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Thread tools \ Hand tap UNC/UNF

Female thread creation: Thread forming (thread tapping)

In contrast to tapping, where sections are cut out of the material, the process of thread forming does
not involve cutting. The material is made to fl ow through the polygon shape of the thread former. The
fi bre pattern is not interrupted.

Advantages: Disadvantages:
 Very high working speed and process reliability  Higher torque
 Very high surface quality  Special pre-drilling diameter with tight
 One tool for through hole and blind hole tolerance
 No clamping problems  Incomplete moulding of cores (claw)
 Higher thread strength  Minimum expansion of tool must be ensured
 Tools are easier to use  Regrinding not possible
 Long service life, less breakage  Lubrication essential
 Deep threads  Where used in the food or medicine industries,
there is a risk of germ build-up in the area of
the moulding recess.

Thread forming — the process

Process:
In contrast to tapping, where sections are cut out of the material, thread forming is a non-cutting, pressure forming procedure.
Advantages:
 No chip formation
 Up to 30% higher surface quality than with thread cutting
 Up to 40% higher processing speed than with thread cutting
 Threads in through holes and blind holes can be produced with the same tool
 Wide range of materials processable
 Cutting of thread eliminated
 Thread pitch and thread angle errors as with cut threads eliminated
 Shaped threads have higher strength owing to non-continuous cut
Requirements: For all shapeable materials with elongation >10 %.

unlike with screw tapping, in thread forming the
thread is produced by deforming the material. the 1 2
screw-shaped, polygonal, threaded part of the tool
is “screwed in” to the pre-drilled workpiece. It is
fed in evenly to match the target thread pitch. the
thread profi le penetrates the workpiece gradually 3
via the initial cut, causing it to fl ow and deform
plastically.

4 5

① workpiece ② tool ③ pre-drill diameter
④ run-in ⑤ guide part
h For more detailed information and explanations, refer to the technical manual.

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com
Availability subject to country specific rules and regulations. 220

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