Machinery's Handbook, 31st Edition
950
Twist Drills Table 5. American National Taper-Shank Twist Drills Fractional and Metric Sizes ANSI/ASME B94.11M-1993 Table 5. (Continued) American National Taper-Shank Twist Drills
Drill Diameter, D
Regular Shank
Larger or Smaller Shank a Flute Length Overall Length
Equivalent
Flute Length Overall Length Morse Taper No. F L Inch mm Inch mm
Morse Taper No.
F
L
Frac- tion
Decimal Inch
mm
mm
Inch
mm
Inch
mm
340 21 1 ⁄ 8 340 21 1 ⁄ 8 340 21 1 ⁄ 8 356 21 3 ⁄ 4 356 21 3 ⁄ 4 356 21 3 ⁄ 4 356 21 3 ⁄ 4 356 21 3 ⁄ 4 371 24 1 ⁄ 2 371 24 1 ⁄ 2 371 24 1 ⁄ 2 394 25 1 ⁄ 2
537 537 537 552 552 552 552 552 622 622 622 648
… … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … …
72.00 2.8346 72.000 73.00 2.8740 73.000
5 5 5 5 5 5 5 5 6 6 6 6
13 3 ⁄ 8 13 3 ⁄ 8 13 3 ⁄ 8
2.8750 73.025
2 7 ⁄ 8
74.00 2.9134 74.000
14 14 14 14 14
2.9375 74.612
2 15 ⁄ 16
75.00 2.9528 75.000 76.00 2.9921 76.000 77.00 3.0315 77.000 78.00 3.0709 78.000 3.0000 76.200
3
5 5 5 5
362 22 362 22 362 22 387 23 413 24
559 559 559 584 610
14 5 ⁄ 8 14 5 ⁄ 8 14 5 ⁄ 8 15 1 ⁄ 2
14 1 ⁄ 4 14 1 ⁄ 4 14 1 ⁄ 4 15 1 ⁄ 4 16 1 ⁄ 4
3.1250 79.375 3.2500 82.550
3 1 ⁄ 8 3 1 ⁄ 4 3 1 ⁄ 2
3.5000 88.900 … … … … … 5
a Larger or smaller than regular shank. Table 6. American National Standard Combined Drills and Countersinks — Plain and Bell Types ANSI/ASME B94.11M-1993 PLAIN TYPE BELL TYPE
120°
D
D
60° A L
60° A L
E
C
C
Plain Type
Body Diameter
Drill Diameter
Drill Length
Overall Length
A
D
C
L
Size Designation
Inches
Millimeters
Inches
Millimeters
Inches
Millimeters
Inches Millimeters
3.18 3.18 3.18 4.76
.025
0.64 0.79 1.19 1.98 2.78 3.18 4.76 5.56 6.35 7.94
.030 .038
0.76 0.97 1.19 1.98 2.78 3.18 4.76 5.56 6.35 7.94
29 29 32 48 51 54 70 76 83 89
00
1 1 ⁄ 8 1 1 ⁄ 8 1 1 ⁄ 4 1 7 ⁄ 8 2 1 ⁄ 8 2 3 ⁄ 4 2 3 1 ⁄ 4 3 1 ⁄ 2 3
1 ⁄ 8 1 ⁄ 8 1 ⁄ 8
0 1 2 3 4 5 6 7 8
1 ⁄ 32 3 ⁄ 64 5 ⁄ 64 7 ⁄ 64
3 ⁄ 64 5 ⁄ 64 7 ⁄ 64
3 ⁄ 16
6.35 7.94 11.11 12.70 15.88 19.05
1 ⁄ 4
5 ⁄ 16 7 ⁄ 16
1 ⁄ 8
1 ⁄ 8
3 ⁄ 16 7 ⁄ 32
3 ⁄ 16 7 ⁄ 32
1 ⁄ 2 5 ⁄ 8 3 ⁄ 4
1 ⁄ 4
1 ⁄ 4
5 ⁄ 16
5 ⁄ 16
Bell Type
Body Diameter
Drill Diameter
Bell Diameter
Drill Length
Overall Length
A
D
E
C
L
Size Designation
Inches
mm
Inches
mm 1.19 1.59 2.38 2.78 3.97 4.76 5.56 6.35
Inches
mm 2.5 3.8 5.1
Inches
mm 1.19 1.59 2.38 2.78 3.97 4.76 5.56 6.35
Inches
mm
3.18 4.76 6.35 7.94
0.10 0.15 0.20 0.25 0.35 0.40 0.50 0.60
32 48 51 54 70 76 83 89
11 12 13 14 15 16 17 18
1 1 ⁄ 4 1 7 ⁄ 8 2 1 ⁄ 8 2 3 ⁄ 4 2 3 1 ⁄ 4 3 1 ⁄ 2 3
1 ⁄ 8
3 ⁄ 64 1 ⁄ 16 3 ⁄ 32 7 ⁄ 64 5 ⁄ 32 3 ⁄ 16 7 ⁄ 32
3 ⁄ 64 1 ⁄ 16 3 ⁄ 32 7 ⁄ 64 5 ⁄ 32 3 ⁄ 16 7 ⁄ 32
3 ⁄ 16
1 ⁄ 4
6.4 8.9
5 ⁄ 16 7 ⁄ 16
11.11 12.70 15.88 19.05
10.2 12.7 15.2
1 ⁄ 2 5 ⁄ 8 3 ⁄ 4
1 ⁄ 4
1 ⁄ 4
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