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DRILLS
DRILLS
278
www.kyocera-sgstool.com
FRACTIONAL
Hi-PerCarb
Series
141K 5D
Fractional
Hardness
Vc
(sfm)
Diameter (D
1
)
(inch)
1/8
3/16
1/4
3/8
1/2
5/8
3/4
K
GRAY CAST IRON
FERRITIC
ASTM A48: CLASS 20
SAE J431C: GRADE 1800
≤ 150 Bhn
or
≤ 80 HRb
450
RPM 13752
9168
6876
4584
3438
2750
2292
(360-540)
Fr
0.0049
0.0074
0.0099
0.0148
0.0198
0.0247
0.0297
Feed (ipm)
68
68
68
68
68
68
68
GRAY CAST IRON
PEARLITIC
ASTM A48: CLASS 30, 35, 40
SAE J431C: GRADE 3000
≤ 220 Bhn
or
≤ 19 HRc
375
RPM 11460
7640
5730
3820
2865
2292
1910
(300-450)
Fr
0.0039
0.0059
0.0079
0.0118
0.0157
0.0196
0.0236
Feed (ipm)
45
45
45
45
45
45
45
COMPACTED
GRAPHITE IRON
≤ 250 Bhn
or
≤ 25 HRc
325
RPM 9932
6621
4966
3311
2483
1986
1655
(260-390)
Fr
0.0039
0.0059
0.0079
0.0118
0.0157
0.0196
0.0236
Feed (ipm)
39
39
39
39
39
39
39
MALLEABLE CAST IRON
FERRITIC
ASTM A220: GRADE 40010
SAE J158: GRADE M4504
≤ 160 Bhn
or
≤ 3 HRc
450
RPM 13752
9168
6876
4584
3438
2750
2292
(360-540)
Fr
0.0049
0.0074
0.0099
0.0148
0.0198
0.0247
0.0297
Feed (ipm)
68
68
68
68
68
68
68
MALLEABLE CAST IRON
MARTENSITE
ASTM A220: GRADE 90001
SAE J158: GRADE M8501
≤ 320 Bhn
or
≤ 34 HRc
250
RPM 7640
5093
3820
2547
1910
1528
1273
(200-300)
Fr
0.0031
0.0047
0.0063
0.0094
0.0126
0.0157
0.0188
Feed (mm/
min)
24
24
24
24
24
24
24
Bhn (Brinell) HRc (Rockwell C) HRb (Rockwell B)
rpm = Vc x 3.82 / D
1
ipm = Fr x rpm
reduce speed and feed for materials harder than listed
refer to the KYOCERA SGS Tool Wizard
®
for complete technical information (www.kyocera-sgstool.com)