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Eco Stud Brochure - July 2010
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Eco Stud Brochure - July 2010


For more information, contact Tomorrow People :

For more information, contact Tomorrow People :

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  • 1. EcoStud Easy to use, easy to check. Critical bolting made safer.
  • 2. Critical joints made simple EcoStud has been developed to combat fastener fatigue failures and leaking joints - a constant source of expensive problems. The EcoStud brings together into a single, integral unit a high quality fastener and an accurate tension controller. This unique combination brings verifiable quality right into the heart of the joint making process. The EcoStud indicates correct tension by a rotor on the end of the stud which turns freely when the stud is loose but locks to finger pressure at the correct stud tension. The fitter simply tightens the EcoStud until the rotor begins to grip, and stops tightening when the rotor locks to finger pressure. Finally, all the stud loads can be quickly verified by checking that all the rotors are still locked. 3 2 1 How it works The EcoStud indicates when a pre-set elongation, and thus load, is present in the stud. The rotor indicator (1) on the end of the EcoStud is normally free to 4 rotate in an air gap (2) which is accurately pre-set in our factory. In operation when the stud is being tightened, it elongates slightly causing the head of the gauge pin (3) to move towards the rotor. At the correct load in the stud the head of the gauge pin contacts and locks the rotor. When the rotor locks to light finger pressure the tightening is complete. Note the special annular tube around the gauge pin (4) is a patented feature which ensures the gauge length and hence load accuracy remains unaffected by the position of the nut along the stud. Frequently asked questions Does the nut have to be in a particular How do you set the air gap? position for EcoStud to work? We apply the required set working load No. The working nut face can be anywhere to the stud, lock the rotor in place under up to two diameters from the end of the stud load then, when the load is removed the without affecting the set load. correct air gap appears. Can you overload an EcoStud? How is EcoStud protected Tightening past the rotor lock point will eventually against corrosion? lead to yielding - as it will with any stud. Just stop The mechanism is protected by a tightening when the rotor locks and the EcoStud stainless steel cap with O-seal and ensures you have the correct preload. packed with a grease approved to NATO G-403. Does the hole reduce the strength of the stud? What is allowable temperature? It reduces the ultimate strength by a few The design of EcoStud automatically percent depending on stud diameter but compensates for temperature changes. fatigue strength, which is the key factor, is However for applications requiring long greatly improved by the correct preload term checking above 150˚C or below 0˚C provided by EcoStud. contact our technical department. If you have any other questions you would like to discuss please contact our Technical Department on 0114 251 9050.
  • 3. Variable Nut Position Variable nut position does not affect accuracy - A Safer Assembly Unlike other systems, the unique patented design of the EcoStud means it is not necessary to position the nut accurately on the threads. No need to waste time trying to position the nut in the right place, and no errors introduced because the nut is not positioned exactly. Using an EcoStud the nut can be positioned anywhere from the stud end to two diameters in, without affecting the accuracy. EcoStud makes a more reliable joint - simpler, quicker. EcoStud combats Tightening Accuracy see VDI 2230 -5% +5% EcoStud Fatigue Failures Stud preload is the key factor in preventing fatigue failure Hydraulic -15% +15% in joints. Correct preload in the stud ensures that the flange Tensioner itself absorbs nearly all of the vibration loading, leaving very little to fatigue the studs. Once the designer has selected the correct stud load EcoStud will ensure that it is -30% +30% Torque accurately reproduced on site. EcoStud gives an assembly Wrench preload accuracy of ± 5%, far better than torque tightening at ±30%, or hydraulic tensioning at ± 15%. EcoStud combats Gasket Leaks Gasketed and sealed pressure joints shrink and expand so good control of stud load is essential to prevent leaks. The simple EcoStud finger and thumb test provides a quick and effective check on stud preload at assembly and throughout the working life of the joint. Leaks can be stopped before they occur - a far cheaper and safer way than breaking down the joint or trying to stop a leak once a leakage path has developed.
  • 4. EcoStud technical data Min Diameter 24 mm or 1 inch standard. Smaller sizes refer to tech dept. Max Length Up to 5000 mm as standard Control Cap Stainless steel Rotor Stainless steel Gauge Pin 12.9 Carbon steel as standard Grease packing Calcium based grease to military spec. NATO G-403. Stud material EcoStud technology can be supplied fitted to any type of stud material Identification Marked in the top of the control cap Certification All normal testing and certifications available About Arnold Wragg Arnold Wragg Limited is a first level supplier of fasteners and turned parts to client requirements and recognised standards. AWL is part of the Specialist Technologies Aerospace Group, an international group with operations in UK, France and the USA, specialising in the supply management of aerospace components, parts and equipment. The group goal is to provide our customers with high quality products and service at all times. Our aim is to establish a working environment where the need for quality is fully recognised, understood and implemented across the organisation. We aim to be the first choice supplier for our customers. The company is approved to ISO9001:2000 and EN/AS9100 quality assurance standards. It is an approved supplier to Rolls Royce plc, BAE Systems and GKN Aerospace. Arnold Wragg Ltd Parkway One Business Centre Parkway Drive Sheffield, South Yorkshire S9 4WU UK Tel: 0114 251 9050 Fax: 0114 244 6635 Email: Website: