7 LEADERS Radius End Mills (Carbide)（work material：Graphite）

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Carbide 2-Flute Corner Radius Medium End Mill 30° B257X

7 LEADERS

[Features]
· Also use the 2-flute medium shank radius end mill to prevent tip chipping.
· Enables radius cutting deep into the work materials.
· Nanoparticle multilayer coating.
· Excellent lubricity and abrasion resistance.
· Exhibits its strength in general cutting processes.

Volume Discount

Starting from^∗ ：	37.07 €
Min. Shipping Days ：	8 Days

*Unit price with basic configuration

Carbide 4-Flute Variable Split Corner Radius Medium End Mill 30° B258X

7 LEADERS

[Features]
· Also use the 4-flute medium shank radius end mill to prevent tip chipping.
· Enables radius cutting deep into the work materials.
· Nanoparticle multilayer coating.
· Excellent lubricity and abrasion resistance.
· Exhibits its strength in general cutting processes.
· It supports high-speed side cutting.

Volume Discount

Starting from^∗ ：	37.07 €
Min. Shipping Days ：	8 Days

*Unit price with basic configuration


Brand
Product Series
Starting from^∗
Min. Shipping Days ：
Blade diameter (D)(φ)
R Size(mm)
work material
Blade length (ℓ)(mm)
Number of flutes(sheet)
Type
Overall Length (L)(mm)
Shank diameter (d)(mm)
Underneck length (ℓ1)(mm)
Machining Application
Coating
Torsion Angle (θ)
R Precision(μm)


Brand	7 LEADERS	7 LEADERS
Product Series	Carbide 2-Flute Corner Radius Medium End Mill 30° B257X	Carbide 4-Flute Variable Split Corner Radius Medium End Mill 30° B258X
Starting from^∗	37.07 € *Unit price with basic configuration Volume Discount	37.07 € *Unit price with basic configuration Volume Discount
Min. Shipping Days ：	8 Days	8 Days
Blade diameter (D)(φ)	3 ～ 20	3 ～ 20
R Size(mm)	0.1 ～ 4	0.1 ～ 4
work material	Graphite[○]	Graphite[○]
Blade length (ℓ)(mm)	10 ～ 55	10 ～ 55
Number of flutes(sheet)	2	4
Type	Radius	Radius
Overall Length (L)(mm)	50 ～ 160	50 ～ 160
Shank diameter (d)(mm)	3 ～ 20	3 ～ 20
Underneck length (ℓ1)(mm)	-	-
Machining Application	Plane / Side / Curved surface	Plane / Side / Curved surface
Coating	-	-
Torsion Angle (θ)	Standard Helix (30˚ to 40˚)	Standard Helix (30˚ to 40˚)
R Precision(μm)	0～-20	0～-20

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Blade diameter (D)(φ)
0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

1.2

1.4

1.5

1.6

1.8

2

2.5

2.8

3

3.5

4

4.5

5

5.5

6

7

8

9

10

11

12

13

14

16

17

18

20

22

25
Drawing

Clear

R Size(mm)
R0

0.05

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.75

0.76

0.8

0.813

0.9

1

R1

1.1

1.2

1.219

1.3

1.4

1.5

R1.5

1.6

1.625

1.7

1.8

1.9

2

R2

2.031

2.1

2.2

2.3

2.4

2.438

2.465

2.5

R2.5

2.6

2.607

2.7

2.8

2.9

3

R3

3.05

3.2

3.5

4

R4

5

R5

6

R6

6.35

6.5

8
Drawing

Clear

work material
- General Steel
- Quenched and tempered steel
- High Hardness Steel: to HRC55
- High Hardness Steel: to HRC60
- High Hardness Steel: to HRC65
- Stainless Steel
- Cast Iron
- Aluminum
- Titanium
- Copper
- Graphite
- Resin
Details

Clear

Blade length (ℓ)(mm)
0.16

0.24

0.25

0.28

0.3

0.32

0.4

0.5

0.6

0.64

0.7

0.75

0.8

0.9

1

1.2

1.5

1.6

1.8

2

2.1

2.25

2.3

2.4

2.5

2.7

3

3.2

3.5

3.7

4

4.5

5

5.25

5.5

5.6

6

6.75

7

7.5

8

8.25

8.4

9

10

10.5

11

12

12.5

13

13.5

14

15

16

16.5

17

17.5

18

19

19.5

20

21

22

24

25

25.5

26

27

28

30

32

33

34

35

36

37.5

38

40

42

45

48

50

55

56

60

75
Drawing

Clear

Number of flutes(sheet)
2

3

4

5

6

8
Drawing

Clear

Type
- Radius
- High-Feed Radius
- Long-Neck Radius
- Tapered neck radius
Clear

Overall Length (L)(mm)
32

34

35

39

40

45

49

50

51

52

55

57

58

60

62

63

65

68

70

72

74

75

80

83

85

86

88.90

90

92

95

100

104

105

110

115

120

121

125

130

135

140

150

160

170

180

185

200

220

230
Drawing

Clear

Shank diameter (d)(mm)
3

4

5

5.8

6

7.8

8

9.8

10

11

12

13

14

15

16

17

18

20

25
Drawing

Clear

Underneck length (ℓ1)(mm)
1

1.5

1.8

2

2.4

2.5

3

3.5

3.8

4

4.5

5

6

7

7.5

8

9

10

12

12.5

13

14

15

16

18

19

20

21

22

24

25

27

28

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48

50

54

55

56

60

65

66

70

75

80

82

85

95

100

105

108

-
Drawing

Clear

Machining Application
- Plane
- Side
- Curved surface
- Groove
- Plunging (Z feed)
- Inclined Cuts
Images

Clear

Coating
- For High Hardness (Silicon Group)
- TiAlN
- For General Steels (AlCrN, etc.)
- TiCN
- DLC
- Dia Coat
- Non-Coated
- AlTiN
- Other
Details

Clear

Torsion Angle (θ)
- No torsion
- Weak torsion (15˚ to 25˚)
- Standard Helix (30˚ to 40˚)
- High Helix (45˚ to 60˚)
- Other
Clear

R Precision(μm)
-0.032～-0.059

-0.025～-0.047

-0.020～-0.038

-0.014～-0.028

-0.005 to 0.005

0～-20

0～-0.05

0～-0.030

0～-0.015

0～+0.04

±0.005

±0.01

±0.015

0.015～-0.015

±0.02

0.02～-0.02

0.025～-0.025

±0.03

±0.05

±20
Drawing

Clear

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