HALDER Main catalog standard parts Strana 943
Nabídka komerčních zákazníků **Nejlépe prodávané z HALDER Normalien
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Technical Appendix Thread Lockings MICRO-ENCAPSULATED THREAD LOCKINGS MICRO-ENCAPSULATED ADHESIVES FOR LOCKING AND SEALING IN COMPLIANCE WITH THE REQUIREMENTS OF DIN 267, PART 27 Micro-encapsulated systems maintain their strength for a period of approx. 4 years when stored under normal conditions in a dry climate at temperatures between 20 °C and 25 °C without major fluctuations. PROPERTIES PRECOTE® 80 Based on the system of Omni-Technik, preCOTE is a liquid plastics material including a hardening agent both of which are encapsulated into a thin polymer layer and embedded into a lacquer-type carrier system. PreCOTE is applied onto the Thread of screws yielding a dry and non-tacky safety coating which is ready for use at any time. The cured preCOTE material serves as a locking element for joints even when subject to highest dynamic transverse stress. This means that a loss of prestressing exceeding the settling rate will not occur. The settling rate depends on the material to be clamped and its surface roughness. Besides, a corrosion within threaded assemblies is avoided. Mounting is performed according to almost the same procedures as with uncoated mating threads. Only the friction coefficient of the thread may be increased in some cases and therefore has to be compensated for by a correction of the tightening torque. Threaded joints which are locked and sealed with preCOTE material can be released without any damage being done to the threads using normal hand tools. FUNCTION On assembly of Threaded parts which are coated with preCOTE material, the micro capsules are ruptured by pressure and/or shearing force. During this, the liquid plastics material and the hardening agent are set free and mixed with each other thus initiating a chemical reaction (polymerization). Due to the curing of the adhesive, a locking effect as well as an additional sealing effect is created. Product OT preCOTE 80 Product colour red Temperature range x1 - 50 °C up to + 170 °C Thread friction coefficient μ Thread 0,26 – 0,28 Function high-strength universal screw locking Test without prestressing CURING Curing will be initiated approx. 10 -15 minutes after mounting. Curing will be fully completed after 24 hours, however, it can be accelerated by temperature exposure. Test torques at room temperature Threads* Torques in Nm Min max. Mout min. Mout max. 1 1,8 4 10 6,5 10 26 55 M5 M6 M8 M 10 M8x1 M 10 x 1,25 1 1,5 3 5,5 M 12 M 14 M 16 M 12 x 1,25 · M 12 x 1,5 M 14 x 1,5 M 16 x 1,5 7,5 11 14 16 22 35 95 160 250 M 18 M 20 M 22 M 18 x 1,5 · M 18 x 2 M 20 x 1,5 · M 20 x 2 M 22 x 1,5 · M 22 x 2 19 22 30 40 45 65 335 500 800 M 24 M 27 M 30 M 24 x 2 M 27 x 2 M 30 x 2 36 42 49 90 120 165 1050 1300 1700 M 33 M 36 M 39 M 33 x 2 M 36 x 2 M 39 x 2 55 60 70 210 280 330 2400 3000 4000 Requirements applicable to threaded joints without prestressing with test nut. Tolerance of thread 6 H. *For nominal thread diameters < 5 mm and > 39 mm the testing torques have to be agreed upon between the supplier and the purchaser. 943 13
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