Product Description Pro-Series 1" X CAT 40 V-Flange Shell End Mill Arbor ~ for CNC machines with CAT 40 taper spindles. ~ Made of 20CrMnTi alloy steel. ~ Electrolysis nickel coating. ~ Balanced to 8,000 RPM. ~ Tolerance is .0002" maximum. ~ Material is 42 CrMo. ~ Hardness is HRC 50~52. ~ Thread tolerance class is 4H. ~ Retention knob thread is 5/8-11.
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