ER Collet Chuck, Form AD, BT 30 Short, for ER Collet: 20

Taper ground internally and externally. All shanks hard turned for smooth running!. With RFID/Balluffchip bore. High-quality precision clamping nut. Clamping nut balanced for HSM G2.5/25-000 rpm. Optimum wear characteristics and torque transmission due to the coated precision clamping nut. Advantage: The double contact between the taper and the flat flange creates a more stable and precise clamping situation: Better surface quality Longer tool life times Consistent seating in the headstock even at high speeds Smaller radial run-outA BT double contact arbor can also be used in a standard BT machine spindle - and vice versa. The advantages of the double contact are however achieved only when a double contact arbor and double contact spindle are used together. Application: For clamping tools with parallel shank in collets to DIN 6499 Form A and B. Supplied with: ER clamping nut. Optional extras: ER collets No. 308881 309434, ER chuck keys No. 309680 - 309720 or 613300, ER clamping nut 309610. Pull studs PS No. 308760 308806. Pull stud wrenches No. 308820, 308835. Note: Matching clamping nut No. 309580 or 309610. Clamping range: 1 13 mm Overhang dimension A: 60 mm a: 1 mm External Dia D: 34 mm Spare ER clamping nut No. 309580: 20 ER chuck key No. 309680: 20