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Product Description This Brand New Collet Chuck is for ER collet type. The flexibility of the ER holder can clamp drills, reamers, end mills, taps and much more. This holder use the standard ER 16 collets. It is possible to use different types of nuts while using the same holder and collets. Standard, M type and Bearing type, they offer stronger holding and reduce vibration of the tool. All chucks are passed hardness and anti crack test. Low strength steel could lead crack and rust very soon, especially by the inside pocket area, accuracy will drop too after a little while, so make sure avoid those bad steel and unbalanced chucks. Feature Produced according to AT3 specifications Collet Chuck accepts all ER16 collets; works on all BT40 machines Applied to CNC machining center Gage or projection length of ER16 is 4" Accuracy in Tenth, 0.0001" Fully ground flange and V-groove — easy on tool changers for less spindle and changer maintenance V-Flange BT40 is production balanced to high speed spindle turning and meet standard industrial needs High Speed True Balance in 15-20K RPM Hardened and ground to ensure maximum accuracy Through spindle coolant capability from pull stud to collets All our BT 40 end mill tool holders are production balanced to 12,000 RPM at G6.3 Specifications Total: 3 Chucks Taper: BT40 Collet Series:: ER16 Max Speed: 15000RPM Material: 20CrMnTi Gage Length: 4"(100mm) Draw Bar Threads: M16X2 Concentricity/runout: less than 0.0001" / 0.003mm