Cobalt M42 vs Carbide Hole Saw: Which Cuts Better?
By Drill Hog® | Published: 2026-10-28
Category: Comparisons
Compare cobalt M42 drill bits and carbide-tipped hole saws for metal cutting. Learn which tool suits your project based on hole size, material, and precision needs.
Quick answer
For large-diameter holes in thick metal, a cobalt M42 drill bit set offers superior durability and reusability. For clean, burr-free holes in sheet metal or thin stock, a carbide-tipped hole saw is faster and more precise.
Key differences in design and application
Cobalt M42 drill bits are solid, high-speed steel tools with added cobalt for heat resistance. They excel in drilling through tough materials like stainless steel and hard alloys, especially when you need a precise hole diameter from 9/16" up to 1". Their 135-degree split point prevents walking, and the tri-flat shank keeps the bit from slipping in the chuck.
Carbide-tipped hole saws use a tungsten carbide cutting edge brazed onto a steel body. They are designed to cut a circular plug, leaving a clean edge with minimal burrs. The built-in pilot bit centers the cut, and the spring ejects the plug automatically. These saws work best on sheet metal, thin plate, and softer materials where a smooth finish matters more than extreme durability.
Trade-offs at a glance
- Material thickness: Cobalt M42 bits handle thick metal (over 1/8") without overheating. Carbide hole saws are best for thin sheet metal (under 1/8") to avoid tooth damage.
- Hole finish: Carbide hole saws produce nearly burr-free holes. Cobalt M42 bits may leave a slight burr that needs deburring.
- Long-term value: A cobalt M42 set like the BIG 8 can be resharpened and reused many times. Carbide-tipped hole saws wear faster and are typically replaced once dull.
- Setup and speed: Carbide hole saws cut faster per hole because they remove a ring of material rather than the entire circle. Cobalt M42 bits require a slower feed rate and more pressure.
Product facts
- BIG 8 Super Premium Cobalt M42 Silver & Deming Drill Bit Set: Includes 8 fractional sizes from 9/16" to 1" in super premium cobalt M42 steel with a 135-degree split point. You get a complete set for drilling larger holes in hard metals without needing to sharpen or replace bits frequently.
BIG 8 Super Premium Cobalt M42 Silver & Deming Drill Bit Set - 1" Carbide Tipped Hole Cutter Tct HoleSaw Drill Hog®: 1" diameter tungsten carbide tipped hole cutter with a pilot bit and spring-eject plug system. It cuts clean, accurate holes with no burrs in sheet metal, and the auto-eject speeds up repetitive work.
1" Carbide Tipped Hole Cutter Tct HoleSaw Drill Hog®
Which one should you choose?
Best for
- Drilling multiple large holes in thick steel or stainless steel
- Users who want a durable, long-lasting tool set for repeated use
Not for
- Cutting clean holes in thin sheet metal or soft materials
- Jobs where speed and minimal cleanup are the top priority
