A Brand® AT-1 (16625)

Advanced Performance One Pass Thread Mill


The A Brand® AT-1 threadmill is designed with a left-hand helix for a small pitch diameter difference between the hole entry and the bottom of the hole, allowing a delay in gauge-out failure. Longer tool life can be achieved with elimination of “zero cutting” for correcting bending.


Unequal Spacing / Variable Lead Flute

For reduced vibration

Right-Hand Cut & Left-Hand Helix Geometry

Increases tool stability

EgiAs Coating

For exceptional wear resistance

Ultra-Fine Grain Carbide

For high wear resistance and toughness

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 16620 - A Brand AT-1 - Metric View Offering >   View Overview >

List 16625 - A Brand AT-1 - Inch View Offering >   View Overview >

List 16630 - A Brand AT-1 - NPT View Offering >   View Overview >

List 16631 - A Brand AT-1 - NPTF 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