Dorian Tool CAT taper ER collet holders. CAT 40 style. The only Clamping System with the versatility to allow and combine drilling, reaming, milling, and tapping utilizing the same chuck, without sacrificing accuracy or rigidity. Scientifically balanced to save spindle life, tool life, and increased productivity. Threaded through holes for a tool stop or coolant through when removed. Thru Hole of the tool holder allows the use of Thru Coolant Tools when used with a Thru Coolant retention knob and sealed collet. 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. Made in Italy. Collet Series: ER40. Collet range: 0.118 - 1.023-inches. Body diameter: 2.48-inches. Gage length: 2.50-inches. Hole depth: 1.50-inches.
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