Tooling News No.046

Small Diameter Boring Bars

BSME series/SEXC series

Rev. 2

Clamp mechanism achieves
high-precision cutting edge position

BSME Type (Brazed)

SEXC Type (Indexable Insert)

Min. Bore Dia ø2.5mm

Min. Bore Dia ø4.0mm

BN2000AC1030U
T1500A
BN2000BN7000SinteredAlloy

Inserts for SEXC Type

Coated Carbide andCermet grades lineup

Small Diameter Boring Bars

BSME series/SEXC series¢ Features

Basic Configuration

D For internal boring of hardened steel with min. bore
diameters from ø2.5mm
D Achieves high-precision cutting edge positioning
thanks to the newly developed clamp mechanism
D Realises high-efficiency machining by switching fromgrinding to cutting in the small diameter range
D Brazed Type BSME TypeSet Screw
Adapter Sleeve
InsertCan be used with bore diameters from ø2.5 to 5.0mm

D Indexable Insert Type SEXC Type

Holder (Internal Coolant Supply)

Positioning Pin	Can be used with bore diameters from ø4.0 to 6.0mm.
Expansion of Coated Carbide and Cermet grades

D Economical 2-cornered insert
Brazed CBN Type BSME TypeIndexable Insert Type SEXC Type

Min. Bore Dia.: ø2.5 to 5.0mm

Min. Bore Dia.: ø4.0 to 6.0mm
2-corneredinsert used

High-quality,uniquecutting edge
shapeInternal
Coolant Supply(Standard)Internal
Coolant Supply(Standard)

Clamp Mechanism

Set Screw

Achieves high-precision cutting edge
positioning by combining a holder witha tapered rear end and a sleeve with aninternal positioning pin.
(common to BSME and SEXC types)

HolderTapered Rear End
Positioning Pin

Adapter Sleeve

Excellent chip evacuation
with FYF Type chipbreaker

Excellentmachinedsurface quality
with cermetgrade(SEXC Type)(SEXC Type)
10mm

Work Material: SUS304 Internal Boring, Insert: ECEM 03X102L-FYF (AC1030U)
Cutting Conditions: vc=100m/min f=0.05mm/rev ap=0.03mm Work Dia.: ø4Work Material: SCM415 Internal Boring, Insert: ECEM 03X102L-FYF (T1500A)
Cutting Conditions: vc=100m/min f=0.03mm/rev ap=0.03mm

Machining Precision¢ Application RangeHigh

Indexable Type

SEXC

Brazed Type

BSME

2.0

3.0

4.0

Work Diameter (mm)5.0

Ra:0.29μm
Rz:2.06μm

6.02

Small Diameter Boring Bars

BSME series

Hardened SteelSUMIBORON
BrazedCDX

DCON

DNWFRE¢ Holder (DMIN Min. Bore Dia.
10°

DCON

Internal Turning and Facing

Fig 2

DMIN Min. Bore Dia.
10°
DN

Fig 1WF

BSMERELFCDXLFSUMIBORON) 

Cat. No.

BSME R/L25020D2S6
BSME R/L25020D3S6
BSME R/L25020D4S6
BSME R/L30020D2S6
BSME R/L30020D3S6
BSME R/L30020D4S6
BSME R/L35020D2S6
BSME R/L35020D3S6
BSME R/L35020D4S6
BSME R/L40020D2S6
BSME R/L40020D3S6
BSME R/L40020D4S6
BSME R/L45020D2S6
BSME R/L45020D3S6
BSME R/L45020D4S6
BSME R/L50020D2S6
BSME R/L50020D3S6
BSME R/L50020D4S6Dimensions (mm)BN2000Min. Bore Dia.

Shank Diameter

Neck Diameter

D D
D D

DMIN

DCON

DN

LF

WF

CDXRE

2.5
2.5
2.5
3.0
3.0
3.0
3.5
3.5
3.5
4.0
4.0
4.0
4.5
4.5
4.5
5.0
5.0
5.0

6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0

2.0
2.0
2.0
2.5
2.5
2.5
3.0
3.0
3.0
3.5
3.5
3.5
4.0
4.0
4.0
4.5
4.5
4.5

32.0
34.5
37.0
32.8
35.8
38.8
33.5
37.0
40.5
33.9
37.9
41.9
35.0
39.5
44.0
35.8
40.8
45.8

1.20
1.20
1.20
1.45
1.45
1.45
1.70
1.70
1.70
1.95
1.95
1.95
2.20
2.20
2.20
2.45
2.45
2.45

5.3
7.8
10.3
6.3
9.3
12.3
7.3
10.8
14.3
8.3
12.3
16.3
9.3
13.8
18.3
10.3
15.3
20.3

0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2

R L

D D
D D
D D
D D
D D
D D
D D
D D
D D
D D

Overall Length

Cutting Edge Distance Min. Depth of Cut

Corner Radius

Applicable
FigSleeve
111222222
HBSM6020
HBSM6020A 222222222The BSME Type requires HBSM6020(A) adapter sleeve (sold separately).

