Page 8 - ASF Katalog 2018 en

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ANCHORAGES

Thread rolling Advantages
All threads, especially upset thread sections, are rolled by us in our • Rolled threads have a high profile accuracy.
plant. We refrain from peeling the surface prior to rolling. That results in
no interruptions to the fibres, which leads to additional work hardening • Thread rolling is akin to a cold-forming operation.
of the surface. This increases the strength of the steel and the yield stress at
the root and flanks of the thread, which improves the
Any length of thread is possible on a solid bar, even over the entire bar concentric transfer of anchor forces via the thread.
on request. Both metric and inch threads can be supplied. The use of
inch threads and the associated coarser thread form results in simpler • The root and flanks of a rolled thread are particularly smooth
and faster progress on site. and therefore exhibit good durability in the case of dynamic
loads.
We guarantee high-quality threads and fast fabrication.
• In contrast to machined threads, the fibres in the steel are
not interrupted in rolled or hot-rolled threads.

• Nuts, couplers and turnbuckles for round steel tie rods with
rolled threads do not necessarily have to have a rolled thread
Rolled thread as well because internal threads are always subjected to
lower stresses than external threads. Hoop tension forces are
Material displaced
upwards Prepared surface mobilised when internal threads are loaded and these support
the thread. Therefore, combining rolled external threads on
Prepared area Material displaced anchors with machined internal threads in nuts and
downwards turnbuckles does not represent a problem.

Thread O.D. Solid steel bar dia. prior to preparation After rolling the thread, the outside diameter of the thread is larger

than the diameter of the original steel bar. Therefore, the diameter,
or upset diameter, of a round steel tie rod with a rolled thread can be
smaller than that of an anchor with a machined thread for the same
load-carrying capacity.
Machined thread

Rolling or production fibres

Thread O.D. Solid steel bar dia. = thread O.D.

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