Dormer A777 HSCo Heavy-Duty Jobber Drill Bit, 5.50mm
Dormer A777 HSCo cobalt drill bit (5.5mm) for aerospace & tough materials. 135° split point, bronze-treated.
The Dormer A777 Metric Cobalt Jobber Drill Bit is engineered for heavy-duty applications, featuring a robust 135° split point design that excels in high-heat drilling scenarios. This makes it particularly effective for tougher, higher tensile materials, with notable suitability for the Aerospace Industry.
Key Features
- Material: Premium HSCo Cobalt steel ensures exceptional durability and heat resistance.
- Point Geometry: Varies by size – 118° conical point (0.30–0.95mm), 135° 4-facet point (1.00–1.40mm), or 135° split point (1.50mm+), adhering to NAS 907 Aerospace Specification (Type P3 Point).
- Flute Design: Standard helix, right-hand spiral with a thick web for optimal chip evacuation and strength.
- Surface Treatment: Bronze finish enhances wear resistance and performance longevity.
Specifications
- Tip Diameter: 5.50 mm
- Working Length: 57 mm
- Overall Length: 93 mm
- Standards Compliant: DIN 338 RN / BS328 / ISO 235
Ideal for professionals requiring precision and resilience, the A777 delivers reliable performance in demanding environments.
- Drilling high-tensile materials
- Aerospace industry applications
- Heavy-duty metalworking
- Material: HSCo Cobalt steel
- Flute Geometry: Standard helix, right-hand spiral, thick web
- Point Angle: 135° split point (size-dependent)
- Surface Treatment: Bronze
- Tip Diameter: 5.50 mm
- Working Length: 57 mm
- Overall Length: 93 mm
- Standards: DIN 338 RN / BS328 / ISO 235
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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