B258X
Recommended Milling Conditions
Side Milling
GR.2 Low-alloyed Steel （ ~24HRC ）
GR.3 Hi-alloyed Steel （ ~30HRC ）
GR.4 Hardened Steel （ 30~38HRC ）
GR.5 Hardened Steel （ 38~48HRC ）
GR.6 Hardened Steel （ 48~56HRC ）
GR.1 Carbon Steel
GR.9 Cast Iron
Work Material
85
85
75
70
60
30
85
Vc m/min
RPM (min-1)
Feed (mm/min)
RPM (min-1)
Feed (mm/min)
RPM (min-1)
Feed (mm/min)
RPM (min-1)
Feed (mm/min)
RPM (min-1)
Feed (mm/min)
RPM (min-1)
Feed (mm/min)
RPM (min-1)
Feed (mm/min)
Code No.
Dc
B258X-3 B258X-4 B258X-5 B258X-6 B258X-8 B258X-10 B258X-12 B258X-16 B258X-20
3 8,800 4 6,600 5 5,300 6 4,500 8 3,300 10 2,600 12 2,200 16 1,600 20 1,300
500 530 600 610 590 580 580 530 510
8,800 6,600 5,300 4,500 3,300 2,600 2,200 1,600 1,300
500 530 600 610 590 580 580 530 510
7,200 5,500 4,350 3,700 2,700 2,200 1,800 1,300 1,100
350 360 420 425 425 420 420 400 370
7,200 5,500 4,350 3,700 2,700 2,200 1,800 1,300 1,100
350 360 420 425 425 420 420 400 370
5,300 4,200 3,500 2,900 2,200 1,700 1,400 1,200
125 130 140 145 145 145 140 130 110
2,700 2,200 1,900 1,500 1,100
60 70 75 70 65 65 60 45 35
8,800 6,600 5,300 4,500 3,300 2,600 2,200 1,600 1,300
500 530 600 610 590 580 580 530 510
950 800 600 470
890
ap:1.5D
ap:1.5D
ap:1.5D
ap:1.5D
ap:1.5D
ap:1.5D
ap:1.5D
（ mm ）
ae:0.1D
ae:0.1D
ae:0.1D
ae:0.1D
ae:0.1D
ae:0.02D
ae:0.1D
1. Please work with good rigidity / high precision facilities and collet chuck. 2. Please choose proper cutting fluid.
3. The cutting data is reference value only. Please adjust it according to your real working conditions. 4. If RPM is lower the reference value, the Feed rate (fz) and RPM should be reduced by the same proportion. 5. If vibration occurs during cutting, please reduce cutting parameter.
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