B251TX
Recommended Milling Conditions
Finishing
GR.5 Hardened Steel （ 38~48HRC ）
GR.6 Hardened Steel （ 48~56HRC ）
GR.7 Hardened Steel （ 56~68HRC ）
Work Material
130
120
90
Vc m/min
RPM (min-1) 40,000 40,000 40,000 30,000 30,000 20,000 18,000 15,000 13,000 11,000 10,000
Feed (mm/min)
RPM (min-1) 30,000 30,000 30,000 30,000 20,000 15,000 15,000 14,000 12,500 10,000
Feed (mm/min)
RPM (min-1) 30,000 30,000 30,000 30,000 30,000 15,000 14,000 14,000 10,000
Feed (mm/min)
Code No.
Dc
B251TX-R0.15 B251TX-R0.2 B251TX-R0.25 B251TX-R0.3 B251TX-R0.4 B251TX-R0.5 B251TX-R0.75 B251TX-R1 B251TX-R1.5 B251TX-R2 B251TX-R2.5 B251TX-R3
0.3 0.4 0.5 0.6 0.8
500 500 600 600 700 800
400 400 500 500 600 750 900
350 350 400 500 600 750 900
1
1.5
1,400 1,600 1,700 1,680 1,600 1,450
2 3 4 5 6
1,200 1,500 1,560 1,440 1,280
1,260 1,200 1,080 1,080
7,200 6,800 4,800
9,600 6,400
6,900
960
ap:0.02D
ap:0.02D
ap:0.02D
（ mm ）
ae:0.02D
ae:0.02D
ae:0.02D
High-speed machining
GR.5 Hardened Steel （ 38~48HRC ）
GR.6 Hardened Steel （ 48~56HRC ）
GR.7 Hardened Steel （ 56~68HRC ）
Work Material
200
175
120
Vc m/min
RPM (min-1) 50,000 50,000 50,000 50,000 50,000 50,000 46,000 35,000 23,000 17,500 14,000 11,500
Feed (mm/min)
RPM (min-1) 40,000 40,000 40,000 40,000 40,000 40,000 32,000 25,000 19,000 14,000 11,000 9,500
Feed (mm/min)
RPM (min-1) 40,000 40,000 40,000 40,000 40,000 32,000 25,000 20,000 13,000
Feed (mm/min)
Code No.
Dc
B251TX-R0.15 B251TX-R0.2 B251TX-R0.25 B251TX-R0.3 B251TX-R0.4 B251TX-R0.5 B251TX-R0.75 B251TX-R1 B251TX-R1.5 B251TX-R2 B251TX-R2.5 B251TX-R3
0.3 0.4 0.5 0.6 0.8
950
720 900
600 800 930
1,200 1,400 1,600 2,000 2,500 3,000 3,300 3,200 3,300 3,300 3,000
1,000 1,200 1,500 1,900 2,000 2,500 2,500 2,500 2,500 2,500
1,300 1,400 1,400 1,600 1,750 1,800 1,600 1,700 1,700
1
1.5
2 3 4 5 6
9,800 7,900 6,500
ap:0.02D
ap:0.02D
ap:0.02D
（ mm ）
ae:0.02D
ae:0.02D
ae:0.02D
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.
120
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