TERMS
Drill Dimensions
d 1 = Drill Diameter d 2 = Shank Diameter l 1 = Overall Length l 2 = Drill Depth l 3 = Body Length
l 2
l 3
l 1
Drill Material
Carbide
HSS
High Speed Steel w/ 8% Cobalt
Solid Carbide
Drill Geometry
Margin
Main Clearance Surface
Secondary Clearance Surface
Drill Back
Chisel Edge
Drill Back Edge
Point
Drill Depth
Main Cutting Edge
Flute Length
Cutting Corner
Web Thickness
Shank Length
Body Length
Cutting Face
Overall Length
20º
2xd
H7-H9
130º
Length-to-Dia. Ratio
Achievable Hole Tolerance
Drill Point Angle
Helix Angle
5
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