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DRILLS
DRILLS
326
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FRACTIONAL
Combined Drill & Countersink
Series
301
Fractional
Hardness
Vc
(sfm)
Diameter (D
1
)
(inch)
1/32
5/64
1/8
3/16
7/32
P
CARBON STEELS
1018, 1040, 1080, 1090,
10L50, 1140, 1212,
12L15, 1525, 1536
≤ 175 Bhn
or
≤ 7 HRc
265
RPM
8098
5399
3239
2314
2025
(212-318)
Fr
0.00068
0.0010
0.0017
0.0024
0.0027
Feed (ipm)
5.5
5.5
5.5
5.5
5.5
≤ 300 Bhn
or
≤ 32 HRc
125
RPM
3820
2547
1528
1091
955
(100-150)
Fr
0.00065
0.0010
0.0016
0.0023
0.0026
Feed (ipm)
2.5
2.5
2.5
2.5
2.5
≤ 425 Bhn
or
≤ 45 HRc
85
RPM
2598
1732
1039
742
649
(68-102)
Fr
0.00038
0.0006
0.0010
0.0013
0.0015
Feed (ipm)
1.0
1.0
1.0
1.0
1.0
ALLOY STEELS
4140, 4150, 4320, 5120,
5150, 8630, 86L20, 50100
≤ 275 Bhn
or
≤ 28 HRc
230
RPM
7029
4686
2812
2008
1757
(184-276)
Fr
0.00064
0.0010
0.0016
0.0022
0.0026
Feed (ipm)
4.5
4.5
4.5
4.5
4.5
≤ 375 Bhn
or
≤ 40 HRc
145
RPM
4431
2954
1772
1266
1108
(116-174)
Fr
0.00059
0.0009
0.0015
0.0021
0.0023
Feed (ipm)
2.6
2.6
2.6
2.6
2.6
≤ 450 Bhn
or
≤ 48 HRc
60
RPM
1834
1222
733
524
458
(48-72)
Fr
0.00027
0.0004
0.0007
0.0010
0.0011
Feed (ipm)
0.5
0.5
0.5
0.5
0.5
H
TOOL STEELS
A2, D2, H13, L2, M2,
P20, S7, T15, W2
≤ 250 Bhn
or
≤ 24 HRc
85
RPM
2598
1732
1039
742
649
(68-102)
Fr
0.00035
0.0005
0.0009
0.0012
0.0014
Feed (ipm)
0.9
0.9
0.9
0.9
0.9
≤ 375 Bhn
or
≤ 40 HRc
55
RPM
1681
1121
672
480
420
(44-66)
Fr
0.00016
0.0002
0.0004
0.0006
0.0006
Feed (ipm)
0.3
0.3
0.3
0.3
0.3
≤ 475 Bhn
or
≤ 50 HRc
40
RPM
1222
815
489
349
306
(32-48)
Fr
0.00016
0.0002
0.0004
0.0006
0.0007
Feed (ipm)
0.2
0.2
0.2
0.2
0.2
K
CAST IRONS
Gray, Malleable,
Ductile
≤ 220 Bhn
or
≤ 19 HRc
280
RPM
8557
5705
3423
2445
2139
(224-336)
Fr
0.00084
0.0013
0.0021
0.0029
0.0034
Feed (ipm)
7.2
7.2
7.2
7.2
7.2
≤ 330 Bhn
or
≤ 36 HRc
250
RPM
7640
5093
3056
2183
1910
(200-300)
Fr
0.00084
0.0013
0.0021
0.0029
0.0034
Feed (ipm)
6.4
6.4
6.4
6.4
6.4
M
STAINLESS STEELS
(FREE MACHINING)
303, 416, 420F, 430F 440F
≤ 250 Bhn
or
≤ 24 HRc0
210
RPM
6418
4278
2567
1834
1604
(168-252)
Fr
0.00048
0.0007
0.0012
0.0017
0.0019
Feed (ipm)
3.1
3.1
3.1
3.1
3.1
≤ 330 Bhn
or
≤ 36 HRc
110
RPM
3362
2241
1345
960
840
(88-132)
Fr
0.00028
0.0004
0.0007
0.0010
0.0011
Feed (ipm)
0.9
0.9
0.9
0.9
0.9
STAINLESS STEELS
(DIFFICULT)
304, 316, 321, 13-8 PH,
15-5PH, 17-4 PH,
Custom 450
≤ 275 Bhn
or
≤ 28 HRc
65
RPM
1986
1324
795
568
497
(52-78)
Fr
0.00036
0.0005
0.0009
0.0013
0.0014
Feed (ipm)
0.7
0.7
0.7
0.7
0.7
≤ 375 Bhn
or
≤ 40 HRc
55
RPM
1681
1121
672
480
420
(44-66)
Fr
0.00032
0.0005
0.0008
0.0011
0.0013
Feed (ipm)
0.5
0.5
0.5
0.5
0.5
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