SUMIBORON Small Hole Boring Tools For Hardened Steel BNBB Type BNBB type small hole boring tools for hardened work pieces up to diameter 3,5 mm „Sumiboron“ Brazed Boring Tools for Small Hole Boring Cat. No. Dimensions (mm)StockDmindl1hrApplicableholderGrade ofbrazed cuttingedge BNBB (Carbide shank) BNBB 03 R l 3,5 3 60 2,4 0,2 HBB 316 BNBB 04 R l 4,5 4 60 3,4 0,2 HBB 416 SUMIBORON BNBB 05 R l 5,5 5 80 4,4 0,2 HBB 516 (CBN) BNBB 06 R l 6,5 6 80 5,4 0,2 HBB 616 BN250 BNBB 08 R l 8,5 8 100 7,4 0,2 HBB 816 Holder Spare Parts Dimensions (mm) Cat. No. Stock Screw Wrench d1 L d2 H HBB 316 l 3 HBB 416 l 4 HBB 516 l 16 100 5 15 HBB 616 l 6 HBB 816 l 8 BT 0404 TH 020 Recommended Cutting Conditions Precaution On Use WorkMaterial SUMIBORON BN250 Notes Cutting 30 ~ 150 m/ Low speed may cause chatteringin cutting process and chipping speed (v c) min occurence on the cutting edge. Hardened steels Feed rate ( f ) 0,03 ~ 0,1mm/rev - (HRC45~68) l Adjust overhang to achieve absolute minimum. Excessive depth of cut mayDepth of cut0,03 ~ 0,2cause larger deformation of(doc)mmtool,resulting in deteriorationl For use of a small diameter brazed boring tool, selecthigh speed and small feed rate, as much as possible. of bore accuracy. M40 l = Euro stock Sumiboron / SumiDia Tools