Machinery's Handbook, 31st Edition
Twist Drills
957
Table 12. British Standard Morse Taper-Shank Twist Drills and Core Drills — Standard Metric Sizes BS 328: Part 1:1959
Flute Length
Overall Length
Flute Length
Overall Length
Flute Length
Overall Length
Diameter
Diameter
Diameter
3.00 3.20 3.50 3.80 4.00 4.20 4.50 4.80 5.00 5.20 5.50 5.80 6.00 6.20 6.50 6.80 7.00 7.20 7.50 7.80 8.00 8.20 8.50 8.80 9.00 9.20 9.50 9.80
33 36 39
114 117 120
16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 24.25 24.50 24.75 25.00 25.25 25.50 25.75 26.00 26.25 26.50 26.75 27.00 27.25 27.50 27.75 28.00 28.25 28.50 28.75 29.00 29.25 29.50 29.75 30.00
30.25 30.50 30.75 31.00 31.25 31.50 31.75 32.00 32.50 33.00 33.50 34.00 34.50 35.00 35.50 36.00 36.50 37.00 37.50 38.00 38.50 39.00 39.50 40.00 40.50 41.00 41.50 42.00 42.50 43.00 43.50 44.00 44.50 45.00 45.50 46.00 46.50 47.00 47.50 48.00 48.50 49.00 49.50 50.00 50.50 51.00 52.00 53.00 54.00 55.00
125
223
180
301
130
228
43
123
47
128
185
306
135
233
52
133
185
334
57
138
140
238
190
339
63
144
145
243
69
150
195
344
150
248
75
156
200
349
155
253
81
162
205
354
155
276
10.00 10.20 10.50 10.80 11.00 11.20 11.50 11.80 12.00 12.20 12.50 12.80 13.00 13.20 13.50 13.80 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50
87
168
160
281
210
359
94
175
215
364
165
286
101
182
220
369
170
291
108
189
225
374
225
412
114
212
175
296
230
417
56.00 57.00 58.00 59.00 60.00
120
218
235
422
175
296
125
223
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