9Pcs M42 Bi-Metal Cobalt Hole Saw Set from China Suppliers - Durable Factory Direct Tooling for Precision Drilling
Product Overview
This M42 bimetal hole saw with white ground teeth is a professional cutting tool designed for high-precision and heavy-duty drilling tasks. It features a diameter range of 19mm to 51mm (3/4" to 2") and a maximum working depth of 48mm (1-7/8"), perfectly meeting diverse drilling needs in industrial and DIY scenarios.
Crafted from premium M42 high-speed steel with 8% cobalt content—superior to conventional M2 steel—the hole saw boasts exceptional heat resistance, wear resistance, and toughness. The white grinding tooth process enhances tooth sharpness and surface finish, ensuring smoother cutting, reduced friction, and minimized heat accumulation during operation.
Its bimetal structure combines the hardness of M42 steel teeth with the flexibility of a carbon steel body, effectively preventing tooth breakage and extending service life by over 50% compared to standard hole saws.
The progressive tooth design and 2X slanting slot structure optimize chip removal efficiency, avoiding chip clogging and improving cutting speed. Equipped with a high-precision M2 pilot drill bit and two hex shanks, the kit ensures accurate positioning, stable clamping, and compatibility with most drills. Each hole saw is clearly marked with both imperial and metric measurements for easy identification.
Product Features
Superior heat resistance and wear resistance compared to standard M2 steel.
M42 hardened teeth bonded to a flexible carbon steel body — prevents breakage.
Enhanced sharpness and surface finish for smoother, lower-friction cutting.
Efficient plug removal and faster chip evacuation to prevent clogging.
Each saw is clearly marked in both imperial and metric units for easy ID.
Outlasts conventional hole saws significantly under heavy-duty conditions.
Size Specifications
| # | Imperial Size | Metric Size |
|---|---|---|
| 1 | 3/4" | 19 mm |
| 2 | 7/8" | 22 mm |
| 3 | 1" | 25 mm |
| 4 | 1-1/8" | 29 mm |
| 5 | 1-1/4" | 32 mm |
| 6 | 1-3/8" | 35 mm |
| 7 | 1-1/2" | 38 mm |
| 8 | 1-3/4" | 44 mm |
| 9 | 2" | 51 mm |
🔹 Maximum Cutting Depth: 1-7/8" (48 mm)
Package Includes
- 9× M42 Bimetal Hole Saws
- 2× Hex Shanks (Universal Size)
- 1× M2 Pilot Drill Bit
- 1× Durable Carrying Case
Applicable Materials
Ideal for carpenters, electricians, plumbers, and DIY enthusiasts who require reliable, high-performance hole cutting across a wide range of materials.
Frequently Asked Questions
What is the difference between M42 and M2 steel in hole saws?
M42 high-speed steel contains 8% cobalt, which significantly improves heat resistance and hardness compared to standard M2 steel. This means M42 hole saws can handle harder materials and last over 50% longer under heavy-duty use.
What is the maximum cutting depth of this hole saw set?
The maximum cutting depth is 1-7/8" (48 mm), making it suitable for drilling through standard wood panels, metal sheets, plasterboard, and more.
Are these hole saws compatible with my existing drill?
Yes. The kit includes two universal hex shanks that fit most standard drills and drill presses. The hex shank arbor is designed to accommodate all hole saw sizes included in this set.
What materials can this M42 bimetal hole saw cut through?
This hole saw set is engineered to cut through a wide variety of materials including metal, hard wood, plywood, plastic, plasterboard, and aluminum — making it versatile for both professional and DIY applications.
What does the 2X slanting slot design do?
The 2X slanting slot design facilitates efficient plug removal and chip evacuation during cutting, which helps maintain cutting speed, reduces heat build-up, and extends the life of the teeth.
What is included in the carrying case and is it durable for job site use?
The carrying case contains all 9 M42 bimetal hole saws, 2 hex shanks, and 1 M2 pilot drill bit. The case is designed for organized storage and is sturdy enough for regular transport to and from job sites.