A Brand® AT-2 (16645)

Advanced Performance End-Cutting Thread Mill for High-Hardness Steels


The OSG A Brand AT-2 Thread mills with end-cutting edge for high hardness steels is ideal for highly difficult high hardness steel applications. The risk of sudden tool breakage can be minimized by breaking chips into small and manageable pieces and evacuating them smoothly. Since no pilot hole is required, process integration and the risk of breakage can be avoided.


Newly developed DUROREY coating

enables superior heat resistance and high toughness optimized for high-hardness steel milling!

Special cutting edge shape

controls tool deflection

Left-hand cut configuration

enables climb milling to prolong tool life

Added roughing teeth

to distribute the load

No pilot hole is required

Helical drilling + threading can be done simultaneously

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 16645 - A Brand AT-2 - Inch View Offering >   View Overview >

Alternate Products

List 16645 - A Brand AT-2 - Inch View Offering >   View Overview >

List 16640 - A Brand AT-2 - Metric View Offering >   View Overview >



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