XXL Pulley

When we wanted to test our tripod to 12,000 pounds, we simply could not find
a suitable pulley on the market to help us with this test.  The solution, make our own!  That effort
resulted in our pulley 1.0, which worked, but needed some improvements.  To the left you will
see our version 2.0.  The biggest change is the continuous becket at the bottom.  This allows
for termination of the rope at any location, thus improving the balance of the load on the pulley.
Other features include double sealed roller bearings.  This decision was a result of the fact that
when we used a commercial pulley with sleeve bearings on a change of direction and only a
1400 pound load, we ruined it!  We did not want to spare any expense in making a piece of
equipment of which we could be proud to produce.  In addition, when the pulley is being
assembled, each unit is individually shimmed so that the sides of each pulley will not rub
the frame.  If any maintenance is required, the shaft can be removed by pulling the cotter pin
at one end.  However, please consult with us before this attempt is made!

The hook has a working load rating of 10,000 pounds with a 4:1 safety ratio.  Rope that is either
1/2 inch or 5/8 inch can be used.  The pulley set can be rigged for ratios from 2:1 up to 10:1.
  To access a PDF with suggested configurations for each ratio, click:  Pulley Rigging Suggestions  

The price of our pulley set is $936 for the pair.
To order, download our order form and either e-mail or fax:  Häst Order Form

On 29 November 2017, our version 1.0 pulley was subjected to a
destructive load test at Mazzella Lifting Technologies.  You can
see the results to the right.  While there were no visible cracks or
other damage noted to the aluminum parts that we produce, the
point of failure was obvious, with the very heavy steel hook
opening up.  This was quite the surprise.  Even the 1/2 inch
nylon rope did not appear damaged.

The amount of load that resulted in this failure was measured at
48,391 pounds.  Even though the hook to the right was the point
of failure, the hook at the far end also underwent a certain amount
of plastic deformation that resulted in permanent damage.

Bottom line:  We feel confident in putting a 10,000 WLL rating
on this pulley with a 4:1 safety ration.  To view the test
report, simply click on:  Pulley Load Test
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