Dormer A777 HSS-E Cobalt Jobber Drill Bit 6.80mm

This heavy-duty A777 Jobber Drill is designed for demanding drilling in tough materials, with particular relevance to aerospace applications where higher heat can be generated. It uses HSCo cobalt steel and a bronze surface treatment for durability, and features a 135° split point for larger sizes to enhance self-centering and hole quality. The drill has a standard flute geometry with a thick web and right-hand spiral, providing reliable performance across a range of tough materials. Tip diameter is 6.80 mm, with a working length of 69 mm and an overall length of 109 mm, suitable for drilling tougher materials and high-temperature environments.

Features

• 135° split point enhances self-centering
• HSCo cobalt steel with bronze oxide finish
• Standard helix, right-hand spiral, thick web
• Tip angles vary by size: 0.30–0.95 mm at 118°; 1.00–1.40 mm at 135°; 1.50 mm and above at 135° split point
• Tip diameter 6.80 mm; length: 69 mm working, 109 mm overall
• Suitable for harder materials and aerospace applications

Technical specifications

• Material: HSCo cobalt steel
• Surface treatment: Bronze oxide
• Flute geometry: Standard helix, right-hand spiral, thick web
• Point angles: 0.30–0.95 mm = 118°; 1.00–1.40 mm = 135°; 1.50+ mm = 135° split point (NAS 907 type P3)
• Tip diameter: 6.80 mm
• Working length: 69 mm; Overall length: 109 mm