Dormer A777 HSCo Heavy-Duty Cobalt Drill Bit, 4.2mm, 75mm
Dormer's precision A777 HSCo cobalt drill bit (4.2mm) features 135° split point for aerospace & tough materials.
The Dormer A777 HSCo Heavy-Duty Cobalt Drill Bit is engineered for precision and durability in demanding drilling applications. Its robust design features a heavy-duty 135° split point, making it ideal for high-tensile materials where significant heat generation occurs – particularly suited for aerospace industry applications.
Key Features
- Made from HSCo Cobalt steel for enhanced heat resistance and durability
- 135° split point geometry (to NAS 907 Aerospace Specification type P3 Point) for improved centering and reduced walking
- Standard helix flute geometry with right-hand spiral and thick web for sturdy performance
- Bronze surface treatment for reduced friction and extended tool life
- Complies with DIN 338 RN / BS328 / ISO 235 standards
Applications
- Aerospace industry applications
- Drilling high-tensile or difficult-to-machine materials
- Heavy-duty industrial drilling where heat resistance is crucial
This drill bit combines exceptional performance with the trusted quality of Dormer’s precision engineering.
Need larger quantities? Need additional quantities? Get in touch and we'll arrange it for you.
- Dispatched within 0-2 business days
- Delivery to Worldwide: 6-7 business days*
- Free Shipping Included
- Aerospace industry applications
- High-tensile material drilling
- Industrial heavy-duty drilling
- Precision metalworking
- Material: HSCo Cobalt steel
- Flute Geometry: Standard helix, right-hand spiral, thick web
- Point Angle: Varies by size (see details in description)
- Surface Treatment: Bronze
- Tip Diameter: 4.20mm
- Working Length: 43mm
- Overall Length: 75mm
Always follow local regulations and product guidance.
Free standard delivery on Canadian mainland orders. Express delivery options and international shipping available at checkout.
We offer a 30-day money-back guarantee on most products. For faulty items, contact us within 14 days for a replacement or refund.
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