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Drill

The sraight shank is the most usual style on modern drill bits, by number manufactured. The whole of the drill bit, shaft and shank, is usually of the same diameter. It is held usually in a three-jaw drill chuck. Bits of diameter too small to grip firmly can have straight shanks of larger diameter than the drill, which can be held firmly in a standard size collet or chuck. Large drill bits can have straight shanks narrower than the drill diameter so that they can be fitted in chucks not able to chuck the full diameter. Such a drill bit is called a reduced-shank or blacksmith’s drill. For example, this allows a 1/2″ bit to be used in a pistol-grip drill’s 3/8″ chuck. One particular type of reduced-shank drill bits are Silver & Deming(S&D) bits, whose sets run from 9/16″ to 1-1/2″ drill body diameter with a standard 1/2″ reduced shank for all. This allows drill presses with 1/2″ chucks to run the larger drills. S&D bits are 6″ long with a 3″ flute length.

  • Easy to centerless grind or turn on a lathe
  • Minimum of turning or grinding needed if the drill bit is made from appropriately sized round bar stock
  • Can be held in a standard drill chuck, which must be tightened—only friction prevents slipping
  • Can also be held in a collet chuck (which must be tightened), particularly for smaller sizes
  • Very accurate centering
  • Torque transmission limited by slipping of cylindrical shank

Application:

Steel, Stainless Steel, Cast Iron, Aluminum, and High-Temp Alloys • 3 x D

 

mm SHORT* REGULAR* LONG**
Ø DIN 6535 ~3 x D ~5 x D ~8 x D
D1 min D1 max D LS min L3 L4 L L3 L4 L L3 L4
1,000 1,400 4 28 58 7 5 58 9 6 58 12 10
1,401 1,900 4 28 58 9 6 58 12 9 58 18 15
1,901 2,300 4 28 58 13 9 58 18 14 66 26 22
2,301 2,990 4 28 58 17 12 58 22 17 66 30 25
3,000 3,750 6 36 62 20 14 66 28 23 78 40 33
3,751 4,750 6 36 66 24 17 74 36 29 87 49 41
4,751 6,000 6 36 66 28 20 82 44 35 94 56 48
6,001 7,000 8 36 79 34 24 91 53 43 105 67 57
7,001 8,000 8 36 79 41 29 91 53 43 110 72 61
8,001 10,000 10 40 89 47 35 103 61 49 122 80 68
10,001 12,000 12 45 102 55 40 118 71 56 141 94 79
12,001 14,000 14 45 107 60 43 124 77 60 155 108 91
14,001 16,000 16 48 115 65 45 133 83 63 171 121 101
16,001 18,000 18 48 123 73 51 143 93 71 185 135 113
18,001 20,000 20 50 131 79 55 153 101 77 200 148 124
20,001 22,000 20 50 141 86 60 167 112 85 217 162 136
22,001 25,000 25 56 153 95 65 184 126 98 238 180 150
* D1 < 20mm to DIN 6537K
D1 > 20mm to factory standard
**To factory standard
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