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Ties manufactured under Patent No WO0213990A1, (exclusive to Thor Helical products), and designed
by the originators of helical-fin fixing technology.
These ties are engineered using precise pitch twisting technology, which delivers a device having a pitch consistency
tolerance of within 0.5%, when measured along any probate pitch of the wire. The accurately twisted device forms a
precise helical seating groove in the host building materials into which it is hammered to ease driving and to provide
a consistent full interlock performance.
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The “pitch” is formed as part of the profile roll-forming process where the wire is passed
through a specially designed die which imparts a rotational force creating the precise pitch.
The original Ollises profiles maintained a constant core size and increased the size of the fins for larger outside
diameters, in comparison Thor wires maintain the core/helical fin dimensional ratio, as the diameter increases the
core is proportionally increased, providing a greatly improved buckling resistance in compression and an obvious
increase in tensile capacity.
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“Precise Pitch” Twisting technology ensures accurate tracking whilst a tie is being driven
across a cavity reducing the tendency for misalignment with far leaf pilot holes. Compression forces are more centrally
transmitted through the core along the whole length of the tie further improving buckling resistance.
Download: PDF Brochure
ORIGINAL & CURRENT ALTERNATIVES
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Ties manufactured under the originators early patents and designs.
These wires have a published pitch variation tolerance of +/- 2mm on rotation. The leading section forms a helical
seating groove, which, in softer materials, may be widened by the remainder of the penetrating helix and which, in
very hard materials may stress and distort the helical fins in an effort to follow the path cut by the leading end.
Driving maybe more difficult, ties may bend and/or the helical interlocking seating groove may be highly distorted
and damaged.
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Having a uniform central core the O.D. was varied by extending the width of the “fin”. The helical
pitch is introduced through a clamping and twisting process where one end of the wire is clamped in a fixed position and
the other end clamped and twisted, hence the variations in pitch as the “twisting forces” work their way along the length
of the wire.
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