Cutting & Drilling Catalog - Bottom HSS Hand Taps - Straight Flute | K.L. Jack

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Bottom taps have a 1 to 1-1/2 thread chamfer and are used to make threads close to the bottom of a blind tapped hole. They are the final tap used to finish a hole after the initial threading work has been done using a Taper and/or Plug tap. Bottom taps should not be used to start holes due to high turning resistance and the likelihood of tap breakage.

High Speed Steel
Bright Surface Finish
For Hand or Machine Tapping
1 or 2 threads are chamfered
Use as secondary tap to run existing threads to bottom of hole