
SUMIBORON Small Diameter Boring Bars BSME Type ■ Characteristics ● Achieves minimum machineable diameter of ø2.5 mm for hardened steel internal machining ● Achieves high precision cutting edge positioning through newly developed clamp mechanism ● Achieves high performance machining comparable to grinding machining with further cutting in the small hole region ● Brazed type BSME type handles machining diameters from ø2.5 mm up to ø5.0 mm ● Indexable insert type SEXC type handles machining diameters from ø4.0 mm up to ø6.0 mm SUMIBORON BSME E Internal Fig 1 DMIN Min. machinable diameter Fig 2 DMIN Min. machinable diameter / Facing 10° DN 10° DN Boring DCON DCON Bars WF WF RE RE CDX CDX LF LF ■ Tools Dimensions (mm) Min. machining Cutting edge Grades diameter Diameter Neck diameter Length distance Depth of cut Nose radius Applicable Cat. No. BN2000 Fig DMIN DCON DN LF WF CDX RE sleeves R L BSME R/L25020D2S6 D D 2.5 6.0 2.0 32.0 1.20 5.3 0.2 BSME R/L25020D3S6 D D 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 BSME R/L30020D2S6 D D 3.0 6.0 2.5 32.8 1.45 6.3 0.2 BSME R/L30020D3S6 D D 3.0 6.0 2.5 35.8 1.45 9.3 0.2 BSME R/L30020D4S6 3.0 6.0 2.5 38.8 1.45 12.3 0.2 BSME R/L35020D2S6 D D 3.5 6.0 3.0 33.5 1.70 7.3 0.2 BSME R/L35020D3S6 D D 3.5 6.0 3.0 37.0 1.70 10.8 0.2 BSME R/L35020D4S6 3.5 6.0 3.0 40.5 1.70 14.3 0.2 HBSM6020 BSME R/L40020D2S6 D D 4.0 6.0 3.5 33.9 1.95 8.3 0.2 BSME R/L40020D3S6 D D 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 BSME R/L45020D2S6 D D 4.5 6.0 4.0 35.0 2.20 9.3 0.2 BSME R/L45020D3S6 D D 4.5 6.0 4.0 39.5 2.20 13.8 0.2 BSME R/L45020D4S6 4.5 6.0 4.0 44.0 2.20 18.3 0.2 BSME R/L50020D2S6 D D 5.0 6.0 4.5 35.8 2.45 10.3 0.2 BSME R/L50020D3S6 D D 5.0 6.0 4.5 40.8 2.45 15.3 0.2 BSME R/L50020D4S6 5.0 6.0 4.5 45.8 2.45 20.3 0.2 BSME type requires separately sold sleeve HBSM6020. ■ Sleeves ■ Alignment Jig* ■ Newly Developed Clamp Mechanism High precision cutting edge positioning is achieved ø20 DCB through a combination of tool/holder with taper on the rear end, and a sleeve with an internal positioning pin. (Common to BSME Type / SEXC Type) Set screw LF Dimensions (mm) Tool / Holder Dia. Length Back end taper face Cat. No. Stock Set screw Wrench Cat. No. Stock DCB LF Positioning pin HBSM6020 D 6.0 80 BT0506 TH025 AFBSM60 D Sleeve Sleeve is sold separately. * This is a jig for centering the sleeve when installing the sleeve into the sleeve holder. E76