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Made of alloy forged steel, hardened to HRC 52-56.
Drawbar thread: 5/8"-13
Taper: CAT40, Collet Size: ER20
Projection Length: 2.76"
Range: 1/8"-1/2"
CAT40-ER20 V-Flange Collet Chucks, Projection Length 2.76'', 1/8'' - 1/2'', For ER20 Collet. Made of alloy forged steel, hardened to HRC 52-56 Draw Bar Thread 5/8-11 Taper: CAT40; Collet Series: ER20; Projection Length: 2.76''; Range: 1/8''-1/2'' All critical surface are precision ground Concentricity is less than 0.0001'' from taper to end mill pocket. Comes packed in fitted box.