M4 Counterbore Drill Ø8.0mm, pilot Ø4.3mm DIN 373 Fine (0214000800100)

Special drills used to make counterbores that are often required when using bolts that have a hex drive. Common in DIN912 bolts, but also DIN6912, and DIN794, and DIN 84. Before using this special drill, it's  required to drill a pilot hole that matches the size of the guidance pin, on the drill. In the 2D dimensional drawing, it's  the d1 dimension. In the compatible products tab, we also have a link to the correct drill, we advise for drilling the pilot hole.

Component features:

• Pilothole diameter        d1:  4.30mm
• Counterbore diameter  d2:  8.00mm
• Shaft/collet size            d3: 5.00mm 
• Total Length                 L1:71.00mm
• Cutting edge length      L2: 14.00mm
• Number of teeth            Z: 3
• Maykestag part number  : 2140008001