Grooving and Cut-Off TopGroove™ Boring Bars Necked steel shank with through coolant. Right-hand toolholder shown. A-NNT-1 hex/ gage clamp Torx order number catalogue number D D min D2 L1 L2 F A CS insert clamp screw Plus right hand 3641648 A10KNNTOR1 10 11,5 10,0 125 — 7 3,2 — NG1L CM109 MS1034 1.5 mm 3641647 A12MNNTOR1 12 11,5 8,7 150 31,30 7 4,0 1/16-27 NPT N.1L CM109 MS1034 1.5 mm NOTE: Minimum bore capability varies with depth of groove. See pages E86–E87 for details. F dimension measured over sharp point of insert. widia.com E79