HiRunER Precision ER Collet Chuck, BT 40, Projection: 70, for ER Collet: 20

External and internal tapers are ground. All shanks are hard turned for smooth running. Including RFID / Balluffchip bore, high-performance clamping nut up to 25000 rpm. Advantage: Excellent concentricity in the system chuck + collet + clamping nut, 3um radial run-out with a 2um collet, 6um radial run-out with a 5um collet. Extremely strong holding force up to factor 2 better than the standard ER chuck. Vibration reduction effect due to 2-part clamping nut. Application: For clamping tools with plain shank in collets to DIN 6499 Form A and B. Supplied with: Precision clamping nut. Optional extras: Pull studs PS No. 308760 - 308802, PS wrenches No. 308820 - 308835, ER chuck keys No. 309757, 309758 for 11M and 16M, ER collets Fahrion No. 308901 - 309434. ER collets No. 308901 309432, hook wrench 628400 or torque wrench 309749 or 628520. Note: Clamps only nominal Dia up to shank Dia tolerance h 10. Do not use the clamping nut in combination with a sealing washer. Use it in only combination with Fahrion collets. The blue design ring must be removed for Fahrion HP 2um ER collets. ER chuck key No. 309748, No. 309749: 20 Clamping range: 1 13 mm Overhang dimension A: 70 mm External Dia D: 38 mm Spare ER clamping nut No. 309617: 20