B257X
Recommended Milling Conditions
Slotting
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.2 Low-alloyed Steel （ ~24HRC ）
GR.9 Cast Iron
GR.1 Carbon Steel
Work Material
80
80
80
55
50
30
80
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
B257X-3 B257X-4 B257X-5 B257X-6 B257X-8 B257X-10 B257X-12 B257X-16 B257X-20
3 7,500 4 6,000 5 5,200 6 4,500 8 3,300 10 2,600 12 2,200 16 1,600 20 1,300
190 225 300 300 280 270 270 250 200
7,500 6,000 5,200 4,500 3,300 2,600 2,200 1,600 1,300
190 225 300 300 280 270 270 250 200
6,350 4,900 4,300 3,600 2,700 2,100 1,800 1,350 1,050
150 180 230 230 230 220 210 190 150
5,300 4,200 3,500 2,900 2,200 1,700 1,450 1,100
100 120 125 120 120 120 125 100
4,350 3,500 3,000 2,500 1,900 1,500 1,200
75 90
2,700 2,200 1,900 1,600 1,100
40 50 55 55 50 50 45 35 30
7,500 6,000 5,200 4,500 3,300 2,600 2,200 1,600 1,300
190 225 300 300 280 270 270 250 200
100 100 100
90 95 85 65
950 800 600 480
950 750
880
75
ap:0.5D
ap:0.5D
ap:0.5D
ap:0.5D
ap:0.5D
ap ： 0.05D
ap:0.5D
（ mm ）
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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