BoringSmal Diameter Turning BarsVery Smal Diameter Turning Stock WF DN DCON WF DN DCON SUMIBORON Small Hole Boring Bars BSME Type ■ Features ● Achieves the minimum bore diameter of ø2.5mm in boring of hardened steel ● Achieves high-precision cutting edge positioning thanks to the newly developed clamp mechanism ● Expands the range of small hole boring to achieve more high-efficiency machining requiring no grinding ● BSME Type (Brazed Type) E Can be used with work diameters from ø2.5 to 5.0mm● SEXC Type (Indexable Insert Type) Can be used with work diameters from ø4.0 to 6.0mm C Carbide SUMIBORON Coolant Hole Brazed BSME Fig 1 DMIN Min. Bore Dia. Fig 2 DMIN Min. Bore Dia. D Internal Turning and Facing 10° 10° RE CDX RE CDX LF LF R Holder ( SUMIBORON)S Dimensions (mm) Cat. No. BN2000 Min.RLBore Dia.DMINDiameterDCONNeckDiameterDNOverall Cutting Edge Max. Boring CornerLengthDistanceDepthRadiusLFWFCDXREApplicableSleeveFig BSME R/L25020D2S6 ●● 2.5 6.0 2.0 32.0 1.20 5.3 0.2 1 T BSME R/L25020D3S6 ●● 2.5 6.0 2.0 34.5 1.20 7.8 0.2 1 BSME R/L25020D4S6 2.5 6.0 2.0 37.0 1.20 10.3 0.2 1 BSME R/L30020D2S6 ●● 3.0 6.0 2.5 32.8 1.45 6.3 0.2 2 BSME R/L30020D3S6 ●● 3.0 6.0 2.5 35.8 1.45 9.3 0.2 2 BSME R/L30020D4S6 3.0 6.0 2.5 38.8 1.45 12.3 0.2 2 V BSME R/L35020D2S6 ●● 3.5 6.0 3.0 33.5 1.70 7.3 0.2 2 BSME R/L35020D3S6 ●● 3.5 6.0 3.0 37.0 1.70 10.8 0.2 2 BSME R/L35020D4S6 3.5 6.0 3.0 40.5 1.70 14.3 0.2 HBSM6020 2 BSME R/L40020D2S6 ●● 4.0 6.0 3.5 33.9 1.95 8.3 0.2 HBSM6020A 2 W BSME R/L40020D3S6 ●● 4.0 6.0 3.5 37.9 1.95 12.3 0.2 2 BSME R/L40020D4S6 4.0 6.0 3.5 41.9 1.95 16.3 0.2 2 BSME R/L45020D2S6 ●● 4.5 6.0 4.0 35.0 2.20 9.3 0.2 2 BSME R/L45020D3S6 ●● 4.5 6.0 4.0 39.5 2.20 13.8 0.2 2 BSME R/L45020D4S6 4.5 6.0 4.0 44.0 2.20 18.3 0.2 2 BSME R/L50020D2S6 ●● 5.0 6.0 4.5 35.8 2.45 10.3 0.2 2 BSME R/L50020D3S6 ●● 5.0 6.0 4.5 40.8 2.45 15.3 0.2 2 BSME R/L50020D4S6 5.0 6.0 4.5 45.8 2.45 20.3 0.2 2 The BSME Type requires HBSM6020 (A) adapter sleeve (sold separately). Alignment Jig Fig 1 Fig 2 ø20 DCB ø20 DCB Cat. No. Stock M8 Rc1/8 AFBSM60 ● 19 LF LF This jig is used for centring sleeves when setting them into holders. Sleeve Dimensions (mm) Newly Developed Clamp Mechanism Bore OverallDia.LengthSetScrewWrench Achieves high-precision cutting edgepositioning by combining a tool/holder that Cat. No. Fig has a tapered rear end with a sleeve having an internal positioning pin. DCB LF (common to BSME and SEXC types) Set Screw HBSM6020HBSM6020A ● 6.0●6.0 8080 12 BT0506 TH025 Tool/Holder Adapter sleeve is optional. Tapered Rear End Adapter Sleeve Positioning Pin E64 ● mark: Standard stocked item (new product/expanded item)