130
New Morrtork Nut
Visible check ensures correct torque applied
By Robert Morrison
The reliability of nuts and fasteners is vital. If used incorrectly they can be the fundamental cause of catastrophe.
If over-tightened they may shear under overload strain on the thread itself; if not tightened sufficiently then slackening
leads to equipment separation and failure.
The patented Morrtork nut allows a visible equipment can be significant factors. It co-efficient based calculations. It also stops
check to satisfy the operator that the correct makes great advances where physical errors any designed permutation being ignored, as
amount of torque has been applied to the may occur. Designers may calculate to the n- often happens in the field.
assembly. It further ensures that an th degree, but for the cold rain-swept person Using the Morrtork proper tightening
inspection process may be accomplished tightening the nut, the priority is inevitably to processes, such a cross-torquing, become a
quickly and accurately to avoid under- get the job done – so an easy assembly and simple calculation and physical
tightening and, by using a simple gauge, can simply checked system is a great advantage. measurement, taking into account the nib
check against over-tightening. Using a locking The patented Morrtork aims to set industry depth and the number of cycles required.
standards in This upholds gasket integrity.
responsible The Morrtork design has been tested, very
engineering. The successfully, with stainless steel, duplex and
science of everyday super-duplex, where there is a distinct
accurate bolt possibility of cold-welding occurring if
torquing is not over-torqued, even at relatively low settings.
much more than Stress erosion of these metals is also
sixty years old, with avoided.
the advent of the Under development at the moment is the
mechanism, such as a prevailing-torque, this comprehensive torque-wrench. The Morrtork use of Morrtork in erosion estimation in bolt
makes the Morrtork a ‘perfect’ nut, with fix- advances that science to a “cassetted” assemblies. A bolt assembly, utilising
and-forget possibilities. format, with the component itself relaying equipment presently being designed, can be
The concept behind the Morrtork is to take a the necessary information. ‘elongated’, and by comparative elongation,
proven component - the humble, but Accurate torquing of a normal nut-type the amount of erosion in a bolt assembly can
ubiquitous engineering nut - and make it requires highly specialised personnel and be estimated. This is done without
more user-friendly and efficient. It makes any equipment, with varying degrees of success disassembling the bolts. This means, for
maintenance program easier, bearing in mind and expense. Using the Morrtork involves example, that a 50-year-old bridge or other
the years of service such components less complications and costs. For example, structure could rapidly and easily be checked,
perform. slogging spanners used by unskilled labour with no disruption to traffic. Aerospace
The Morrtork utilises a precision-machined may be appropriate, yet the results can be assemblies could also be checked this way.
nib that, at the optimum torque value and visibly checked
taking into account the strength and ductility and inspected. The
of the material, allows a pre-determined full depth of the
collapse into itself to leave the bottom of the nut can be
nut flush with the fixed-to surface. engaged, unlike
A 45-degree ramp permits any inspector to flanged nuts. Not
check that the nut has not been over- all applied
tightened, using a simple precision gauge. tensioning is used
The Morrtork has special potential for in tightening. In unlubricated bolt assemblies Bolts in reinforced concrete (with all the
aerospace, where high technology alloys are approximately 85% of torque is used to chemical reactions which take place during
used, inspection is vital and components overcome friction, and only 15% available to construction) can easily be checked. Bolted
have to be regularly changed-out. Railways produce bolt load. The Morrtork helps ease assemblies in flanges may be checked
are another very important industry where the reckoning of this. without shutting down pipelines. This may
inspection is vital. Of course, there are many The Morrtork avoids the possibility of prove to be a huge advantage in many
other industry applications, apart from these pre-used, fatigued nuts being used, since it industries by pre-empting failure under a
two obvious examples, where joint security is will be obvious, by the state of the nib, if it is simple and cheap process.
vital and reliable time and cost efficient new. Equally, low quality or faulty bolting will More information about Mortork can be
inspection essential. shear before the nib will have collapsed. found at www.morrtork.co.uk.
The Morrtork is designed for easy manual The Morrtork concept allows coatings or Robert Morrison can be contacted at
use in physically awkward areas, where bad lubricants to be used in any permutation,
Robert@bonaccordmetal.co.uk or on
visibility and restrictive personal protection thus avoiding mistakes in complicated friction +44 1224 8778898
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