittings.

HVAC & Plumbing: Installing systems that require drilling into various metal ducts and pipes.

Frequently Asked Questions (FAQ)

Q1: Are you a factory or trading company?
A: We are 22 years+ professional manufacturer in drill bit tools industry.Welcome to visit our company.We guarantee our products are factory price, very cheap and competitive.
Q2: Do you provides sample?ls it free or extra?
A: Yes.We could offer the samples for free charge but do not pay the cost of freight.
Q3: why your price is higher than other company?
A: Because we are doing our own brand:the quality of the products is absolutely guaranteed.
Q4: What is the MOQ?
A: We have fixed MOQ for each of our products. But if you need less,it's ok,as we will change the price according to your quantity.
Q5: What is your term of payment?
A: 30% by TT in advance,and balance before delivery.
Q6: How long is your delivery time?
A: Generally it is 7-10 days，If the goods are in stock.Or it is 20-30 days. If the goods are not in stock,it is according to quantity.

Why Choose Insoul Tools?

Built on 22 years of focused expertise in drill manufacturing, Insoul is recognized as a dependable source for industrial-grade cutting tools. Our production infrastructure includes a 5,000 sqm facility equipped with more than 100 precision CNC machines, all integrated within a stringent quality management framework. This allows us to maintain uniform excellence across our entire line, from high-performance cobalt drill bits to dedicated hole saws. For us, technological advancement and consistent quality are not just principles but essential commitments; every detail in the manufacturing chain is carefully managed to ensure end-users receive tools they can trust.

We understand that suitable packaging is a crucial part of logistics and storage. Therefore, we have prepared multiple professional packaging solutions. Standard shipping uses a combination of a "white inner box and a kraft paper outer carton," ensuring solid protection while emphasizing environmental friendliness and ease of unpacking. For bulk orders, we offer standardized palletized packaging services, significantly enhancing shipment security and logistics efficiency to help you optimize supply chain processes. We always focus on details and are committed to supporting the smooth operation of your business through reliable packaging.