Dormer A777 HSCo Heavy-Duty Jobber Drill Bit, Cobalt Steel, 7mm

The Dormer A777 Metric Cobalt Jobber Drill Bits are engineered for heavy-duty applications where high heat generation is expected during drilling. These premium drill bits feature a robust 135° split point design, making them particularly effective when working with high-tensile, tough materials such as those commonly found in the aerospace industry.

Constructed from HSCo Cobalt steel with a bronze surface treatment, these drill bits offer exceptional durability and heat resistance. The standard helix flute geometry and thick web ensure optimal chip evacuation and structural integrity during demanding operations.

Specification Breakdown

• Flute Geometry: Standard helix, right-hand spiral, thick web
• Point Angles:
  • 0.30mm–0.95mm: 118° conical point
  • 1.00mm–1.40mm: 135° 4-facet point
  • 1.50mm+: 135° split point (NAS 907 Aerospace Spec P3 Point)
• Material: HSCo Cobalt steel with bronze surface treatment
• Tip Diameter: 7.0mm
• Working Length: 69mm
• Overall Length: 109mm

Compliant with DIN 338 RN, BS328, and ISO 235 standards, the Dormer A777 drill bit delivers reliable performance in the most challenging drilling scenarios.