Presto Second Taps,
M2-M16
Quality High Speed Steel as you would expect from Presto Tools
Used for cutting internal threads,
Straight Flute full size
taps
used as machine
taps
Hand
tap
sets
for
tapping
in free cutting steel upto 800N/mm2.
Second taps assist in aligning and starting the tap into an untapped hole
They have a lead of 3-5 threads at 8 degrees per side and are tapered on one side.
They are the most popular and can be used for through holes, or blind holes where the thread does not need to go right to the bottom.