Art. 1893, 1898
1899, 1900, 900
Tap and Die Set
Instructions for use
Please read and follow these instructions to reach a proper threading and longer tool-life.
Taps and dies are tools of high precision. They are produced from high-quality alloy steel, heat
treated and tempered for a hardness of 58-61 HRC. Check the hardness of your workpiece before
starting thread-cutting by a regular machinist's file. In case the workpiece can be easily filed, you may
proceed with your thread-cutting.
Taps
(for internal threads)
x
To cut an internal thread, select a proper drill-size as per the table
shown below, the tap of the desired size and tap-wrench.
x
The proper hole-size is very important in the formation of good
threads. An oversized hole results in reduced thread-high an
undersized hole will overload the tap and will probably cause demage
of the tool or even the workpiece.
x
Secure the tap by the square in the tap-wrench
x
Fix the workpiece in a bench-vise or by using clamps and start
threading by turning the wrench in clockwise direction. Great care
must be taken to start the tap square to the hole. As the tap is turned
it bites into the metal and leads into the hole.
x
After the tap has been started, the metal-chips that flow into the flute
spaces must be broken to relieve pressure on the tap. This is
accomplished by reversing the tap-direction every 1/4 to 1/2
revolution depending on the tightness encountered. Providing
lubrication to the cutting edges while tapping will result in smoother
threads and longer tap-life.
x
Continue threading until the tap passes through the workpiece or it
reaches the bottom of the hole.
x
When tapping a blind hole (one that does not pass entirely through
the workpiece) take care in drilling to provide clearance at the bottom
for metal-chips and the starter-threads. These chamfered threads on
the end of the tap will not cut full threads.
