Python Wire Rope - Wesco Industries Ltd.

Wire Rope
Python ® UNI-4
4-strand crush- and rotation resistant
UNI-4
4 outer rope strands with fiber core
40 wire parallel strand construction
Complete rope is compacted resulting in oval shaped outer strands
increased surface area for better contact and durability
Main Applications:
Python ® UNI-4 was developed for ship cranes using bulk grabs to
unload coal, iron ore, and other abrasive bulk loads. Moreover, it
has shown it’s superior feature of crush resistance when used with
many other tough loads like logs which tends to easily crush normal
wire rope.
Because of it’s crush resistance it is also used on pile drivers and
other heavy duty construction equipment which requires a crush
resistant rope for multiple layer windings, even on smooth drums.
Rope Characteristic:
The geometry of ropes which have 4 outer strands results in a
somewhat rotation resistant characteristic. The main reason being
is that the physical lever arm length from the center of each strand
to the center of the rope becomes shorter the less outer strands a
rope has; such shorter lever arms results is less torque. Other
reasons why this rope is rotation resistant is the ‘regular lay’
construction coupled with a longer than normal rope lay length. On
the other hand such a construction is relatively stiff; not only
because of the 4-strands but also because of the longer lay length.
We do combat that in that we insert a fiber core into each of the 4
strands and that each strand has 40 wires. This is somewhat of
compromise between good crush resistance, attained rope
strength, and acceptable flexibility.
It’s rotation resistant characteristic is not all that great but is
sufficient for most ship crane applications.
Strength loss when used with a load bearing swivel is acceptable
but we strongly recommend to use this rope with a positioning
swivel only (not having roller- or ball bearings).
-24-
Do NOT use Python®
UNI-4 wire rope attached
to a swivel or have one or
both rope ends rotate
freely under load. Doing
so will result in a loss of
rope strength and
reduced fatigue life.
Block Twisting (Cabling)
will occur when used
exceeding certain lifting
heights. This is NOT a
non-rotating rope.
Call for advice