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8 2 2 5 1 L
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.
Please read and follow these instructions to reach a proper threading and Ionger tool-life.
TA P S ( F O R I N T E R N A L T H R E A D S )
To cut an internal thread, select a proper drill-size as per the table shown below, the tap of the desired
size, tap-wrench and cutting-oil.
The proper hole-size is very important in the formation of good threads. An oversized hole results in
reduced thread-hight, an undersized hole will overload the tap and will probably cause demage of the
tool or even the workpiece. Please refer to the table printed below concerning the correct size of drill.
Fix the workpiece in a bench-vise or by using clamps.
Secure the tap by the square in the tap-wrench and start threading by turning the wrench in clockwi-
se 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 Ieads into the hole. 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 lubrica-
tion to the cutting edges while tapping will result in smoother threads and Ionger tap-life.
Continue threading until the tap passes through the workpiece or it reaches the bottom of the hole.
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.
D I E S ( F O R E X T E R N A L T H R E A D S )
To cut an external thread, such as on a bolt, select the correct die for the rod, being threaded, the die-
stock and cutting-oil.
S W - S t a h l G m b H
A n d e r H a s e n j a g d 3
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D - 4 2 8 9 7 R e m s c h e i d
82251L_manual_de_en_75160_roh.indd 6
82251L_manual_de_en_75160_roh.indd 6
Te l e f o n : + 4 9 2 1 9 1 4 6 4 3 8 0
Fa x : + 4 9 2 1 9 1 4 6 4 3 8 4 0
i n f o @ s w s t a h l . d e
20.05.20 08:32
20.05.20 08:32
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