The tension and compression in the SM units is increased to accommodate excessive synchronization inaccuracies. The chucks are non-reversing, change of tapping direction is done by machine spindle (G84 tapping cycle). Features Self-feed (tension/compression) Adjustable hard start Multi-range RF collets Adjustable back jaws to drive the tap Interchangeable tool holders Application For CNC machining centres and all machines with spindle reversal. Accessories Each chuck includes wrenches, all necessary hex keys and one stop arm. Please order the necessary 2 multi-range collets and arbor separately. SM Tapping Chucks With Straight Shank Manufactured to DIN 1835B+E