TopGroove™ Catalogue Numbering System TopGroove™ Holder Identification System NSR2525M4 N S R 2525 M 4 Insert Insert Hand Drop Shank Tool Length Insert Qualified Holding Mounting of Tool Head Size Size Surface and Method Location Length N— End mount Shank height W1 TopGroove* and width in mm L1 ISO and holder length according to ISO 32 A EE standard. 40 B 50 C 60 D 70 E 80 F 90 G Side mount 100 H Offset 110 I insert *Proprietarystandard only. SS 125 J size W1140K23,81mm150L34,95mm 160 M 4 6,98mm 170 N 5 9,65mm 180 P 6 9,73mm Side mountNo offset DH 200 Q250R 8 11,13mm for swiss 300 S machining 350 T 400 U 450 V AASS 500 WSpecialY DH = Drop Head Length X NRR undercut End mount Q—qualified metric holder R LL Side mount back clearance R L NOTE: Holders are designed to locate insert inclined to 3° to provide back clearance down open side. widia.com E73