Dorian Tool CAT40 Shank Alloy Steel 8620 Shell Mill Holder, 1.75'' Projection, 1'' Arbor Diameter by Dorian Tool at Elite Apprenticeships. MPN: CAT40 SMH-1000-1750. Hurry! Limited time offer. Offer valid only while supplies last. Dorian Tool CAT taper shell mill holders. CAT 40 style. Holder comes with a Certificate of Inspection. Precision Balanced to 12,000 rpm. 0.0002-inches taper-arbor 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. Provides a very close
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