Dormer A777 HSCo Heavy-Duty Jobber Drill Bit, 3.80mm
Heavy-duty Dormer A777 cobalt jobber bit (3.80mm) for tough materials. 135° split point, aerospace-grade.
The Dormer A777 Metric Cobalt Jobber Drill Bit is engineered for heavy-duty applications where high heat is generated during drilling operations. Featuring a robust 135° split point, this bit is specifically designed for drilling tough, high-tensile materials, making it particularly suited for aerospace industry applications.
Constructed from HSCo Cobalt steel, this drill bit offers exceptional durability and heat resistance. The standard helix, right-hand spiral, and thick web flute geometry ensure efficient chip removal and reduced friction. The bronze surface treatment enhances corrosion resistance, prolonging the tool's lifespan.
Point Angle Specifications
- 0.30 mm - 0.95 mm: 118° conical point
- 1.00 mm - 1.40 mm: 135° 4-facet point
- 1.50 mm and above: 135° split point (NAS 907 Aerospace Specification P3 Point)
Compliant with DIN 338 RN / BS328 / ISO 235 standards, this drill bit guarantees precision and reliability. Its compact dimensions and optimised geometry make it ideal for professional workshops and industrial applications alike.
- Drilling high-tensile materials
- Aerospace industry applications
- Industrial metalwork
- Precision engineering
- Material: HSCo Cobalt steel
- Flute Geometry: Standard Helix, Right-hand Spiral, Thick Web
- Point Angle: 135° Split Point (1.50mm and above)
- Surface Treatment: Bronze
- Tip Diameter: 3.80 mm
- Working Length: 43 mm
- Overall Length: 75 mm
- Weight: 6 g
- Standards: DIN 338 RN / BS328 / ISO 235
Always follow local regulations and product guidance.
Free standard delivery on UK 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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