Balanced to G6.3 15,000 RPM to save spindle bearing life FEATURES Taper-to-bore runout <0.0002". Bore tolerance: H6AD coolant thru the spindle. Taper shank ground to AT3 accuracy (or better). Taper manufactured in accordance with ANSI B5.50 / ISO 7388 specifications. CAT 40 Draw bar threads: 5/8"-11 Includes Balancing certificate. PRODUCT SPECIFICATIONS Brand SHARK TOOLS Size 1" Taper CAT 40 Projection 4.00" Head Diameter 2.25" Model # ST40EM100400B Arbor Hole Diameter 1" Capacity 1" Depth of End Mill Insertion 2.64" Drawbar Thread 5/8"-11 Hole Diameter 1" Key Size 3/8" Length From Projection Face To Center of First Set Screw 1.12" Length From Projection Face To Center of Second Set Screw 1" Nose Diameter 2.25" Set Screw Size 3/4"-16 Style End Mill Holder Type CAT End Mill Holder Weight 3.52 lbs. Country of Origin Import