PRODUCTS
ThermoNut adds security to joint
Have you ever thought about how much stretch is being put into a stud when you tighten it down onto a joint?
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resistance and enhanced security to the toughest environments. The R4-10 is available in low minimum order quantities and features varied strength options to meets customers’ application
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requirements. Product manager Manan Patel adds: “The new R4-10 is designed to withstand the toughest environments and provide enhancements to applications needing an upgraded latching system.”
he number of turns of the nut might fool you into thinking you were putting quite a lot of stretch into it, some millimetres at least, explains John Hirst of Enerfast Ltd. In fact you are mainly pulling up the joint and squashing a gasket. In reality there is only a very small elongation of the stud. For example take a typical flange 75mm thick then the studs themselves will only have a stretch of about 0.2mm – about the
thickness of a coat of paint. The loss of just 0.2mm in the joint, though, can reduce the load to zero. A situation this unpredictable, which is not uncommon particularly on hot joints, leads often to high maintenance costs when joints have to be remade. In the worst situation of course it can lead to leaks of dangerous chemicals. There can be many causes for this loss of elongation such as paint and zinc coatings deteriorating but the most serious one is
the effect of temperature on a joint. Basically a joint going through temperature cycling expands and contracts but the gasket never quite gets back to its original size i.e. hysteresis is taking place. This size loss leads to load loss in the studs and then quickly ensuing leakage past the gasket. The ThermoNut has been developed to deal with this situation. It is a high temperature donut shaped spring that fits under the nut,
adding ‘springiness’ into the joint. This added extra spring changes the joint so that it is not relying solely on the tiny elongation of the stud to keep the joint intact. ThermoNuts are made from Inconel grades used in jet turbine engines so are able to operate up to 450°C and are resistant to
creep and corrosion. They can be fitted to each end or one end only of the fastener depending on the application. Standard size range is M12 (½ inch) to M76 (3 inch) fasteners.
Meeting the demands of the marine industry Southco® says that its stainless steel R4-10 rotary latch brings corrosion-resistant durability
to a proven latching solution suitable for vandal-proof and watertight storage areas.
onstructed of 304 grade stainless steel, the R4-10 meets marine requirements in performance and salt spray. The concealed latch allows flexible styling of the storage compartment area and accommodates misalignment between the latch and striker bolt. A double stage latching option provides additional security and functionality. Stainless steel actuators and cables are available for multipoint latching solutions, and the new 316 grade stainless steel AC-M1 actuator delivers corrosion
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