A Brand® ADO (6550)

High Performance Coolant-Fed Carbide Drills for Ferrous and Non-Ferrous Materials


The A Brand® ADO drill series is OSG's premium line of carbide coolant-fed high performance drills, designed to drill in a variety of steels up to 30X diameter without pecking. New point geometry creates sharp cutting action for reduced thrust forces, while our proprietary EgiAs coating provides drastically higher hardness and heat resistance, enabling higher drilling speeds and incredible tool life.


OSG's EgiAs Nano Coating Technology

Higher coating oxidation temp & hardness dramatically improve wear resistance

Wavy form cutting edge design

Sharper cutting action reduces thrust forces and produces smaller chips for easy hole processing

Internal coolant holes

Coolant delivery at the cutting edge reduces heat and improves chip evacuation, thereby increasing tool life and enabling faster drilling speeds.

Application Guide

ISO Work Material Recommended
P Low Carbon Steel : 1010, 1018
P Medium Carbon Steel : 1035, 1045
P High Carbon Steel : 1065
P Alloy Steels : 4140, 4340
P Die Steels
M Stainless Steels : 300
M Stainless Steels : 400
M Stainless Steels : 17-4PH
K Cast Iron
N Aluminum : 6061, 7075
N Aluminum : Casting
S Nickel Alloy : Inconel
S Titanium : 6AL4V (30HRC)
H Hardened Steels : ~35 HRC
H Hardened Steels : 35-45 HRC
H Hardened Steels : 45-50 HRC
H Hardened Steels : 50-70 HRC

good best



List 6500 - A Brand® ADO - 3xD, Coolant Through View Offering >   View Overview >

List 6510 - A Brand® ADO - 5xD, Coolant Through View Offering >   View Overview >

List 6520 - A Brand® ADO - 8xD, Coolant Through View Offering >   View Overview >

List 6530 - A Brand® ADO - 10xD, Coolant Through View Offering >   View Overview >

List 6535 - A Brand® ADO - 15xD, Coolant Through View Offering >   View Overview >

List 6540 - A Brand® ADO - 20xD, Coolant Through View Offering >   View Overview >

List 6550 - A Brand® ADO - 30xD, Coolant Through View Offering >   View Overview >

Alternate Products

List 6300 - A Brand® AD - 2xD View Offering >   View Overview >

List 6310 - A Brand® AD - 4xD View Offering >   View Overview >



Aluminum Alloy, Cast Aluminum, Cast iron, Carbon Steels, Alloy Steel, Die Steel, Stainless Steel, Hardened Steel <50HRC


Holes up to 30X diameter in depth, where coolant-through is an option.


Any application where productivity and the lowest cost-per-hole is the goal.



Additional Information

When grinding or regrinding industrial cutting tools, residual grinding dust may occur. This dust may contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm.
For more information go to www.P65Warnings.ca.gov