TopThread™ Catalogue Numbering System TopThread Holder Identification System NSR2525M4 N S R 2525 M 4 Insert Insert Hand Drop Shank Tool Insert Qualified Holding Mounting of Tool Head Size Length Size Holder Method Location N— Shank height and L1 ISO Q — Qualified TopThread™ End mount width in mm and W1 holder holder 32 A 40 B E 50 C 60 D 70 E 80 F 90 G Side mount, offset 100 H 110 J S 125 K insert size W1 140 L 2 3,81 150 M 160 N 3 4,95 Side mount, 4 6,98 no offset 170 P 5 9,65 180 Q AS 200 R 6 9,73811,13 250 S 300 T 350 U 400 V 450 W DH 500 Y special x length End mount R L Side mount R L widia.com F23