¢ Identification Table

BSM E R 350 20 D2 S6Series

Carbide Feed Min. Bore Dia. Cutting
Shank Direction
Edgewith Oil
CornerHoleRadiusFig 1Fig 2

ø20 DCB

ø20 DCB

M8

L/D

Rc1/819
LF

LF

HBSM6020
HBSM6020A

Stock¢ Sleeve (Sold Separately) Cat. No.

ShankDia.

DDDimensions (mm)Bore Dia.

Overall Length

DCB

LF6.06.08080Set
Screw Wrench

FigCat. No.

AFBSM60

1BT0506 TH025
2Mounting Method¢ Alignment Jig (Sold Separately) For HBSM6020 Sleeve
StockD

This jig is used for centring sleeves when setting them into sleeve holders.

P5¢ Recommended Cutting Conditions
Work Material
Spindle Speed n (min-1)
Depth of Cut ap (mm)Feed Rate f (mm/rev)

H Hardened Steel
Above 2,000
Above 2,000
0.01-0.15
0.01-0.15
0.01-0.10
0.01-0.10

May cause chattering or chipping at the cutting edge in low-speedmachining.
Excessive depth of cut causes deformation of the tool, whichconsequently leads to deterioration of dimensional tolerance.

D mark: Standard stocked item Blank: Made-to-order item3

Small Diameter Boring Bars

SEXC series
CarbideSteelCast Iron

Non-Ferrous Metal

Exotic Alloy

Hardened Steel

Carbide / Cermet / SUMIBORON
Screw-on

SEXC

Fig 1
DMIN Min. Bore Dia.
10°
DNInternal Turning and Facing

WF

DCON

Coolant Hole

Stainless Steel

CDX

LF

GAMF

¢ HolderParts 
Stock Min. Bore Dia.

Cat. No.

ShankDiameter

NeckDiameter

R L DMIN DCON DN

E06D2-SEXC R/L03-04P D DE06D3-SEXC R/L03-04P D D
E06D2-SEXC R/L03-05P D D
E06D3-SEXC R/L03-05P D D
E06D2-SEXC R/L03-06P D D
E06D3-SEXC R/L03-06P D D

4.0
4.0
5.0
5.0
6.0
6.0

6.0
6.0
6.0
6.0
6.0
6.0

3.75
3.75
4.75
4.75
5.75
5.75

Dimensions (mm)BoltOverall Cutting Edge Depth ofLength
Distance
Cut

Applicable
SleeveRake Angle

LF

WF

CDX GAMF

33.75
37.75
35.25
40.25
36.75
42.75

1.95
1.95
2.45
2.45
2.95
2.95

81210151218

-13°
-13°
-12°-12°-11°-11°

WrenchFig

HBSM6020
HBSM6020A

1
MIB1.6-2
11
MIB1.6-2.5
11
MIB1.6-3
10.2
0.2

SDBSM

0.2

The SEXC Type requires HBSM6020(A) adapter sleeve (sold separately).

¢ Identification Table

E 06 D2 - S E X C R 03 - 04 P
Carbide Shank
Shank
Dia.
with OilHole

L/DInsert
Screw- Insert Cutting Insert Feedon
Shape Edge Relief Direction Inscribed
CircleShape Angle

Fig 1Fig 2

ø20 DCB

ø20 DCB

M8Rc1/819
LF

LFStock¢ Sleeve (Sold Separately) Cat. No.

HBSM6020
HBSM6020A

DDDimensions (mm)Bore Dia.

Overall Length

DCB

LF

6.06.08080Fig

AFBSM60

R L R LECEM 03X1005 R/L-FYF D D D D Q Q 0.05 1
ECEM 03X101 R/L-FYF D D D D Q Q 0.1 1
ECEM 03X1015 R/L-FYF D D D D Q Q 0.15 1
ECEM 03X102 R/ L-FYF D D D D Q Q 0.2 1
0.2 22NU-ECXA 030X02 LE Q Q Q Q D2NU-ECXA 030X02 LF Q Q Q Q D D 0.2 2P5ø3.31

RE7°

ø1.8REDDimensions (mm)Fig 1FigStockThis jig is used for centring sleeves when setting them into sleeve holders.

1BT0506 TH025
2SUMIBORON) CornerRadius

Cat. No.

1.1575°

Fig 2
ø3.31

RE7°

ø1.8

BN2000BN7000

T1500A

AC1030U

Cat. No.

Coated Carbide /¢ Alignment Jig (Sold Separately) For HBSM6020 Sleeve

Set
Screw Wrench

Mounting Method¢ Insert (Min. Accessories
BoreDia.

