Spotting Drill Sizes




Automatic Drill Units, Pneumatic Drills, Multiple Spindle Drills


Spotting or Centering Drills are designed for centering work, making a starting hole for a larger drill and for chamfering.  The short flute and overall length of these type drills is very rigid to ensure precise spotting prior to drilling.  Use as large a drill diameter as is reasonable for the best results.



Size Decimal
Equiv.
Flute Length
inch
Overall Length
inch
1/8 .125 3/8 1-1/4
3/16 .1875 1/2 1-3/8
1/4 .250 5/8 1-1/2
5/16 .3125 5/8 1-1/2
3/8 .375 1 2
7/16 .4375 1 2
1/2 .500 1 2
9/16 .5625 1 2
5/8 .625 1-1/8 2-1/4
3/4 .750 1-1/8 2-1/4
7/8 .875 1-1/4 2-1/2
1 1.000 1-1/4 2-1/2
1-1/4 1.250 2 4
1-1/2 1.500 2-1/2 5
1-3/4 1.750 2-3/4 5-1/2




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AutoDrill can provide replacement drilling heads for Commander, Johnson, Ettco, Centerline Centroid and many more. Our prices make rebuilding Commander, Johnson, Ettco, Centerline Centroid and many other brand multiple spindle heads uneconomical. When you need a replacement head for Commander, Johnson, Ettco or Centerline Centroid multi-spindle drill or tapping heads call AutoDrill.


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