Dormer A777 HSS-E Cobalt Jobber Drill Bit DOR500COB Pack of 10

A777 Metric Cobalt Jobber Drill Bits are designed for heavy-duty drilling, featuring a 135° split point that is ideal for tougher materials and applications often encountered in aerospace-grade work. Constructed from HSCo cobalt steel with a bronze surface treatment to help reduce cutting edge sticking and improve tool life, these bits are specified for standard aerospace and engineering materials. The flute geometry is standard with a right-hand spiral and thick web, supporting stable guidance and resistance to chip welding. Tip and point geometry variants accommodate different diameters: a conical 118° point for smaller sizes, and 135° split point for larger sizes, aligned with NAS 907 aerospace specification type P3 when applicable. Overall, the bit is designed to deliver accurate holes and reliable performance for demanding drilling tasks.

Features

• 5.0 mm tip diameter
• 52 mm working length
• 86 mm overall length
• 135° split point (NAS 907 type P3)
• HSCo cobalt steel with bronze surface
• Standard flute: right-hand spiral, thick web