1.1575°

Part Number Suffix: LE: Honed Edge, LF: Sharp Edged, FYF: Sharp Edged (with Chipbreaker)¢ Recommended Cutting Conditions
Work Material
P General SteelK Cast Iron
H Hardened Steel
M Stainless SteelN Non-Ferrous Metal S Exotic Alloy
Insert Grades
AC1030U
T1500A
AC1030U
T1500A
AC1030U
T1500A
AC1030U
T1500A
AC1030U
BN2000BN7000Spindle Speed n (min-1) 2,000-10,000 2,000-10,000 2,000-8,000 2,000-8,000 2,000-10,000 2,000-10,000 5,000-15,000 5,000-15,000 2,000-6,000 Above 2,000 Above 2,000
Depth of Cut ap (mm) up to 0.2
up to 0.2
up to 0.2
up to 0.2
up to 0.2
up to 0.2
up to 0.2
up to 0.2
up to 0.2
0.01-0.15
0.01-0.15
Feed Rate f (mm/rev) up to 0.05 up to 0.05 up to 0.05 up to 0.05 up to 0.05 up to 0.05 up to 0.05 up to 0.05 up to 0.05 0.01-0.10
0.01-0.10
May cause chattering or chipping at the cutting edge in low-speed machining. Excessive depth of cut causes deformation of the tool, which consequently leads todeterioration of dimensional tolerance.
Recommended Tightening Torque (N·m) D mark: Standard stocked item D mark: Standard stocked item (new product/expanded item) Blank: Made-to-order item Q mark: Not available

4Small Diameter Boring Bars

BSME series/SEXC series¢ Dedicated Adapter Sleeve / Alignment Jig

Adapter Sleeve
HBSM6020
Alignment Jig
AFBSM60¢ Mounting Method (HBSM6020A has a side lock flat, so centring with an alignment jig is not required).
1 Insert the alignment jig until it hits the positioning pin
set in the adapter sleeve, and tighten the two set
screws.

(2) Tighten the two set screws(1) Insert until it hits
the positioningpin

2 Mount the sleeve into the sleeve holder andtemporarily tighten the fastening screws.
Temporaryscrew
fastening
Holder for Sleeve

3 Rotate the sleeve gradually to adjust until the flat stripof the alignment jig is horizontal.

When a boring bar is mounted into the sleeveadjusted by the alignment tool, its cutting edge
position will automatically be set at the centre.

Holder Front View

4 Using a tool presetter, measure the diameter of thetool.
*Steps 1 and 3 above are not required when using HBSM6020A.

5Alignment Jig

Small Diameter Boring Bars

BSME series/SEXC series¢ Application Examples

BSME

Machine Components

SEXC

Small Automotive Components

BSME Type provides stable machining and a tool life that isover 2 times longer than our competitors’ CBN tools.

SEXC Type provides stable machining and a tool life that isover 4 times longer than competitors’ products.

Machining Application: Conical Surface Machining

Machining Application: ø7.1 Internal Boring

BSME

SEXC

3,600 (pcs.)

Competitor's
CBN ToolCompetitor'sBrazed CBN Tool

400 to 1,500 (pcs.)
0

1,000

2,000

2,700 (pcs.)

3,000

600 (pcs.)
0No. of Workpieces (pcs.)
Tool: BSME R30020D3S6 Grade: BN2000
Cutting Conditions: vc=28 to 48m/min f=0.02mm/rev ap=0.02-0.05mm Wet (Oil-based)

Hardened Alloy Steel Valve Components

BSME

Small Bearing Steel Automotive Components

1,700 (pcs.)

SEXC

Competitor's
CBN Tool

600 (pcs.)

Competitor'sBrazed CBN Tool

500

1,000

1,500

2,000

SEXC

1,500 (pcs.)
1,000 (pcs.)
0No. of Workpieces (pcs.)
Tool: BSME R50020D2S6 Grade: BN2000
Cutting Conditions: vc=135m/min (7,500min-1) f=0.02mm/rev ap=0.10mm Dry

3,000

SEXC Type provides drastically reduced tool costs and a tool lifethat is 1.5 times longer than our competitors’ brazed CBN tools.

BSME

02,000Holder: E06D3-SEXC R03-06P Insert: 2NU-ECXA 030X02LF (BN2000)
Cutting Conditions: vc=156m/min (7,000min-1) f=0.03mm/rev ap=0.10mm Wet (Emulsion)

ø4.0

ø5.0

BSME Type provides stable machining and a tool life that is over
2 times longer than our competitors’ CBN tools.

1,000

No. of Workpieces (pcs.)

500

1,000

1,500

No. of Workpieces (pcs.)
Holder: E06D2-SEXC R/L03-04P Insert: 2NU-ECXA 030X02LF (BN2000)
Cutting Conditions: vc=50m/min (4,000min-1) f=0.02mm/rev ap=0.02mm Wet

6MEMO7Sumitomo Electric Cutting Tools Official Apps for iOS/AndroidCutting calculation App

Grade & chipbreaker comparison App

Very hot or lengthy chips may be discharged while themachine is in operation. Therefore, machine guards, safety
goggles or other protective covers must be used. Fire safety
precautions must also be considered.

< SAFETY NOTES >Please handle with care as this product has sharp edges.
Improper cutting conditions or mis-handling of the tool may resultin breakages or projectiles. Therefore, please use the tool within its
recommended conditions.

When using non-water soluble cutting oil, precautions
against fire must be taken and please ensure that a fire
extinguisher is placed near the machine.

Hardmetal Division
Global Marketing Department : 1-1-1, Koyakita, Itami, Hyogo 664-0016, Japan
https://www.sumitool.com/global

R(2022.9)II 1510 TP/AK