Dormer A777 HSCo Heavy-Duty Jobber Drill Bit, 3.5mm, Cobalt Steel
Professional 3.5mm cobalt steel drill bit with 135° split point, ideal for aerospace and tough materials. 70mm length.
The Dormer A777 HSCo Heavy-Duty Jobber Drill Bit is designed for professional use in demanding applications where high temperatures are generated during drilling. Constructed from HSCo Cobalt steel, this drill bit excels when working with tougher, higher tensile materials, making it particularly suitable for the aerospace industry.
Key Features:
- Heavy-duty construction: Built to withstand extreme conditions
- 135° split point geometry: Reduces walking and improves centering
- Special flute design: Standard helix, right-hand spiral with thick web for strength
- Bronze surface treatment: Enhances durability and heat resistance
Precision Engineering:
The drill bit features different point angles depending on size:
- 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 type P3 Point)
Compliant with DIN 338 RN / BS328 / ISO 235 standards, this drill bit offers exceptional performance in industrial applications where precision and durability are paramount.
- Aerospace industry applications
- Drilling high-tensile materials
- Industrial metalworking
- Precision engineering
- Material: HSCo Cobalt steel
- Surface Treatment: Bronze
- Flute Geometry: Standard Helix, Right hand spiral, Thick Web
- Point Geometry: 135° split point (for sizes 1.50mm+)
- Tip Diameter: 3.50mm
- Working Length: 39mm
- Overall Length: 70mm
- Weight: 75g
- 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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