Spotting Drill Sizes
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 |
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.
AutoDrill
1221 US Hwy 22
Lebanon, NJ 08833
Ph. 800-871-5022
Intl.Ph. 01-908-542-0244
Fax: 908-542-0242
