Description
Overview:
The Irwin HSS Cobalt Drill Bit 3.3 mm (model 10502545) is a high-strength metal drilling bit designed for clean, accurate holes in tough materials. It is manufactured from high-speed steel with 5% cobalt (often referred to as M35), giving improved heat resistance and wear life when drilling stainless steel and other high-alloy steels. A 135° split-point tip helps the bit start precisely and reduces wandering, so less feed pressure is needed. The golden tempered surface supports durability under sustained use. With an overall length of 65 mm (2.56 in) and a working length of 36 mm (1.42 in), it suits compact work and pilot drilling. Use it in standard cordless or corded drills and drill presses fitted with a suitable chuck.
Key Features:
- 5% cobalt HSS (M35) for heat and wear resistance in stainless and high-alloy steels
- 135° split-point tip for fast starting, improved centring, and reduced walking
- Precision-ground flutes for efficient chip evacuation and smoother drilling
- Diameter: 3.3 mm for fine holes and pilot drilling (common for M4 tapping)
- Overall length: 65 mm (2.56 in); working length: 36 mm (1.42 in) for controlled access
- Golden tempered finish for added surface hardness and service life
- Suits standard drill chucks; round shank for secure, straightforward clamping
- Performs best at lower speeds with cutting fluid on stainless steel
- Resharpenable cutting edges to extend tool life when maintained correctly
- Reliable choice for site work, workshop use, and maintenance tasks
Typical Applications:
Drilling stainless steel sheet, box section, and plate; high-tensile and alloy steels; cast steel; and many non-ferrous metals such as brass and copper. Ideal for pilot holes, clearance holes, and prep for tapping (3.3 mm is the usual tapping size for M4 × 0.7). Common in fabrication, plant maintenance, automotive brackets, electrical trunking, HVAC ducting, and general workshop metalwork.
Also known as:
M35 cobalt twist drill, 3.3 mm metal drill, 135-degree split-point bit, jobber-length cobalt HSS drill, stainless steel drill bit 3.3 mm, tapping drill for M4, cobalt steel twist drill, metalworking drill bit 3.3 mm.
Product Specifications
| L&S Part No. | IRW10502545 |
|---|---|
| Manufacturer | Irwin |
| OEM No. | IRW10502545 |
| Unit of Sale | 1 |
| Size | 7mm x 105mm x 7mm |
| Machine Type | Drills |
| Key Features | - 5% cobalt HSS for heat and wear resistance - 135° split-point tip reduces wandering - 3.3 mm diameter for pilot drilling - Overall length: 65 mm; working length: 36 mm - Suits standard drill chucks with round shank |
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