#10 - 24 Bottoming Tap, High Speed Steel - National Coarse Thread
Model #: TAB-10-24
Price: $2.40
Description: #10-24 HS Bottoming Tap 0300-0241
- Thread Diameter: #10
 - Threads per Inch: 24
 - High Speed Steel.
 - Ground Thread.
 - Recommended Drill Size: #25
 
Bottoming taps have 1 to 1-1/2 threads of lead, for threading close to the bottom of a blind hole.  
Please note that not all bottoming taps are flattened at the end.  
Some manufacturers leave a point that you may have to grind off if going very close to the bottom of a hole.