Dorian Tool CAT40 Shank Alloy Steel 8620 End Mill Holder, 2.5" Projection, 0.88" Nose Diameter, 1/4" Hole Diameter

Dorian Tool CAT end mill holders. CAT 40 style. Holder comes with a Certificate of Inspection. Precision Balanced to 12,000 rpm. 0.0001-inches taper-bore runout tolerance for more cutting tool life and better surface finish. Made of 8620 alloy steel with case hardness of 56-60 HRC and core hardness of 36-40 HRC for durability and rigidity. Tapers ground to AT-3 specifications or better, ensures precise fit with max contact surface area with machine spindle. H5 bore tolerance for air-tight fit provides maximum contact surface area. Provides a very close tolerance fit with minimum runout between the tool holder's bore and the cutting tool. Thru Hole of the tool holder allows the use of Thru Coolant Tools when used with a Thru Coolant retention knob. Made in Italy. Hole diameter: 1/4-inches. Gage length: 2.50-inches. Body diameter: 0.88-inches. Set screw: M6X8