These are National Special Taps (NS) and can be difficult to find.

We purchase in quanity so are able to offer them at the reasonable price of $12 each.

 

Click to Order

Click to Order

Suggested tap drill sizes

1/4 - 32 NEF #2 drill for 71% thread
7/32 drill for 77% thread

10 - 40 NS #19 drill for 74% thread